summaryrefslogtreecommitdiff
path: root/src/target/cortex_a.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/target/cortex_a.c')
-rw-r--r--src/target/cortex_a.c2319
1 files changed, 2319 insertions, 0 deletions
diff --git a/src/target/cortex_a.c b/src/target/cortex_a.c
new file mode 100644
index 00000000..82f719ad
--- /dev/null
+++ b/src/target/cortex_a.c
@@ -0,0 +1,2319 @@
+/***************************************************************************
+ * Copyright (C) 2005 by Dominic Rath *
+ * Dominic.Rath@gmx.de *
+ * *
+ * Copyright (C) 2006 by Magnus Lundin *
+ * lundin@mlu.mine.nu *
+ * *
+ * Copyright (C) 2008 by Spencer Oliver *
+ * spen@spen-soft.co.uk *
+ * *
+ * Copyright (C) 2009 by Dirk Behme *
+ * dirk.behme@gmail.com - copy from cortex_m3 *
+ * *
+ * Copyright (C) 2010 Øyvind Harboe *
+ * oyvind.harboe@zylin.com *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 2 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, write to the *
+ * Free Software Foundation, Inc., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ * *
+ * Cortex-A8(tm) TRM, ARM DDI 0344H *
+ * Cortex-A9(tm) TRM, ARM DDI 0407F *
+ * *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "breakpoints.h"
+#include "cortex_a.h"
+#include "register.h"
+#include "target_request.h"
+#include "target_type.h"
+#include "arm_opcodes.h"
+#include <helper/time_support.h>
+
+static int cortex_a8_poll(struct target *target);
+static int cortex_a8_debug_entry(struct target *target);
+static int cortex_a8_restore_context(struct target *target, bool bpwp);
+static int cortex_a8_set_breakpoint(struct target *target,
+ struct breakpoint *breakpoint, uint8_t matchmode);
+static int cortex_a8_unset_breakpoint(struct target *target,
+ struct breakpoint *breakpoint);
+static int cortex_a8_dap_read_coreregister_u32(struct target *target,
+ uint32_t *value, int regnum);
+static int cortex_a8_dap_write_coreregister_u32(struct target *target,
+ uint32_t value, int regnum);
+static int cortex_a8_mmu(struct target *target, int *enabled);
+static int cortex_a8_virt2phys(struct target *target,
+ uint32_t virt, uint32_t *phys);
+static int cortex_a8_disable_mmu_caches(struct target *target, int mmu,
+ int d_u_cache, int i_cache);
+static int cortex_a8_enable_mmu_caches(struct target *target, int mmu,
+ int d_u_cache, int i_cache);
+static int cortex_a8_get_ttb(struct target *target, uint32_t *result);
+
+
+/*
+ * FIXME do topology discovery using the ROM; don't
+ * assume this is an OMAP3. Also, allow for multiple ARMv7-A
+ * cores, with different AP numbering ... don't use a #define
+ * for these numbers, use per-core armv7a state.
+ */
+#define swjdp_memoryap 0
+#define swjdp_debugap 1
+
+/*
+ * Cortex-A8 Basic debug access, very low level assumes state is saved
+ */
+static int cortex_a8_init_debug_access(struct target *target)
+{
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+ int retval;
+ uint32_t dummy;
+
+ LOG_DEBUG(" ");
+
+ /* Unlocking the debug registers for modification */
+ /* The debugport might be uninitialised so try twice */
+ retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
+ if (retval != ERROR_OK)
+ {
+ /* try again */
+ retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
+ if (retval == ERROR_OK)
+ {
+ LOG_USER("Locking debug access failed on first, but succeeded on second try.");
+ }
+ }
+ if (retval != ERROR_OK)
+ return retval;
+ /* Clear Sticky Power Down status Bit in PRSR to enable access to
+ the registers in the Core Power Domain */
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_PRSR, &dummy);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* Enabling of instruction execution in debug mode is done in debug_entry code */
+
+ /* Resync breakpoint registers */
+
+ /* Since this is likely called from init or reset, update target state information*/
+ return cortex_a8_poll(target);
+}
+
+/* To reduce needless round-trips, pass in a pointer to the current
+ * DSCR value. Initialize it to zero if you just need to know the
+ * value on return from this function; or DSCR_INSTR_COMP if you
+ * happen to know that no instruction is pending.
+ */
+static int cortex_a8_exec_opcode(struct target *target,
+ uint32_t opcode, uint32_t *dscr_p)
+{
+ uint32_t dscr;
+ int retval;
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+
+ dscr = dscr_p ? *dscr_p : 0;
+
+ LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
+
+ /* Wait for InstrCompl bit to be set */
+ long long then = timeval_ms();
+ while ((dscr & DSCR_INSTR_COMP) == 0)
+ {
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ {
+ LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode);
+ return retval;
+ }
+ if (timeval_ms() > then + 1000)
+ {
+ LOG_ERROR("Timeout waiting for cortex_a8_exec_opcode");
+ return ERROR_FAIL;
+ }
+ }
+
+ retval = mem_ap_sel_write_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_ITR, opcode);
+ if (retval != ERROR_OK)
+ return retval;
+
+ then = timeval_ms();
+ do
+ {
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ {
+ LOG_ERROR("Could not read DSCR register");
+ return retval;
+ }
+ if (timeval_ms() > then + 1000)
+ {
+ LOG_ERROR("Timeout waiting for cortex_a8_exec_opcode");
+ return ERROR_FAIL;
+ }
+ }
+ while ((dscr & DSCR_INSTR_COMP) == 0); /* Wait for InstrCompl bit to be set */
+
+ if (dscr_p)
+ *dscr_p = dscr;
+
+ return retval;
+}
+
+/**************************************************************************
+Read core register with very few exec_opcode, fast but needs work_area.
+This can cause problems with MMU active.
+**************************************************************************/
+static int cortex_a8_read_regs_through_mem(struct target *target, uint32_t address,
+ uint32_t * regfile)
+{
+ int retval = ERROR_OK;
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+
+ retval = cortex_a8_dap_read_coreregister_u32(target, regfile, 0);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_dap_write_coreregister_u32(target, address, 0);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_STMIA(0, 0xFFFE, 0, 0), NULL);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = mem_ap_sel_read_buf_u32(swjdp, swjdp_memoryap,
+ (uint8_t *)(&regfile[1]), 4*15, address);
+
+ return retval;
+}
+
+static int cortex_a8_dap_read_coreregister_u32(struct target *target,
+ uint32_t *value, int regnum)
+{
+ int retval = ERROR_OK;
+ uint8_t reg = regnum&0xFF;
+ uint32_t dscr = 0;
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+
+ if (reg > 17)
+ return retval;
+
+ if (reg < 15)
+ {
+ /* Rn to DCCTX, "MCR p14, 0, Rn, c0, c5, 0" 0xEE00nE15 */
+ retval = cortex_a8_exec_opcode(target,
+ ARMV4_5_MCR(14, 0, reg, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ else if (reg == 15)
+ {
+ /* "MOV r0, r15"; then move r0 to DCCTX */
+ retval = cortex_a8_exec_opcode(target, 0xE1A0000F, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_exec_opcode(target,
+ ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ else
+ {
+ /* "MRS r0, CPSR" or "MRS r0, SPSR"
+ * then move r0 to DCCTX
+ */
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_MRS(0, reg & 1), &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_exec_opcode(target,
+ ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+
+ /* Wait for DTRRXfull then read DTRRTX */
+ long long then = timeval_ms();
+ while ((dscr & DSCR_DTR_TX_FULL) == 0)
+ {
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ if (timeval_ms() > then + 1000)
+ {
+ LOG_ERROR("Timeout waiting for cortex_a8_exec_opcode");
+ return ERROR_FAIL;
+ }
+ }
+
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DTRTX, value);
+ LOG_DEBUG("read DCC 0x%08" PRIx32, *value);
+
+ return retval;
+}
+
+static int cortex_a8_dap_write_coreregister_u32(struct target *target,
+ uint32_t value, int regnum)
+{
+ int retval = ERROR_OK;
+ uint8_t Rd = regnum&0xFF;
+ uint32_t dscr;
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+
+ LOG_DEBUG("register %i, value 0x%08" PRIx32, regnum, value);
+
+ /* Check that DCCRX is not full */
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ if (dscr & DSCR_DTR_RX_FULL)
+ {
+ LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
+ /* Clear DCCRX with MRC(p14, 0, Rd, c0, c5, 0), opcode 0xEE100E15 */
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+
+ if (Rd > 17)
+ return retval;
+
+ /* Write DTRRX ... sets DSCR.DTRRXfull but exec_opcode() won't care */
+ LOG_DEBUG("write DCC 0x%08" PRIx32, value);
+ retval = mem_ap_sel_write_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DTRRX, value);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (Rd < 15)
+ {
+ /* DCCRX to Rn, "MRC p14, 0, Rn, c0, c5, 0", 0xEE10nE15 */
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, Rd, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ else if (Rd == 15)
+ {
+ /* DCCRX to R0, "MRC p14, 0, R0, c0, c5, 0", 0xEE100E15
+ * then "mov r15, r0"
+ */
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_exec_opcode(target, 0xE1A0F000, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ else
+ {
+ /* DCCRX to R0, "MRC p14, 0, R0, c0, c5, 0", 0xEE100E15
+ * then "MSR CPSR_cxsf, r0" or "MSR SPSR_cxsf, r0" (all fields)
+ */
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_MSR_GP(0, 0xF, Rd & 1),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* "Prefetch flush" after modifying execution status in CPSR */
+ if (Rd == 16)
+ {
+ retval = cortex_a8_exec_opcode(target,
+ ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ }
+
+ return retval;
+}
+
+/* Write to memory mapped registers directly with no cache or mmu handling */
+static int cortex_a8_dap_write_memap_register_u32(struct target *target, uint32_t address, uint32_t value)
+{
+ int retval;
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+
+ retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap, address, value);
+
+ return retval;
+}
+
+/*
+ * Cortex-A8 implementation of Debug Programmer's Model
+ *
+ * NOTE the invariant: these routines return with DSCR_INSTR_COMP set,
+ * so there's no need to poll for it before executing an instruction.
+ *
+ * NOTE that in several of these cases the "stall" mode might be useful.
+ * It'd let us queue a few operations together... prepare/finish might
+ * be the places to enable/disable that mode.
+ */
+
+static inline struct cortex_a8_common *dpm_to_a8(struct arm_dpm *dpm)
+{
+ return container_of(dpm, struct cortex_a8_common, armv7a_common.dpm);
+}
+
+static int cortex_a8_write_dcc(struct cortex_a8_common *a8, uint32_t data)
+{
+ LOG_DEBUG("write DCC 0x%08" PRIx32, data);
+ return mem_ap_sel_write_u32(&a8->armv7a_common.dap, swjdp_debugap,
+ a8->armv7a_common.debug_base + CPUDBG_DTRRX, data);
+}
+
+static int cortex_a8_read_dcc(struct cortex_a8_common *a8, uint32_t *data,
+ uint32_t *dscr_p)
+{
+ struct adiv5_dap *swjdp = &a8->armv7a_common.dap;
+ uint32_t dscr = DSCR_INSTR_COMP;
+ int retval;
+
+ if (dscr_p)
+ dscr = *dscr_p;
+
+ /* Wait for DTRRXfull */
+ long long then = timeval_ms();
+ while ((dscr & DSCR_DTR_TX_FULL) == 0) {
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ a8->armv7a_common.debug_base + CPUDBG_DSCR,
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ if (timeval_ms() > then + 1000)
+ {
+ LOG_ERROR("Timeout waiting for read dcc");
+ return ERROR_FAIL;
+ }
+ }
+
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ a8->armv7a_common.debug_base + CPUDBG_DTRTX, data);
+ if (retval != ERROR_OK)
+ return retval;
+ //LOG_DEBUG("read DCC 0x%08" PRIx32, *data);
+
+ if (dscr_p)
+ *dscr_p = dscr;
+
+ return retval;
+}
+
+static int cortex_a8_dpm_prepare(struct arm_dpm *dpm)
+{
+ struct cortex_a8_common *a8 = dpm_to_a8(dpm);
+ struct adiv5_dap *swjdp = &a8->armv7a_common.dap;
+ uint32_t dscr;
+ int retval;
+
+ /* set up invariant: INSTR_COMP is set after ever DPM operation */
+ long long then = timeval_ms();
+ for (;;)
+ {
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ a8->armv7a_common.debug_base + CPUDBG_DSCR,
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ if ((dscr & DSCR_INSTR_COMP) != 0)
+ break;
+ if (timeval_ms() > then + 1000)
+ {
+ LOG_ERROR("Timeout waiting for dpm prepare");
+ return ERROR_FAIL;
+ }
+ }
+
+ /* this "should never happen" ... */
+ if (dscr & DSCR_DTR_RX_FULL) {
+ LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
+ /* Clear DCCRX */
+ retval = cortex_a8_exec_opcode(
+ a8->armv7a_common.armv4_5_common.target,
+ ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+
+ return retval;
+}
+
+static int cortex_a8_dpm_finish(struct arm_dpm *dpm)
+{
+ /* REVISIT what could be done here? */
+ return ERROR_OK;
+}
+
+static int cortex_a8_instr_write_data_dcc(struct arm_dpm *dpm,
+ uint32_t opcode, uint32_t data)
+{
+ struct cortex_a8_common *a8 = dpm_to_a8(dpm);
+ int retval;
+ uint32_t dscr = DSCR_INSTR_COMP;
+
+ retval = cortex_a8_write_dcc(a8, data);
+ if (retval != ERROR_OK)
+ return retval;
+
+ return cortex_a8_exec_opcode(
+ a8->armv7a_common.armv4_5_common.target,
+ opcode,
+ &dscr);
+}
+
+static int cortex_a8_instr_write_data_r0(struct arm_dpm *dpm,
+ uint32_t opcode, uint32_t data)
+{
+ struct cortex_a8_common *a8 = dpm_to_a8(dpm);
+ uint32_t dscr = DSCR_INSTR_COMP;
+ int retval;
+
+ retval = cortex_a8_write_dcc(a8, data);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15 */
+ retval = cortex_a8_exec_opcode(
+ a8->armv7a_common.armv4_5_common.target,
+ ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* then the opcode, taking data from R0 */
+ retval = cortex_a8_exec_opcode(
+ a8->armv7a_common.armv4_5_common.target,
+ opcode,
+ &dscr);
+
+ return retval;
+}
+
+static int cortex_a8_instr_cpsr_sync(struct arm_dpm *dpm)
+{
+ struct target *target = dpm->arm->target;
+ uint32_t dscr = DSCR_INSTR_COMP;
+
+ /* "Prefetch flush" after modifying execution status in CPSR */
+ return cortex_a8_exec_opcode(target,
+ ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
+ &dscr);
+}
+
+static int cortex_a8_instr_read_data_dcc(struct arm_dpm *dpm,
+ uint32_t opcode, uint32_t *data)
+{
+ struct cortex_a8_common *a8 = dpm_to_a8(dpm);
+ int retval;
+ uint32_t dscr = DSCR_INSTR_COMP;
+
+ /* the opcode, writing data to DCC */
+ retval = cortex_a8_exec_opcode(
+ a8->armv7a_common.armv4_5_common.target,
+ opcode,
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ return cortex_a8_read_dcc(a8, data, &dscr);
+}
+
+
+static int cortex_a8_instr_read_data_r0(struct arm_dpm *dpm,
+ uint32_t opcode, uint32_t *data)
+{
+ struct cortex_a8_common *a8 = dpm_to_a8(dpm);
+ uint32_t dscr = DSCR_INSTR_COMP;
+ int retval;
+
+ /* the opcode, writing data to R0 */
+ retval = cortex_a8_exec_opcode(
+ a8->armv7a_common.armv4_5_common.target,
+ opcode,
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* write R0 to DCC */
+ retval = cortex_a8_exec_opcode(
+ a8->armv7a_common.armv4_5_common.target,
+ ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
+ &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ return cortex_a8_read_dcc(a8, data, &dscr);
+}
+
+static int cortex_a8_bpwp_enable(struct arm_dpm *dpm, unsigned index_t,
+ uint32_t addr, uint32_t control)
+{
+ struct cortex_a8_common *a8 = dpm_to_a8(dpm);
+ uint32_t vr = a8->armv7a_common.debug_base;
+ uint32_t cr = a8->armv7a_common.debug_base;
+ int retval;
+
+ switch (index_t) {
+ case 0 ... 15: /* breakpoints */
+ vr += CPUDBG_BVR_BASE;
+ cr += CPUDBG_BCR_BASE;
+ break;
+ case 16 ... 31: /* watchpoints */
+ vr += CPUDBG_WVR_BASE;
+ cr += CPUDBG_WCR_BASE;
+ index_t -= 16;
+ break;
+ default:
+ return ERROR_FAIL;
+ }
+ vr += 4 * index_t;
+ cr += 4 * index_t;
+
+ LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x",
+ (unsigned) vr, (unsigned) cr);
+
+ retval = cortex_a8_dap_write_memap_register_u32(dpm->arm->target,
+ vr, addr);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_dap_write_memap_register_u32(dpm->arm->target,
+ cr, control);
+ return retval;
+}
+
+static int cortex_a8_bpwp_disable(struct arm_dpm *dpm, unsigned index_t)
+{
+ struct cortex_a8_common *a8 = dpm_to_a8(dpm);
+ uint32_t cr;
+
+ switch (index_t) {
+ case 0 ... 15:
+ cr = a8->armv7a_common.debug_base + CPUDBG_BCR_BASE;
+ break;
+ case 16 ... 31:
+ cr = a8->armv7a_common.debug_base + CPUDBG_WCR_BASE;
+ index_t -= 16;
+ break;
+ default:
+ return ERROR_FAIL;
+ }
+ cr += 4 * index_t;
+
+ LOG_DEBUG("A8: bpwp disable, cr %08x", (unsigned) cr);
+
+ /* clear control register */
+ return cortex_a8_dap_write_memap_register_u32(dpm->arm->target, cr, 0);
+}
+
+static int cortex_a8_dpm_setup(struct cortex_a8_common *a8, uint32_t didr)
+{
+ struct arm_dpm *dpm = &a8->armv7a_common.dpm;
+ int retval;
+
+ dpm->arm = &a8->armv7a_common.armv4_5_common;
+ dpm->didr = didr;
+
+ dpm->prepare = cortex_a8_dpm_prepare;
+ dpm->finish = cortex_a8_dpm_finish;
+
+ dpm->instr_write_data_dcc = cortex_a8_instr_write_data_dcc;
+ dpm->instr_write_data_r0 = cortex_a8_instr_write_data_r0;
+ dpm->instr_cpsr_sync = cortex_a8_instr_cpsr_sync;
+
+ dpm->instr_read_data_dcc = cortex_a8_instr_read_data_dcc;
+ dpm->instr_read_data_r0 = cortex_a8_instr_read_data_r0;
+
+ dpm->bpwp_enable = cortex_a8_bpwp_enable;
+ dpm->bpwp_disable = cortex_a8_bpwp_disable;
+
+ retval = arm_dpm_setup(dpm);
+ if (retval == ERROR_OK)
+ retval = arm_dpm_initialize(dpm);
+
+ return retval;
+}
+
+
+/*
+ * Cortex-A8 Run control
+ */
+
+static int cortex_a8_poll(struct target *target)
+{
+ int retval = ERROR_OK;
+ uint32_t dscr;
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ struct adiv5_dap *swjdp = &armv7a->dap;
+ enum target_state prev_target_state = target->state;
+
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ {
+ return retval;
+ }
+ cortex_a8->cpudbg_dscr = dscr;
+
+ if (DSCR_RUN_MODE(dscr) == (DSCR_CORE_HALTED | DSCR_CORE_RESTARTED))
+ {
+ if (prev_target_state != TARGET_HALTED)
+ {
+ /* We have a halting debug event */
+ LOG_DEBUG("Target halted");
+ target->state = TARGET_HALTED;
+ if ((prev_target_state == TARGET_RUNNING)
+ || (prev_target_state == TARGET_RESET))
+ {
+ retval = cortex_a8_debug_entry(target);
+ if (retval != ERROR_OK)
+ return retval;
+
+ target_call_event_callbacks(target,
+ TARGET_EVENT_HALTED);
+ }
+ if (prev_target_state == TARGET_DEBUG_RUNNING)
+ {
+ LOG_DEBUG(" ");
+
+ retval = cortex_a8_debug_entry(target);
+ if (retval != ERROR_OK)
+ return retval;
+
+ target_call_event_callbacks(target,
+ TARGET_EVENT_DEBUG_HALTED);
+ }
+ }
+ }
+ else if (DSCR_RUN_MODE(dscr) == DSCR_CORE_RESTARTED)
+ {
+ target->state = TARGET_RUNNING;
+ }
+ else
+ {
+ LOG_DEBUG("Unknown target state dscr = 0x%08" PRIx32, dscr);
+ target->state = TARGET_UNKNOWN;
+ }
+
+ return retval;
+}
+
+static int cortex_a8_halt(struct target *target)
+{
+ int retval = ERROR_OK;
+ uint32_t dscr;
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+
+ /*
+ * Tell the core to be halted by writing DRCR with 0x1
+ * and then wait for the core to be halted.
+ */
+ retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DRCR, DRCR_HALT);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /*
+ * enter halting debug mode
+ */
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, dscr | DSCR_HALT_DBG_MODE);
+ if (retval != ERROR_OK)
+ return retval;
+
+ long long then = timeval_ms();
+ for (;;)
+ {
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ if ((dscr & DSCR_CORE_HALTED) != 0)
+ {
+ break;
+ }
+ if (timeval_ms() > then + 1000)
+ {
+ LOG_ERROR("Timeout waiting for halt");
+ return ERROR_FAIL;
+ }
+ }
+
+ target->debug_reason = DBG_REASON_DBGRQ;
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_resume(struct target *target, int current,
+ uint32_t address, int handle_breakpoints, int debug_execution)
+{
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct arm *armv4_5 = &armv7a->armv4_5_common;
+ struct adiv5_dap *swjdp = &armv7a->dap;
+ int retval;
+
+// struct breakpoint *breakpoint = NULL;
+ uint32_t resume_pc, dscr;
+
+ if (!debug_execution)
+ target_free_all_working_areas(target);
+
+#if 0
+ if (debug_execution)
+ {
+ /* Disable interrupts */
+ /* We disable interrupts in the PRIMASK register instead of
+ * masking with C_MASKINTS,
+ * This is probably the same issue as Cortex-M3 Errata 377493:
+ * C_MASKINTS in parallel with disabled interrupts can cause
+ * local faults to not be taken. */
+ buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
+ armv7m->core_cache->reg_list[ARMV7M_PRIMASK].dirty = 1;
+ armv7m->core_cache->reg_list[ARMV7M_PRIMASK].valid = 1;
+
+ /* Make sure we are in Thumb mode */
+ buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
+ buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1 << 24));
+ armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = 1;
+ armv7m->core_cache->reg_list[ARMV7M_xPSR].valid = 1;
+ }
+#endif
+
+ /* current = 1: continue on current pc, otherwise continue at <address> */
+ resume_pc = buf_get_u32(armv4_5->pc->value, 0, 32);
+ if (!current)
+ resume_pc = address;
+
+ /* Make sure that the Armv7 gdb thumb fixups does not
+ * kill the return address
+ */
+ switch (armv4_5->core_state)
+ {
+ case ARM_STATE_ARM:
+ resume_pc &= 0xFFFFFFFC;
+ break;
+ case ARM_STATE_THUMB:
+ case ARM_STATE_THUMB_EE:
+ /* When the return address is loaded into PC
+ * bit 0 must be 1 to stay in Thumb state
+ */
+ resume_pc |= 0x1;
+ break;
+ case ARM_STATE_JAZELLE:
+ LOG_ERROR("How do I resume into Jazelle state??");
+ return ERROR_FAIL;
+ }
+ LOG_DEBUG("resume pc = 0x%08" PRIx32, resume_pc);
+ buf_set_u32(armv4_5->pc->value, 0, 32, resume_pc);
+ armv4_5->pc->dirty = 1;
+ armv4_5->pc->valid = 1;
+
+ retval = cortex_a8_restore_context(target, handle_breakpoints);
+ if (retval != ERROR_OK)
+ return retval;
+
+#if 0
+ /* the front-end may request us not to handle breakpoints */
+ if (handle_breakpoints)
+ {
+ /* Single step past breakpoint at current address */
+ if ((breakpoint = breakpoint_find(target, resume_pc)))
+ {
+ LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
+ cortex_m3_unset_breakpoint(target, breakpoint);
+ cortex_m3_single_step_core(target);
+ cortex_m3_set_breakpoint(target, breakpoint);
+ }
+ }
+
+#endif
+
+ /*
+ * Restart core and wait for it to be started. Clear ITRen and sticky
+ * exception flags: see ARMv7 ARM, C5.9.
+ *
+ * REVISIT: for single stepping, we probably want to
+ * disable IRQs by default, with optional override...
+ */
+
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if ((dscr & DSCR_INSTR_COMP) == 0)
+ LOG_ERROR("DSCR InstrCompl must be set before leaving debug!");
+
+ retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, dscr & ~DSCR_ITR_EN);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DRCR, DRCR_RESTART | DRCR_CLEAR_EXCEPTIONS);
+ if (retval != ERROR_OK)
+ return retval;
+
+ long long then = timeval_ms();
+ for (;;)
+ {
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+ if ((dscr & DSCR_CORE_RESTARTED) != 0)
+ break;
+ if (timeval_ms() > then + 1000)
+ {
+ LOG_ERROR("Timeout waiting for resume");
+ return ERROR_FAIL;
+ }
+ }
+
+ target->debug_reason = DBG_REASON_NOTHALTED;
+ target->state = TARGET_RUNNING;
+
+ /* registers are now invalid */
+ register_cache_invalidate(armv4_5->core_cache);
+
+ if (!debug_execution)
+ {
+ target->state = TARGET_RUNNING;
+ target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
+ LOG_DEBUG("target resumed at 0x%" PRIx32, resume_pc);
+ }
+ else
+ {
+ target->state = TARGET_DEBUG_RUNNING;
+ target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
+ LOG_DEBUG("target debug resumed at 0x%" PRIx32, resume_pc);
+ }
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_debug_entry(struct target *target)
+{
+ int i;
+ uint32_t regfile[16], cpsr, dscr;
+ int retval = ERROR_OK;
+ struct working_area *regfile_working_area = NULL;
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct arm *armv4_5 = &armv7a->armv4_5_common;
+ struct adiv5_dap *swjdp = &armv7a->dap;
+ struct reg *reg;
+
+ LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a8->cpudbg_dscr);
+
+ /* REVISIT surely we should not re-read DSCR !! */
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, &dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* REVISIT see A8 TRM 12.11.4 steps 2..3 -- make sure that any
+ * imprecise data aborts get discarded by issuing a Data
+ * Synchronization Barrier: ARMV4_5_MCR(15, 0, 0, 7, 10, 4).
+ */
+
+ /* Enable the ITR execution once we are in debug mode */
+ dscr |= DSCR_ITR_EN;
+ retval = mem_ap_sel_write_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DSCR, dscr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* Examine debug reason */
+ arm_dpm_report_dscr(&armv7a->dpm, cortex_a8->cpudbg_dscr);
+
+ /* save address of instruction that triggered the watchpoint? */
+ if (target->debug_reason == DBG_REASON_WATCHPOINT) {
+ uint32_t wfar;
+
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_WFAR,
+ &wfar);
+ if (retval != ERROR_OK)
+ return retval;
+ arm_dpm_report_wfar(&armv7a->dpm, wfar);
+ }
+
+ /* REVISIT fast_reg_read is never set ... */
+
+ /* Examine target state and mode */
+ if (cortex_a8->fast_reg_read)
+ target_alloc_working_area(target, 64, &regfile_working_area);
+
+ /* First load register acessible through core debug port*/
+ if (!regfile_working_area)
+ {
+ retval = arm_dpm_read_current_registers(&armv7a->dpm);
+ }
+ else
+ {
+ retval = cortex_a8_read_regs_through_mem(target,
+ regfile_working_area->address, regfile);
+
+ target_free_working_area(target, regfile_working_area);
+ if (retval != ERROR_OK)
+ {
+ return retval;
+ }
+
+ /* read Current PSR */
+ retval = cortex_a8_dap_read_coreregister_u32(target, &cpsr, 16);
+ if (retval != ERROR_OK)
+ return retval;
+
+ LOG_DEBUG("cpsr: %8.8" PRIx32, cpsr);
+
+ arm_set_cpsr(armv4_5, cpsr);
+
+ /* update cache */
+ for (i = 0; i <= ARM_PC; i++)
+ {
+ reg = arm_reg_current(armv4_5, i);
+
+ buf_set_u32(reg->value, 0, 32, regfile[i]);
+ reg->valid = 1;
+ reg->dirty = 0;
+ }
+
+ /* Fixup PC Resume Address */
+ if (cpsr & (1 << 5))
+ {
+ // T bit set for Thumb or ThumbEE state
+ regfile[ARM_PC] -= 4;
+ }
+ else
+ {
+ // ARM state
+ regfile[ARM_PC] -= 8;
+ }
+
+ reg = armv4_5->pc;
+ buf_set_u32(reg->value, 0, 32, regfile[ARM_PC]);
+ reg->dirty = reg->valid;
+ }
+
+#if 0
+/* TODO, Move this */
+ uint32_t cp15_control_register, cp15_cacr, cp15_nacr;
+ cortex_a8_read_cp(target, &cp15_control_register, 15, 0, 1, 0, 0);
+ LOG_DEBUG("cp15_control_register = 0x%08x", cp15_control_register);
+
+ cortex_a8_read_cp(target, &cp15_cacr, 15, 0, 1, 0, 2);
+ LOG_DEBUG("cp15 Coprocessor Access Control Register = 0x%08x", cp15_cacr);
+
+ cortex_a8_read_cp(target, &cp15_nacr, 15, 0, 1, 1, 2);
+ LOG_DEBUG("cp15 Nonsecure Access Control Register = 0x%08x", cp15_nacr);
+#endif
+
+ /* Are we in an exception handler */
+// armv4_5->exception_number = 0;
+ if (armv7a->post_debug_entry)
+ {
+ retval = armv7a->post_debug_entry(target);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+
+ return retval;
+}
+
+static int cortex_a8_post_debug_entry(struct target *target)
+{
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ int retval;
+
+ /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
+ retval = armv7a->armv4_5_common.mrc(target, 15,
+ 0, 0, /* op1, op2 */
+ 1, 0, /* CRn, CRm */
+ &cortex_a8->cp15_control_reg);
+ if (retval != ERROR_OK)
+ return retval;
+ LOG_DEBUG("cp15_control_reg: %8.8" PRIx32, cortex_a8->cp15_control_reg);
+
+ if (armv7a->armv4_5_mmu.armv4_5_cache.ctype == -1)
+ {
+ uint32_t cache_type_reg;
+
+ /* MRC p15,0,<Rt>,c0,c0,1 ; Read CP15 Cache Type Register */
+ retval = armv7a->armv4_5_common.mrc(target, 15,
+ 0, 1, /* op1, op2 */
+ 0, 0, /* CRn, CRm */
+ &cache_type_reg);
+ if (retval != ERROR_OK)
+ return retval;
+ LOG_DEBUG("cp15 cache type: %8.8x", (unsigned) cache_type_reg);
+
+ /* FIXME the armv4_4 cache info DOES NOT APPLY to Cortex-A8 */
+ armv4_5_identify_cache(cache_type_reg,
+ &armv7a->armv4_5_mmu.armv4_5_cache);
+ }
+
+ armv7a->armv4_5_mmu.mmu_enabled =
+ (cortex_a8->cp15_control_reg & 0x1U) ? 1 : 0;
+ armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled =
+ (cortex_a8->cp15_control_reg & 0x4U) ? 1 : 0;
+ armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled =
+ (cortex_a8->cp15_control_reg & 0x1000U) ? 1 : 0;
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_step(struct target *target, int current, uint32_t address,
+ int handle_breakpoints)
+{
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct arm *armv4_5 = &armv7a->armv4_5_common;
+ struct breakpoint *breakpoint = NULL;
+ struct breakpoint stepbreakpoint;
+ struct reg *r;
+ int retval;
+
+ if (target->state != TARGET_HALTED)
+ {
+ LOG_WARNING("target not halted");
+ return ERROR_TARGET_NOT_HALTED;
+ }
+
+ /* current = 1: continue on current pc, otherwise continue at <address> */
+ r = armv4_5->pc;
+ if (!current)
+ {
+ buf_set_u32(r->value, 0, 32, address);
+ }
+ else
+ {
+ address = buf_get_u32(r->value, 0, 32);
+ }
+
+ /* The front-end may request us not to handle breakpoints.
+ * But since Cortex-A8 uses breakpoint for single step,
+ * we MUST handle breakpoints.
+ */
+ handle_breakpoints = 1;
+ if (handle_breakpoints) {
+ breakpoint = breakpoint_find(target, address);
+ if (breakpoint)
+ cortex_a8_unset_breakpoint(target, breakpoint);
+ }
+
+ /* Setup single step breakpoint */
+ stepbreakpoint.address = address;
+ stepbreakpoint.length = (armv4_5->core_state == ARM_STATE_THUMB)
+ ? 2 : 4;
+ stepbreakpoint.type = BKPT_HARD;
+ stepbreakpoint.set = 0;
+
+ /* Break on IVA mismatch */
+ cortex_a8_set_breakpoint(target, &stepbreakpoint, 0x04);
+
+ target->debug_reason = DBG_REASON_SINGLESTEP;
+
+ retval = cortex_a8_resume(target, 1, address, 0, 0);
+ if (retval != ERROR_OK)
+ return retval;
+
+ long long then = timeval_ms();
+ while (target->state != TARGET_HALTED)
+ {
+ retval = cortex_a8_poll(target);
+ if (retval != ERROR_OK)
+ return retval;
+ if (timeval_ms() > then + 1000)
+ {
+ LOG_ERROR("timeout waiting for target halt");
+ return ERROR_FAIL;
+ }
+ }
+
+ cortex_a8_unset_breakpoint(target, &stepbreakpoint);
+
+ target->debug_reason = DBG_REASON_BREAKPOINT;
+
+ if (breakpoint)
+ cortex_a8_set_breakpoint(target, breakpoint, 0);
+
+ if (target->state != TARGET_HALTED)
+ LOG_DEBUG("target stepped");
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_restore_context(struct target *target, bool bpwp)
+{
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+
+ LOG_DEBUG(" ");
+
+ if (armv7a->pre_restore_context)
+ armv7a->pre_restore_context(target);
+
+ return arm_dpm_write_dirty_registers(&armv7a->dpm, bpwp);
+}
+
+
+/*
+ * Cortex-A8 Breakpoint and watchpoint functions
+ */
+
+/* Setup hardware Breakpoint Register Pair */
+static int cortex_a8_set_breakpoint(struct target *target,
+ struct breakpoint *breakpoint, uint8_t matchmode)
+{
+ int retval;
+ int brp_i=0;
+ uint32_t control;
+ uint8_t byte_addr_select = 0x0F;
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ struct cortex_a8_brp * brp_list = cortex_a8->brp_list;
+
+ if (breakpoint->set)
+ {
+ LOG_WARNING("breakpoint already set");
+ return ERROR_OK;
+ }
+
+ if (breakpoint->type == BKPT_HARD)
+ {
+ while (brp_list[brp_i].used && (brp_i < cortex_a8->brp_num))
+ brp_i++ ;
+ if (brp_i >= cortex_a8->brp_num)
+ {
+ LOG_ERROR("ERROR Can not find free Breakpoint Register Pair");
+ return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+ }
+ breakpoint->set = brp_i + 1;
+ if (breakpoint->length == 2)
+ {
+ byte_addr_select = (3 << (breakpoint->address & 0x02));
+ }
+ control = ((matchmode & 0x7) << 20)
+ | (byte_addr_select << 5)
+ | (3 << 1) | 1;
+ brp_list[brp_i].used = 1;
+ brp_list[brp_i].value = (breakpoint->address & 0xFFFFFFFC);
+ brp_list[brp_i].control = control;
+ retval = cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
+ + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
+ brp_list[brp_i].value);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
+ + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
+ brp_list[brp_i].control);
+ if (retval != ERROR_OK)
+ return retval;
+ LOG_DEBUG("brp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
+ brp_list[brp_i].control,
+ brp_list[brp_i].value);
+ }
+ else if (breakpoint->type == BKPT_SOFT)
+ {
+ uint8_t code[4];
+ if (breakpoint->length == 2)
+ {
+ buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
+ }
+ else
+ {
+ buf_set_u32(code, 0, 32, ARMV5_BKPT(0x11));
+ }
+ retval = target->type->read_memory(target,
+ breakpoint->address & 0xFFFFFFFE,
+ breakpoint->length, 1,
+ breakpoint->orig_instr);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = target->type->write_memory(target,
+ breakpoint->address & 0xFFFFFFFE,
+ breakpoint->length, 1, code);
+ if (retval != ERROR_OK)
+ return retval;
+ breakpoint->set = 0x11; /* Any nice value but 0 */
+ }
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
+{
+ int retval;
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ struct cortex_a8_brp * brp_list = cortex_a8->brp_list;
+
+ if (!breakpoint->set)
+ {
+ LOG_WARNING("breakpoint not set");
+ return ERROR_OK;
+ }
+
+ if (breakpoint->type == BKPT_HARD)
+ {
+ int brp_i = breakpoint->set - 1;
+ if ((brp_i < 0) || (brp_i >= cortex_a8->brp_num))
+ {
+ LOG_DEBUG("Invalid BRP number in breakpoint");
+ return ERROR_OK;
+ }
+ LOG_DEBUG("rbp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
+ brp_list[brp_i].control, brp_list[brp_i].value);
+ brp_list[brp_i].used = 0;
+ brp_list[brp_i].value = 0;
+ brp_list[brp_i].control = 0;
+ retval = cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
+ + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
+ brp_list[brp_i].control);
+ if (retval != ERROR_OK)
+ return retval;
+ retval = cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
+ + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
+ brp_list[brp_i].value);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ else
+ {
+ /* restore original instruction (kept in target endianness) */
+ if (breakpoint->length == 4)
+ {
+ retval = target->type->write_memory(target,
+ breakpoint->address & 0xFFFFFFFE,
+ 4, 1, breakpoint->orig_instr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ else
+ {
+ retval = target->type->write_memory(target,
+ breakpoint->address & 0xFFFFFFFE,
+ 2, 1, breakpoint->orig_instr);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ }
+ breakpoint->set = 0;
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_add_breakpoint(struct target *target,
+ struct breakpoint *breakpoint)
+{
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+
+ if ((breakpoint->type == BKPT_HARD) && (cortex_a8->brp_num_available < 1))
+ {
+ LOG_INFO("no hardware breakpoint available");
+ return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+ }
+
+ if (breakpoint->type == BKPT_HARD)
+ cortex_a8->brp_num_available--;
+
+ return cortex_a8_set_breakpoint(target, breakpoint, 0x00); /* Exact match */
+}
+
+static int cortex_a8_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
+{
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+
+#if 0
+/* It is perfectly possible to remove breakpoints while the target is running */
+ if (target->state != TARGET_HALTED)
+ {
+ LOG_WARNING("target not halted");
+ return ERROR_TARGET_NOT_HALTED;
+ }
+#endif
+
+ if (breakpoint->set)
+ {
+ cortex_a8_unset_breakpoint(target, breakpoint);
+ if (breakpoint->type == BKPT_HARD)
+ cortex_a8->brp_num_available++ ;
+ }
+
+
+ return ERROR_OK;
+}
+
+
+
+/*
+ * Cortex-A8 Reset functions
+ */
+
+static int cortex_a8_assert_reset(struct target *target)
+{
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+
+ LOG_DEBUG(" ");
+
+ /* FIXME when halt is requested, make it work somehow... */
+
+ /* Issue some kind of warm reset. */
+ if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
+ target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
+ } else if (jtag_get_reset_config() & RESET_HAS_SRST) {
+ /* REVISIT handle "pulls" cases, if there's
+ * hardware that needs them to work.
+ */
+ jtag_add_reset(0, 1);
+ } else {
+ LOG_ERROR("%s: how to reset?", target_name(target));
+ return ERROR_FAIL;
+ }
+
+ /* registers are now invalid */
+ register_cache_invalidate(armv7a->armv4_5_common.core_cache);
+
+ target->state = TARGET_RESET;
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_deassert_reset(struct target *target)
+{
+ int retval;
+
+ LOG_DEBUG(" ");
+
+ /* be certain SRST is off */
+ jtag_add_reset(0, 0);
+
+ retval = cortex_a8_poll(target);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (target->reset_halt) {
+ if (target->state != TARGET_HALTED) {
+ LOG_WARNING("%s: ran after reset and before halt ...",
+ target_name(target));
+ if ((retval = target_halt(target)) != ERROR_OK)
+ return retval;
+ }
+ }
+
+ return ERROR_OK;
+}
+
+/*
+ * Cortex-A8 Memory access
+ *
+ * This is same Cortex M3 but we must also use the correct
+ * ap number for every access.
+ */
+
+static int cortex_a8_read_phys_memory(struct target *target,
+ uint32_t address, uint32_t size,
+ uint32_t count, uint8_t *buffer)
+{
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+ int retval = ERROR_INVALID_ARGUMENTS;
+ uint8_t apsel = swjdp->apsel;
+
+ LOG_DEBUG("Reading memory at real address 0x%x; size %d; count %d", address, size, count);
+
+ if (count && buffer) {
+
+ if ( apsel == swjdp_memoryap ) {
+
+ /* read memory through AHB-AP */
+
+ switch (size) {
+ case 4:
+ retval = mem_ap_sel_read_buf_u32(swjdp, swjdp_memoryap,
+ buffer, 4 * count, address);
+ break;
+ case 2:
+ retval = mem_ap_sel_read_buf_u16(swjdp, swjdp_memoryap,
+ buffer, 2 * count, address);
+ break;
+ case 1:
+ retval = mem_ap_sel_read_buf_u8(swjdp, swjdp_memoryap,
+ buffer, count, address);
+ break;
+ }
+
+ } else {
+
+ /* read memory through APB-AP */
+
+ uint32_t saved_r0, saved_r1;
+ int nbytes = count * size;
+ uint32_t data;
+ int enabled = 0;
+
+ if (target->state != TARGET_HALTED)
+ {
+ LOG_WARNING("target not halted");
+ return ERROR_TARGET_NOT_HALTED;
+ }
+
+ retval = cortex_a8_mmu(target, &enabled);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (enabled)
+ {
+ LOG_WARNING("Reading physical memory through APB with MMU enabled is not yet implemented");
+ return ERROR_TARGET_FAILURE;
+ }
+
+ /* save registers r0 and r1, we are going to corrupt them */
+ retval = cortex_a8_dap_read_coreregister_u32(target, &saved_r0, 0);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = cortex_a8_dap_read_coreregister_u32(target, &saved_r1, 1);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = cortex_a8_dap_write_coreregister_u32(target, address, 0);
+ if (retval != ERROR_OK)
+ return retval;
+
+ while (nbytes > 0) {
+
+ /* execute instruction LDRB r1, [r0], 1 (0xe4d01001) */
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_LDRB_IP(1, 0) , NULL);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = cortex_a8_dap_read_coreregister_u32(target, &data, 1);
+ if (retval != ERROR_OK)
+ return retval;
+
+ *buffer++ = data;
+ --nbytes;
+
+ }
+
+ /* restore corrupted registers r0 and r1 */
+ retval = cortex_a8_dap_write_coreregister_u32(target, saved_r0, 0);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = cortex_a8_dap_write_coreregister_u32(target, saved_r1, 1);
+ if (retval != ERROR_OK)
+ return retval;
+
+ }
+ }
+
+ return retval;
+}
+
+static int cortex_a8_read_memory(struct target *target, uint32_t address,
+ uint32_t size, uint32_t count, uint8_t *buffer)
+{
+ int enabled = 0;
+ uint32_t virt, phys;
+ int retval;
+
+ /* cortex_a8 handles unaligned memory access */
+
+ LOG_DEBUG("Reading memory at address 0x%x; size %d; count %d", address, size, count);
+ retval = cortex_a8_mmu(target, &enabled);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if(enabled)
+ {
+ virt = address;
+ retval = cortex_a8_virt2phys(target, virt, &phys);
+ if (retval != ERROR_OK)
+ return retval;
+
+ LOG_DEBUG("Reading at virtual address. Translating v:0x%x to r:0x%x", virt, phys);
+ address = phys;
+ }
+
+ return cortex_a8_read_phys_memory(target, address, size, count, buffer);
+}
+
+static int cortex_a8_write_phys_memory(struct target *target,
+ uint32_t address, uint32_t size,
+ uint32_t count, uint8_t *buffer)
+{
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+ int retval = ERROR_INVALID_ARGUMENTS;
+ uint8_t apsel = swjdp->apsel;
+
+ LOG_DEBUG("Writing memory to real address 0x%x; size %d; count %d", address, size, count);
+
+ if (count && buffer) {
+
+ if ( apsel == swjdp_memoryap ) {
+
+ /* write memory through AHB-AP */
+
+ switch (size) {
+ case 4:
+ retval = mem_ap_sel_write_buf_u32(swjdp, swjdp_memoryap,
+ buffer, 4 * count, address);
+ break;
+ case 2:
+ retval = mem_ap_sel_write_buf_u16(swjdp, swjdp_memoryap,
+ buffer, 2 * count, address);
+ break;
+ case 1:
+ retval = mem_ap_sel_write_buf_u8(swjdp, swjdp_memoryap,
+ buffer, count, address);
+ break;
+ }
+
+ } else {
+
+ /* write memory through APB-AP */
+
+ uint32_t saved_r0, saved_r1;
+ int nbytes = count * size;
+ uint32_t data;
+ int enabled = 0;
+
+ if (target->state != TARGET_HALTED)
+ {
+ LOG_WARNING("target not halted");
+ return ERROR_TARGET_NOT_HALTED;
+ }
+
+ retval = cortex_a8_mmu(target, &enabled);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (enabled)
+ {
+ LOG_WARNING("Writing physical memory through APB with MMU enabled is not yet implemented");
+ return ERROR_TARGET_FAILURE;
+ }
+
+ /* save registers r0 and r1, we are going to corrupt them */
+ retval = cortex_a8_dap_read_coreregister_u32(target, &saved_r0, 0);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = cortex_a8_dap_read_coreregister_u32(target, &saved_r1, 1);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = cortex_a8_dap_write_coreregister_u32(target, address, 0);
+ if (retval != ERROR_OK)
+ return retval;
+
+ while (nbytes > 0) {
+
+ data = *buffer++;
+
+ retval = cortex_a8_dap_write_coreregister_u32(target, data, 1);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* execute instruction STRB r1, [r0], 1 (0xe4c01001) */
+ retval = cortex_a8_exec_opcode(target, ARMV4_5_STRB_IP(1, 0) , NULL);
+ if (retval != ERROR_OK)
+ return retval;
+
+ --nbytes;
+ }
+
+ /* restore corrupted registers r0 and r1 */
+ retval = cortex_a8_dap_write_coreregister_u32(target, saved_r0, 0);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = cortex_a8_dap_write_coreregister_u32(target, saved_r1, 1);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* we can return here without invalidating D/I-cache because */
+ /* access through APB maintains cache coherency */
+ return retval;
+ }
+ }
+
+
+ /* REVISIT this op is generic ARMv7-A/R stuff */
+ if (retval == ERROR_OK && target->state == TARGET_HALTED)
+ {
+ struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
+
+ retval = dpm->prepare(dpm);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* The Cache handling will NOT work with MMU active, the
+ * wrong addresses will be invalidated!
+ *
+ * For both ICache and DCache, walk all cache lines in the
+ * address range. Cortex-A8 has fixed 64 byte line length.
+ *
+ * REVISIT per ARMv7, these may trigger watchpoints ...
+ */
+
+ /* invalidate I-Cache */
+ if (armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled)
+ {
+ /* ICIMVAU - Invalidate Cache single entry
+ * with MVA to PoU
+ * MCR p15, 0, r0, c7, c5, 1
+ */
+ for (uint32_t cacheline = address;
+ cacheline < address + size * count;
+ cacheline += 64) {
+ retval = dpm->instr_write_data_r0(dpm,
+ ARMV4_5_MCR(15, 0, 0, 7, 5, 1),
+ cacheline);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ }
+
+ /* invalidate D-Cache */
+ if (armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
+ {
+ /* DCIMVAC - Invalidate data Cache line
+ * with MVA to PoC
+ * MCR p15, 0, r0, c7, c6, 1
+ */
+ for (uint32_t cacheline = address;
+ cacheline < address + size * count;
+ cacheline += 64) {
+ retval = dpm->instr_write_data_r0(dpm,
+ ARMV4_5_MCR(15, 0, 0, 7, 6, 1),
+ cacheline);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ }
+
+ /* (void) */ dpm->finish(dpm);
+ }
+
+ return retval;
+}
+
+static int cortex_a8_write_memory(struct target *target, uint32_t address,
+ uint32_t size, uint32_t count, uint8_t *buffer)
+{
+ int enabled = 0;
+ uint32_t virt, phys;
+ int retval;
+
+ LOG_DEBUG("Writing memory to address 0x%x; size %d; count %d", address, size, count);
+ retval = cortex_a8_mmu(target, &enabled);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if(enabled)
+ {
+ virt = address;
+ retval = cortex_a8_virt2phys(target, virt, &phys);
+ if (retval != ERROR_OK)
+ return retval;
+ LOG_DEBUG("Writing to virtual address. Translating v:0x%x to r:0x%x", virt, phys);
+ address = phys;
+ }
+
+ return cortex_a8_write_phys_memory(target, address, size,
+ count, buffer);
+}
+
+static int cortex_a8_bulk_write_memory(struct target *target, uint32_t address,
+ uint32_t count, uint8_t *buffer)
+{
+ return cortex_a8_write_memory(target, address, 4, count, buffer);
+}
+
+static int cortex_a8_dcc_read(struct adiv5_dap *swjdp, uint8_t *value, uint8_t *ctrl)
+{
+#if 0
+ u16 dcrdr;
+
+ mem_ap_read_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
+ *ctrl = (uint8_t)dcrdr;
+ *value = (uint8_t)(dcrdr >> 8);
+
+ LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
+
+ /* write ack back to software dcc register
+ * signify we have read data */
+ if (dcrdr & (1 << 0))
+ {
+ dcrdr = 0;
+ mem_ap_write_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
+ }
+#endif
+ return ERROR_OK;
+}
+
+
+static int cortex_a8_handle_target_request(void *priv)
+{
+ struct target *target = priv;
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+ struct adiv5_dap *swjdp = &armv7a->dap;
+ int retval;
+
+ if (!target_was_examined(target))
+ return ERROR_OK;
+ if (!target->dbg_msg_enabled)
+ return ERROR_OK;
+
+ if (target->state == TARGET_RUNNING)
+ {
+ uint8_t data = 0;
+ uint8_t ctrl = 0;
+
+ retval = cortex_a8_dcc_read(swjdp, &data, &ctrl);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* check if we have data */
+ if (ctrl & (1 << 0))
+ {
+ uint32_t request;
+
+ /* we assume target is quick enough */
+ request = data;
+ retval = cortex_a8_dcc_read(swjdp, &data, &ctrl);
+ if (retval != ERROR_OK)
+ return retval;
+ request |= (data << 8);
+ retval = cortex_a8_dcc_read(swjdp, &data, &ctrl);
+ if (retval != ERROR_OK)
+ return retval;
+ request |= (data << 16);
+ retval = cortex_a8_dcc_read(swjdp, &data, &ctrl);
+ if (retval != ERROR_OK)
+ return retval;
+ request |= (data << 24);
+ target_request(target, request);
+ }
+ }
+
+ return ERROR_OK;
+}
+
+/*
+ * Cortex-A8 target information and configuration
+ */
+
+static int cortex_a8_examine_first(struct target *target)
+{
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ struct adiv5_dap *swjdp = &armv7a->dap;
+ int i;
+ int retval = ERROR_OK;
+ uint32_t didr, ctypr, ttypr, cpuid;
+ uint32_t dbgbase, apid;
+
+ /* We do one extra read to ensure DAP is configured,
+ * we call ahbap_debugport_init(swjdp) instead
+ */
+ retval = ahbap_debugport_init(swjdp);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* Get ROM Table base */
+ retval = dap_get_debugbase(swjdp, 1, &dbgbase, &apid);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* Lookup 0x15 -- Processor DAP */
+ retval = dap_lookup_cs_component(swjdp, 1, dbgbase, 0x15,
+ &armv7a->debug_base);
+ if (retval != ERROR_OK)
+ return retval;
+
+#if 0
+ /*
+ * FIXME: assuming omap4430
+ *
+ * APB DBGBASE reads 0x80040000, but this points to an empty ROM table.
+ * 0x80000000 is cpu0 coresight region
+ */
+ if (target->coreid > 3) {
+ LOG_ERROR("cortex_a8 supports up to 4 cores");
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ armv7a->debug_base = 0x80000000 |
+ ((target->coreid & 0x3) << CORTEX_A8_PADDRDBG_CPU_SHIFT);
+#endif
+
+ retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_CPUID, &cpuid);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if ((retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_CPUID, &cpuid)) != ERROR_OK)
+ {
+ LOG_DEBUG("Examine %s failed", "CPUID");
+ return retval;
+ }
+
+ if ((retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_CTYPR, &ctypr)) != ERROR_OK)
+ {
+ LOG_DEBUG("Examine %s failed", "CTYPR");
+ return retval;
+ }
+
+ if ((retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_TTYPR, &ttypr)) != ERROR_OK)
+ {
+ LOG_DEBUG("Examine %s failed", "TTYPR");
+ return retval;
+ }
+
+ if ((retval = mem_ap_sel_read_atomic_u32(swjdp, swjdp_debugap,
+ armv7a->debug_base + CPUDBG_DIDR, &didr)) != ERROR_OK)
+ {
+ LOG_DEBUG("Examine %s failed", "DIDR");
+ return retval;
+ }
+
+ LOG_DEBUG("cpuid = 0x%08" PRIx32, cpuid);
+ LOG_DEBUG("ctypr = 0x%08" PRIx32, ctypr);
+ LOG_DEBUG("ttypr = 0x%08" PRIx32, ttypr);
+ LOG_DEBUG("didr = 0x%08" PRIx32, didr);
+
+ armv7a->armv4_5_common.core_type = ARM_MODE_MON;
+ retval = cortex_a8_dpm_setup(cortex_a8, didr);
+ if (retval != ERROR_OK)
+ return retval;
+
+ /* Setup Breakpoint Register Pairs */
+ cortex_a8->brp_num = ((didr >> 24) & 0x0F) + 1;
+ cortex_a8->brp_num_context = ((didr >> 20) & 0x0F) + 1;
+ cortex_a8->brp_num_available = cortex_a8->brp_num;
+ cortex_a8->brp_list = calloc(cortex_a8->brp_num, sizeof(struct cortex_a8_brp));
+// cortex_a8->brb_enabled = ????;
+ for (i = 0; i < cortex_a8->brp_num; i++)
+ {
+ cortex_a8->brp_list[i].used = 0;
+ if (i < (cortex_a8->brp_num-cortex_a8->brp_num_context))
+ cortex_a8->brp_list[i].type = BRP_NORMAL;
+ else
+ cortex_a8->brp_list[i].type = BRP_CONTEXT;
+ cortex_a8->brp_list[i].value = 0;
+ cortex_a8->brp_list[i].control = 0;
+ cortex_a8->brp_list[i].BRPn = i;
+ }
+
+ LOG_DEBUG("Configured %i hw breakpoints", cortex_a8->brp_num);
+
+ target_set_examined(target);
+ return ERROR_OK;
+}
+
+static int cortex_a8_examine(struct target *target)
+{
+ int retval = ERROR_OK;
+
+ /* don't re-probe hardware after each reset */
+ if (!target_was_examined(target))
+ retval = cortex_a8_examine_first(target);
+
+ /* Configure core debug access */
+ if (retval == ERROR_OK)
+ retval = cortex_a8_init_debug_access(target);
+
+ return retval;
+}
+
+/*
+ * Cortex-A8 target creation and initialization
+ */
+
+static int cortex_a8_init_target(struct command_context *cmd_ctx,
+ struct target *target)
+{
+ /* examine_first() does a bunch of this */
+ return ERROR_OK;
+}
+
+static int cortex_a8_init_arch_info(struct target *target,
+ struct cortex_a8_common *cortex_a8, struct jtag_tap *tap)
+{
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ struct arm *armv4_5 = &armv7a->armv4_5_common;
+ struct adiv5_dap *dap = &armv7a->dap;
+
+ armv7a->armv4_5_common.dap = dap;
+
+ /* Setup struct cortex_a8_common */
+ cortex_a8->common_magic = CORTEX_A8_COMMON_MAGIC;
+ armv4_5->arch_info = armv7a;
+
+ /* prepare JTAG information for the new target */
+ cortex_a8->jtag_info.tap = tap;
+ cortex_a8->jtag_info.scann_size = 4;
+
+ /* Leave (only) generic DAP stuff for debugport_init() */
+ dap->jtag_info = &cortex_a8->jtag_info;
+ dap->memaccess_tck = 80;
+
+ /* Number of bits for tar autoincrement, impl. dep. at least 10 */
+ dap->tar_autoincr_block = (1 << 10);
+
+ cortex_a8->fast_reg_read = 0;
+
+ /* Set default value */
+ cortex_a8->current_address_mode = ARM_MODE_ANY;
+
+ /* register arch-specific functions */
+ armv7a->examine_debug_reason = NULL;
+
+ armv7a->post_debug_entry = cortex_a8_post_debug_entry;
+
+ armv7a->pre_restore_context = NULL;
+ armv7a->armv4_5_mmu.armv4_5_cache.ctype = -1;
+ armv7a->armv4_5_mmu.get_ttb = cortex_a8_get_ttb;
+ armv7a->armv4_5_mmu.read_memory = cortex_a8_read_phys_memory;
+ armv7a->armv4_5_mmu.write_memory = cortex_a8_write_phys_memory;
+ armv7a->armv4_5_mmu.disable_mmu_caches = cortex_a8_disable_mmu_caches;
+ armv7a->armv4_5_mmu.enable_mmu_caches = cortex_a8_enable_mmu_caches;
+ armv7a->armv4_5_mmu.has_tiny_pages = 1;
+ armv7a->armv4_5_mmu.mmu_enabled = 0;
+
+
+// arm7_9->handle_target_request = cortex_a8_handle_target_request;
+
+ /* REVISIT v7a setup should be in a v7a-specific routine */
+ arm_init_arch_info(target, armv4_5);
+ armv7a->common_magic = ARMV7_COMMON_MAGIC;
+
+ target_register_timer_callback(cortex_a8_handle_target_request, 1, 1, target);
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_target_create(struct target *target, Jim_Interp *interp)
+{
+ struct cortex_a8_common *cortex_a8 = calloc(1, sizeof(struct cortex_a8_common));
+
+ return cortex_a8_init_arch_info(target, cortex_a8, target->tap);
+}
+
+static int cortex_a8_get_ttb(struct target *target, uint32_t *result)
+{
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ uint32_t ttb = 0, retval = ERROR_OK;
+
+ /* current_address_mode is set inside cortex_a8_virt2phys()
+ where we can determine if address belongs to user or kernel */
+ if(cortex_a8->current_address_mode == ARM_MODE_SVC)
+ {
+ /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
+ retval = armv7a->armv4_5_common.mrc(target, 15,
+ 0, 1, /* op1, op2 */
+ 2, 0, /* CRn, CRm */
+ &ttb);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ else if(cortex_a8->current_address_mode == ARM_MODE_USR)
+ {
+ /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
+ retval = armv7a->armv4_5_common.mrc(target, 15,
+ 0, 0, /* op1, op2 */
+ 2, 0, /* CRn, CRm */
+ &ttb);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ /* we don't know whose address is: user or kernel
+ we assume that if we are in kernel mode then
+ address belongs to kernel else if in user mode
+ - to user */
+ else if(armv7a->armv4_5_common.core_mode == ARM_MODE_SVC)
+ {
+ /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
+ retval = armv7a->armv4_5_common.mrc(target, 15,
+ 0, 1, /* op1, op2 */
+ 2, 0, /* CRn, CRm */
+ &ttb);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ else if(armv7a->armv4_5_common.core_mode == ARM_MODE_USR)
+ {
+ /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
+ retval = armv7a->armv4_5_common.mrc(target, 15,
+ 0, 0, /* op1, op2 */
+ 2, 0, /* CRn, CRm */
+ &ttb);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+ /* finally we don't know whose ttb to use: user or kernel */
+ else
+ LOG_ERROR("Don't know how to get ttb for current mode!!!");
+
+ ttb &= 0xffffc000;
+
+ *result = ttb;
+
+ return ERROR_OK;
+}
+
+static int cortex_a8_disable_mmu_caches(struct target *target, int mmu,
+ int d_u_cache, int i_cache)
+{
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ uint32_t cp15_control;
+ int retval;
+
+ /* read cp15 control register */
+ retval = armv7a->armv4_5_common.mrc(target, 15,
+ 0, 0, /* op1, op2 */
+ 1, 0, /* CRn, CRm */
+ &cp15_control);
+ if (retval != ERROR_OK)
+ return retval;
+
+
+ if (mmu)
+ cp15_control &= ~0x1U;
+
+ if (d_u_cache)
+ cp15_control &= ~0x4U;
+
+ if (i_cache)
+ cp15_control &= ~0x1000U;
+
+ retval = armv7a->armv4_5_common.mcr(target, 15,
+ 0, 0, /* op1, op2 */
+ 1, 0, /* CRn, CRm */
+ cp15_control);
+ return retval;
+}
+
+static int cortex_a8_enable_mmu_caches(struct target *target, int mmu,
+ int d_u_cache, int i_cache)
+{
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ uint32_t cp15_control;
+ int retval;
+
+ /* read cp15 control register */
+ retval = armv7a->armv4_5_common.mrc(target, 15,
+ 0, 0, /* op1, op2 */
+ 1, 0, /* CRn, CRm */
+ &cp15_control);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (mmu)
+ cp15_control |= 0x1U;
+
+ if (d_u_cache)
+ cp15_control |= 0x4U;
+
+ if (i_cache)
+ cp15_control |= 0x1000U;
+
+ retval = armv7a->armv4_5_common.mcr(target, 15,
+ 0, 0, /* op1, op2 */
+ 1, 0, /* CRn, CRm */
+ cp15_control);
+ return retval;
+}
+
+
+static int cortex_a8_mmu(struct target *target, int *enabled)
+{
+ if (target->state != TARGET_HALTED) {
+ LOG_ERROR("%s: target not halted", __func__);
+ return ERROR_TARGET_INVALID;
+ }
+
+ *enabled = target_to_cortex_a8(target)->armv7a_common.armv4_5_mmu.mmu_enabled;
+ return ERROR_OK;
+}
+
+static int cortex_a8_virt2phys(struct target *target,
+ uint32_t virt, uint32_t *phys)
+{
+ uint32_t cb;
+ struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
+ // struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+
+ /* We assume that virtual address is separated
+ between user and kernel in Linux style:
+ 0x00000000-0xbfffffff - User space
+ 0xc0000000-0xffffffff - Kernel space */
+ if( virt < 0xc0000000 ) /* Linux user space */
+ cortex_a8->current_address_mode = ARM_MODE_USR;
+ else /* Linux kernel */
+ cortex_a8->current_address_mode = ARM_MODE_SVC;
+ uint32_t ret;
+ int retval = armv4_5_mmu_translate_va(target,
+ &armv7a->armv4_5_mmu, virt, &cb, &ret);
+ if (retval != ERROR_OK)
+ return retval;
+ /* Reset the flag. We don't want someone else to use it by error */
+ cortex_a8->current_address_mode = ARM_MODE_ANY;
+
+ *phys = ret;
+ return ERROR_OK;
+}
+
+COMMAND_HANDLER(cortex_a8_handle_cache_info_command)
+{
+ struct target *target = get_current_target(CMD_CTX);
+ struct armv7a_common *armv7a = target_to_armv7a(target);
+
+ return armv4_5_handle_cache_info_command(CMD_CTX,
+ &armv7a->armv4_5_mmu.armv4_5_cache);
+}
+
+
+COMMAND_HANDLER(cortex_a8_handle_dbginit_command)
+{
+ struct target *target = get_current_target(CMD_CTX);
+ if (!target_was_examined(target))
+ {
+ LOG_ERROR("target not examined yet");
+ return ERROR_FAIL;
+ }
+
+ return cortex_a8_init_debug_access(target);
+}
+
+static const struct command_registration cortex_a8_exec_command_handlers[] = {
+ {
+ .name = "cache_info",
+ .handler = cortex_a8_handle_cache_info_command,
+ .mode = COMMAND_EXEC,
+ .help = "display information about target caches",
+ },
+ {
+ .name = "dbginit",
+ .handler = cortex_a8_handle_dbginit_command,
+ .mode = COMMAND_EXEC,
+ .help = "Initialize core debug",
+ },
+ COMMAND_REGISTRATION_DONE
+};
+static const struct command_registration cortex_a8_command_handlers[] = {
+ {
+ .chain = arm_command_handlers,
+ },
+ {
+ .chain = armv7a_command_handlers,
+ },
+ {
+ .name = "cortex_a8",
+ .mode = COMMAND_ANY,
+ .help = "Cortex-A8 command group",
+ .chain = cortex_a8_exec_command_handlers,
+ },
+ COMMAND_REGISTRATION_DONE
+};
+
+struct target_type cortexa8_target = {
+ .name = "cortex_a8",
+
+ .poll = cortex_a8_poll,
+ .arch_state = armv7a_arch_state,
+
+ .target_request_data = NULL,
+
+ .halt = cortex_a8_halt,
+ .resume = cortex_a8_resume,
+ .step = cortex_a8_step,
+
+ .assert_reset = cortex_a8_assert_reset,
+ .deassert_reset = cortex_a8_deassert_reset,
+ .soft_reset_halt = NULL,
+
+ /* REVISIT allow exporting VFP3 registers ... */
+ .get_gdb_reg_list = arm_get_gdb_reg_list,
+
+ .read_memory = cortex_a8_read_memory,
+ .write_memory = cortex_a8_write_memory,
+ .bulk_write_memory = cortex_a8_bulk_write_memory,
+
+ .checksum_memory = arm_checksum_memory,
+ .blank_check_memory = arm_blank_check_memory,
+
+ .run_algorithm = armv4_5_run_algorithm,
+
+ .add_breakpoint = cortex_a8_add_breakpoint,
+ .remove_breakpoint = cortex_a8_remove_breakpoint,
+ .add_watchpoint = NULL,
+ .remove_watchpoint = NULL,
+
+ .commands = cortex_a8_command_handlers,
+ .target_create = cortex_a8_target_create,
+ .init_target = cortex_a8_init_target,
+ .examine = cortex_a8_examine,
+
+ .read_phys_memory = cortex_a8_read_phys_memory,
+ .write_phys_memory = cortex_a8_write_phys_memory,
+ .mmu = cortex_a8_mmu,
+ .virt2phys = cortex_a8_virt2phys,
+
+};
generated by cgit v1.2.3 (git 2.46.0) at 2024-11-17 19:50:38 +0000