diff options
Diffstat (limited to 'src/target')
| -rw-r--r-- | src/target/target.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/target/target.c b/src/target/target.c index c90470c1..03b04e38 100644 --- a/src/target/target.c +++ b/src/target/target.c @@ -76,6 +76,7 @@ int handle_rbp_command(struct command_context_s *cmd_ctx, char *cmd, char **args int handle_wp_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc); int handle_rwp_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc); int handle_virt2phys_command(command_context_t *cmd_ctx, char *cmd, char **args, int argc); +int handle_profile_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc); /* targets */ @@ -766,6 +767,7 @@ int target_register_commands(struct command_context_s *cmd_ctx) register_command(cmd_ctx, NULL, "run_and_halt_time", handle_run_and_halt_time_command, COMMAND_CONFIG, "<target> <run time ms>"); register_command(cmd_ctx, NULL, "working_area", handle_working_area_command, COMMAND_ANY, "working_area <target#> <address> <size> <'backup'|'nobackup'> [virtual address]"); register_command(cmd_ctx, NULL, "virt2phys", handle_virt2phys_command, COMMAND_ANY, "virt2phys <virtual address>"); + register_command(cmd_ctx, NULL, "profile", handle_profile_command, COMMAND_EXEC, "PRELIMINARY! - profile <seconds> <gmon.out>"); return ERROR_OK; } @@ -2273,3 +2275,189 @@ int handle_virt2phys_command(command_context_t *cmd_ctx, char *cmd, char **args, } return retval; } +static void writeLong(FILE *f, int l) +{ + int i; + for (i=0; i<4; i++) + { + char c=(l>>(i*8))&0xff; + fwrite(&c, 1, 1, f); + } + +} +static void writeString(FILE *f, char *s) +{ + fwrite(s, 1, strlen(s), f); +} + + + +// Dump a gmon.out histogram file. +static void writeGmon(u32 *samples, int sampleNum, char *filename) +{ + int i; + FILE *f=fopen(filename, "w"); + if (f==NULL) + return; + fwrite("gmon", 1, 4, f); + writeLong(f, 0x00000001); // Version + writeLong(f, 0); // padding + writeLong(f, 0); // padding + writeLong(f, 0); // padding + + fwrite("", 1, 1, f); // GMON_TAG_TIME_HIST + + // figure out bucket size + u32 min=samples[0]; + u32 max=samples[0]; + for (i=0; i<sampleNum; i++) + { + if (min>samples[i]) + { + min=samples[i]; + } + if (max<samples[i]) + { + max=samples[i]; + } + } + + int addressSpace=(max-min+1); + + static int const maxBuckets=256*1024; // maximum buckets. + int length=addressSpace; + if (length > maxBuckets) + { + length=maxBuckets; + } + int *buckets=malloc(sizeof(int)*length); + if (buckets==NULL) + { + fclose(f); + return; + } + memset(buckets, 0, sizeof(int)*length); + for (i=0; i<sampleNum;i++) + { + u32 address=samples[i]; + long long a=address-min; + long long b=length-1; + long long c=addressSpace-1; + int index=(a*b)/c; // danger!!!! int32 overflows + buckets[index]++; + } + + // append binary memory gmon.out &profile_hist_hdr ((char*)&profile_hist_hdr + sizeof(struct gmon_hist_hdr)) + writeLong(f, min); // low_pc + writeLong(f, max); // high_pc + writeLong(f, length); // # of samples + writeLong(f, 64000000); // 64MHz + writeString(f, "seconds"); + for (i=0; i<(15-strlen("seconds")); i++) + { + fwrite("", 1, 1, f); // padding + } + writeString(f, "s"); + +// append binary memory gmon.out profile_hist_data (profile_hist_data + profile_hist_hdr.hist_size) + + char *data=malloc(2*length); + if (data!=NULL) + { + for (i=0; i<length;i++) + { + int val; + val=buckets[i]; + if (val>65535) + { + val=65535; + } + data[i*2]=val&0xff; + data[i*2+1]=(val>>8)&0xff; + } + free(buckets); + fwrite(data, 1, length*2, f); + free(data); + } else + { + free(buckets); + } + + fclose(f); +} + +/* profiling samples the CPU PC as quickly as OpenOCD is able, which will be used as a random sampling of PC */ +int handle_profile_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc) +{ + target_t *target = get_current_target(cmd_ctx); + struct timeval timeout, now; + + gettimeofday(&timeout, NULL); + if (argc!=2) + { + return ERROR_COMMAND_SYNTAX_ERROR; + } + char *end; + timeval_add_time(&timeout, strtoul(args[0], &end, 0), 0); + if (*end) + { + return ERROR_OK; + } + + command_print(cmd_ctx, "Starting profiling. Halting and resuming the target as often as we can..."); + + static const int maxSample=10000; + u32 *samples=malloc(sizeof(u32)*maxSample); + if (samples==NULL) + return ERROR_OK; + + int numSamples=0; + int retval=ERROR_OK; + // hopefully it is safe to cache! We want to stop/restart as quickly as possible. + reg_t *reg = register_get_by_name(target->reg_cache, "pc", 1); + + for (;;) + { + target->type->poll(target); + if (target->state == TARGET_HALTED) + { + u32 t=*((u32 *)reg->value); + samples[numSamples++]=t; + retval = target->type->resume(target, 1, 0, 0, 0); /* current pc, addr = 0, do not handle breakpoints, not debugging */ + target->type->poll(target); + usleep(10*1000); // sleep 10ms, i.e. <100 samples/second. + } else if (target->state == TARGET_RUNNING) + { + // We want to quickly sample the PC. + target->type->halt(target); + } else + { + command_print(cmd_ctx, "Target not halted or running"); + retval=ERROR_OK; + break; + } + if (retval!=ERROR_OK) + { + break; + } + + gettimeofday(&now, NULL); + if ((numSamples>=maxSample) || ((now.tv_sec >= timeout.tv_sec) && (now.tv_usec >= timeout.tv_usec))) + { + command_print(cmd_ctx, "Profiling completed. %d samples.", numSamples); + target->type->poll(target); + if (target->state == TARGET_HALTED) + { + target->type->resume(target, 1, 0, 0, 0); /* current pc, addr = 0, do not handle breakpoints, not debugging */ + } + target->type->poll(target); + writeGmon(samples, numSamples, args[1]); + command_print(cmd_ctx, "Wrote %s", args[1]); + break; + } + } + free(samples); + + return ERROR_OK; +} + |