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| -rw-r--r-- | src/jtag/jtag.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/jtag/jtag.c b/src/jtag/jtag.c index 605d58aa..663518a3 100644 --- a/src/jtag/jtag.c +++ b/src/jtag/jtag.c @@ -463,6 +463,39 @@ void* cmd_queue_alloc(size_t size) int offset; u8 *t; + /* + * WARNING: + * We align/round the *SIZE* per below + * so that all pointers returned by + * this function are reasonably well + * aligned. + * + * If we did not, then an "odd-length" request would cause the + * *next* allocation to be at an *odd* address, and because + * this function has the same type of api as malloc() - we + * must also return pointers that have the same type of + * alignment. + * + * What I do not/have is a reasonable portable means + * to align by... + * + * The solution here, is based on these suggestions. + * http://gcc.gnu.org/ml/gcc-help/2008-12/msg00041.html + * + */ + union worse_case_align { + int i; + long l; + float f; + void *v; + }; +#define ALIGN_SIZE (sizeof(union worse_case_align)) + + // The alignment process. + size = (size + ALIGN_SIZE -1) & (~(ALIGN_SIZE-1)); + // Done... + + if (*p_page) { while ((*p_page)->next) |