diff options
Diffstat (limited to 'py/asmthumb.c')
| -rw-r--r-- | py/asmthumb.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/py/asmthumb.c b/py/asmthumb.c index 9e3a9abe25..891947567b 100644 --- a/py/asmthumb.c +++ b/py/asmthumb.c @@ -46,7 +46,7 @@ struct _asm_thumb_t { uint code_offset; uint code_size; byte *code_base; - byte dummy_data[8]; + byte dummy_data[4]; uint max_num_labels; int *label_offsets; @@ -113,6 +113,7 @@ void asm_thumb_end_pass(asm_thumb_t *as) { } // all functions must go through this one to emit bytes +// if as->pass < ASM_THUMB_PASS_EMIT, then this function only returns a buffer of 4 bytes length STATIC byte *asm_thumb_get_cur_to_write_bytes(asm_thumb_t *as, int num_bytes_to_write) { //printf("emit %d\n", num_bytes_to_write); if (as->pass < ASM_THUMB_PASS_EMIT) { @@ -251,10 +252,13 @@ void asm_thumb_align(asm_thumb_t* as, uint align) { void asm_thumb_data(asm_thumb_t* as, uint bytesize, uint val) { byte *c = asm_thumb_get_cur_to_write_bytes(as, bytesize); - // little endian - for (uint i = 0; i < bytesize; i++) { - *c++ = val; - val >>= 8; + // only write to the buffer in the emit pass (otherwise we overflow dummy_data) + if (as->pass == ASM_THUMB_PASS_EMIT) { + // little endian + for (uint i = 0; i < bytesize; i++) { + *c++ = val; + val >>= 8; + } } } |