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Fix unaligned access arm (openbsd)

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libtcc.c:
Fix unaligned load/store from magic3

tccgen.c:
For packed struct allways use single byte code
If field does not start at at align check it
Align stack correctly with vla
This commit is contained in:
herman ten brugge 2021-01-24 11:28:26 +01:00
parent 38eaf9b3a7
commit 5043268cb1
2 changed files with 20 additions and 8 deletions
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18
libtcc.c
View File

@ -273,12 +273,20 @@ PUB_FUNC char *tcc_strdup(const char *str)
#define MEM_DEBUG_MAGIC2 0xFEEDDEB2
#define MEM_DEBUG_MAGIC3 0xFEEDDEB3
#define MEM_DEBUG_FILE_LEN 40
#define MEM_DEBUG_OFF3 offsetof(mem_debug_header_t, magic3)
#define MEM_DEBUG_CHECK3(header) \
((mem_debug_header_t*)((char*)header + header->size))->magic3
({unsigned magic3; \
memcpy(&magic3, (char*)header + MEM_DEBUG_OFF3 + header->size, \
sizeof (magic3)); \
magic3;})
#define MEM_DEBUG_SET3(header) \
{unsigned magic3 = MEM_DEBUG_MAGIC3; \
memcpy((char*)header + MEM_DEBUG_OFF3 + header->size, &magic3, \
sizeof (magic3));}
#define MEM_USER_PTR(header) \
((char *)header + offsetof(mem_debug_header_t, magic3))
((char *)header + MEM_DEBUG_OFF3)
#define MEM_HEADER_PTR(ptr) \
(mem_debug_header_t *)((char*)ptr - offsetof(mem_debug_header_t, magic3))
(mem_debug_header_t *)((char*)ptr - MEM_DEBUG_OFF3)
struct mem_debug_header {
unsigned magic1;
@ -325,7 +333,7 @@ PUB_FUNC void *tcc_malloc_debug(unsigned long size, const char *file, int line)
header->magic1 = MEM_DEBUG_MAGIC1;
header->magic2 = MEM_DEBUG_MAGIC2;
header->size = size;
MEM_DEBUG_CHECK3(header) = MEM_DEBUG_MAGIC3;
MEM_DEBUG_SET3(header);
header->line_num = line;
ofs = strlen(file) - MEM_DEBUG_FILE_LEN;
strncpy(header->file_name, file + (ofs > 0 ? ofs : 0), MEM_DEBUG_FILE_LEN);
@ -382,7 +390,7 @@ PUB_FUNC void *tcc_realloc_debug(void *ptr, unsigned long size, const char *file
if (!header)
_tcc_error("memory full (realloc)");
header->size = size;
MEM_DEBUG_CHECK3(header) = MEM_DEBUG_MAGIC3;
MEM_DEBUG_SET3(header);
if (header->next)
header->next->prev = header;
if (header->prev)

10
tccgen.c
View File

@ -4727,7 +4727,10 @@ static void struct_layout(CType *type, AttributeDef *ad)
continue;
bit_pos = BIT_POS(f->type.t);
size = type_size(&f->type, &align);
if (bit_pos + bit_size <= size * 8 && f->c + size <= c)
if (c & 3) /* packed struct */
goto single_byte;
if (bit_pos + bit_size <= size * 8 && f->c + size <= c &&
(f->c & (align - 1)) == 0)
continue;
/* try to access the field using a different type */
@ -4768,6 +4771,7 @@ static void struct_layout(CType *type, AttributeDef *ad)
cx, s, align, px, bit_size);
#endif
} else {
single_byte:
/* fall back to load/store single-byte wise */
f->auxtype = VT_STRUCT;
#ifdef BF_DEBUG
@ -8269,7 +8273,7 @@ static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
#ifdef CONFIG_TCC_BCHECK
if (bcheck && v) {
/* add padding between stack variables for bound checking */
loc--;
loc -= align;
}
#endif
loc = (loc - size) & -align;
@ -8278,7 +8282,7 @@ static void decl_initializer_alloc(CType *type, AttributeDef *ad, int r,
#ifdef CONFIG_TCC_BCHECK
if (bcheck && v) {
/* add padding between stack variables for bound checking */
loc--;
loc -= align;
}
#endif
if (v) {