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added local bound generation

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This commit is contained in:
bellard 2002-01-05 16:16:47 +00:00
parent 5f85585b77
commit 7e51b6607d
1 changed files with 78 additions and 22 deletions
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100
bcheck.c
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@ -56,14 +56,18 @@ void __bound_init(void);
void __bound_new_region(void *p, unsigned long size); void __bound_new_region(void *p, unsigned long size);
void __bound_delete_region(void *p); void __bound_delete_region(void *p);
/* currently, tcc cannot compile that because we use GNUC extensions */ /* currently, tcc cannot compile that because we use unsupported GNUC
extensions */
#if !defined(__TINYC__) #if !defined(__TINYC__)
void *__bound_ptr_add(void *p, int offset) __attribute__((regparm(2))); void *__bound_ptr_add(void *p, int offset) __attribute__((regparm(2)));
char __bound_ptr_indir_b(void *p, int offset) __attribute__((regparm(2))); void *__bound_ptr_indir1(void *p, int offset) __attribute__((regparm(2)));
unsigned char __bound_ptr_indir_ub(void *p, int offset) __attribute__((regparm(2))); void *__bound_ptr_indir2(void *p, int offset) __attribute__((regparm(2)));
short __bound_ptr_indir_w(void *p, int offset) __attribute__((regparm(2))); void *__bound_ptr_indir4(void *p, int offset) __attribute__((regparm(2)));
unsigned short __bound_ptr_indir_uw(void *p, int offset) __attribute__((regparm(2))); void *__bound_ptr_indir8(void *p, int offset) __attribute__((regparm(2)));
int __bound_ptr_indir_i(void *p, int offset) __attribute((regparm(2))); void *__bound_ptr_indir12(void *p, int offset) __attribute__((regparm(2)));
void *__bound_ptr_indir16(void *p, int offset) __attribute__((regparm(2)));
void __bound_local_new(void *p) __attribute__((regparm(1)));
void __bound_local_delete(void *p) __attribute__((regparm(1)));
#endif #endif
void *__bound_malloc(size_t size, const void *caller); void *__bound_malloc(size_t size, const void *caller);
@ -137,7 +141,8 @@ static void bound_alloc_error(void)
/* currently, tcc cannot compile that because we use GNUC extensions */ /* currently, tcc cannot compile that because we use GNUC extensions */
#if !defined(__TINYC__) #if !defined(__TINYC__)
/* do: return (p + offset); */ /* return '(p + offset)' for pointer arithmetic (a pointer can reach
the end of a region in this case */
void *__bound_ptr_add(void *p, int offset) void *__bound_ptr_add(void *p, int offset)
{ {
unsigned long addr = (unsigned long)p; unsigned long addr = (unsigned long)p;
@ -161,9 +166,10 @@ void *__bound_ptr_add(void *p, int offset)
return p + offset; return p + offset;
} }
/* do: return *(type *)(p + offset); */ /* return '(p + offset)' for pointer indirection (the resulting must
#define BOUND_PTR_INDIR(suffix, type) \ be strictly inside the region */
type __bound_ptr_indir_ ## suffix (void *p, int offset) \ #define BOUND_PTR_INDIR(dsize) \
void *__bound_ptr_indir ## dsize (void *p, int offset) \
{ \ { \
unsigned long addr = (unsigned long)p; \ unsigned long addr = (unsigned long)p; \
BoundEntry *e; \ BoundEntry *e; \
@ -177,32 +183,82 @@ type __bound_ptr_indir_ ## suffix (void *p, int offset) \
e = __bound_find_region(e, p); \ e = __bound_find_region(e, p); \
addr = (unsigned long)p - e->start; \ addr = (unsigned long)p - e->start; \
} \ } \
addr += offset + sizeof(type); \ addr += offset + dsize; \
if (addr > e->size) \ if (addr > e->size) \
bound_error("dereferencing invalid pointer"); \ return INVALID_POINTER; /* return an invalid pointer */ \
return *(type *)(p + offset); \ return p + offset; \
}
#ifdef __i386__
#define GET_CALLER_FP(fp)\
{\
unsigned long *fp1;\
__asm__ __volatile__ ("movl %%ebp,%0" :"=g" (fp1));\
fp = fp1[0];\
}
#else
#error put code to extract the calling frame pointer
#endif
/* called when entering a function to add all the local regions */
void __bound_local_new(void *p1)
{
unsigned long addr, size, fp, *p = p1;
GET_CALLER_FP(fp);
for(;;) {
addr = p[0];
if (addr == 0)
break;
addr += fp;
size = p[1];
p += 2;
__bound_new_region((void *)addr, size);
}
}
/* called when leaving a function to delete all the local regions */
void __bound_local_delete(void *p1)
{
unsigned long addr, fp, *p = p1;
GET_CALLER_FP(fp);
for(;;) {
addr = p[0];
if (addr == 0)
break;
addr += fp;
p += 2;
__bound_delete_region((void *)addr);
}
} }
#else #else
void __bound_local_new(void *p)
{
}
void __bound_local_delete(void *p)
{
}
void *__bound_ptr_add(void *p, int offset) void *__bound_ptr_add(void *p, int offset)
{ {
return p + offset; return p + offset;
} }
#define BOUND_PTR_INDIR(suffix, type) \ #define BOUND_PTR_INDIR(dsize) \
type __bound_ptr_indir_ ## suffix (void *p, int offset) \ void *__bound_ptr_indir ## dsize (void *p, int offset) \
{ \ { \
return *(type *)(p + offset); \ return p + offset; \
} }
#endif #endif
BOUND_PTR_INDIR(b, char) BOUND_PTR_INDIR(1)
BOUND_PTR_INDIR(ub, unsigned char) BOUND_PTR_INDIR(2)
BOUND_PTR_INDIR(w, short) BOUND_PTR_INDIR(4)
BOUND_PTR_INDIR(uw, unsigned short) BOUND_PTR_INDIR(8)
BOUND_PTR_INDIR(i, int) BOUND_PTR_INDIR(12)
BOUND_PTR_INDIR(16)
static BoundEntry *__bound_new_page(void) static BoundEntry *__bound_new_page(void)
{ {