diff options
Diffstat (limited to 'Zend/zend_alloc.c')
| -rw-r--r-- | Zend/zend_alloc.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/Zend/zend_alloc.c b/Zend/zend_alloc.c index 605e39646..596c2498b 100644 --- a/Zend/zend_alloc.c +++ b/Zend/zend_alloc.c @@ -672,7 +672,7 @@ static inline unsigned int zend_mm_high_bit(size_t _size) #elif defined(__GNUC__) && defined(__x86_64__) unsigned long n; - __asm__("bsrq %1,%0\n\t" : "=r" (n) : "rm" (_size)); + __asm__("bsr %1,%0\n\t" : "=r" (n) : "rm" (_size)); return (unsigned int)n; #elif defined(_MSC_VER) && defined(_M_IX86) __asm { @@ -698,12 +698,12 @@ static inline unsigned int zend_mm_low_bit(size_t _size) #elif defined(__GNUC__) && defined(__x86_64__) unsigned long n; - __asm__("bsfq %1,%0\n\t" : "=r" (n) : "rm" (_size)); + __asm__("bsf %1,%0\n\t" : "=r" (n) : "rm" (_size)); return (unsigned int)n; #elif defined(_MSC_VER) && defined(_M_IX86) __asm { bsf eax, _size - } + } #else static const int offset[16] = {4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0}; unsigned int n; @@ -2461,7 +2461,7 @@ static inline size_t safe_address(size_t nmemb, size_t size, size_t offset) size_t res = nmemb; unsigned long overflow = 0; - __asm__ ("mull %3\n\taddl %4,%0\n\tadcl %1,%1" + __asm__ ("mull %3\n\taddl %4,%0\n\tadcl $0,%1" : "=&a"(res), "=&d" (overflow) : "%0"(res), "rm"(size), @@ -2481,12 +2481,22 @@ static inline size_t safe_address(size_t nmemb, size_t size, size_t offset) size_t res = nmemb; unsigned long overflow = 0; - __asm__ ("mulq %3\n\taddq %4,%0\n\tadcq %1,%1" +#ifdef __ILP32__ /* x32 */ +# define LP_SUFF "l" +#else /* amd64 */ +# define LP_SUFF "q" +#endif + + __asm__ ("mul" LP_SUFF " %3\n\t" + "add %4,%0\n\t" + "adc $0,%1" : "=&a"(res), "=&d" (overflow) : "%0"(res), "rm"(size), "rm"(offset)); +#undef LP_SUFF + if (UNEXPECTED(overflow)) { zend_error_noreturn(E_ERROR, "Possible integer overflow in memory allocation (%zu * %zu + %zu)", nmemb, size, offset); return 0; |