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[PPC64, Sanitizers] Proper stack frame for the thread spawned in internal_clone

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Summary:
Set up the proper stack frame for the thread spawned in internal_clone,
the current code does not follow ABI (and causes SEGV trying to use this
malformed frame).

Reviewers: wschmidt

Subscribers: kubamracek, llvm-commits

Differential Revision: https://reviews.llvm.org/D31555

llvm-svn: 299896
This commit is contained in:
Alex Shlyapnikov 2017-04-10 23:24:50 +00:00
parent f58a30236b
commit 4d240da94b
1 changed files with 51 additions and 24 deletions
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75
compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
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@ -1113,36 +1113,50 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
int *parent_tidptr, void *newtls, int *child_tidptr) {
long long res;
/* Stack frame offsets. */
#if _CALL_ELF != 2
#define FRAME_MIN_SIZE 112
#define FRAME_TOC_SAVE 40
// Stack frame structure.
#if SANITIZER_PPC64V1
// Back chain == 0 (SP + 112)
// Frame (112 bytes):
// Parameter save area (SP + 48), 8 doublewords
// TOC save area (SP + 40)
// Link editor doubleword (SP + 32)
// Compiler doubleword (SP + 24)
// LR save area (SP + 16)
// CR save area (SP + 8)
// Back chain (SP + 0)
# define FRAME_SIZE 112
# define FRAME_TOC_SAVE_OFFSET 40
#elif SANITIZER_PPC64V2
// Back chain == 0 (SP + 32)
// Frame (32 bytes):
// TOC save area (SP + 24)
// LR save area (SP + 16)
// CR save area (SP + 8)
// Back chain (SP + 0)
# define FRAME_SIZE 32
# define FRAME_TOC_SAVE_OFFSET 24
#else
#define FRAME_MIN_SIZE 32
#define FRAME_TOC_SAVE 24
# error "Unsupported PPC64 ABI"
#endif
if (!fn || !child_stack)
return -EINVAL;
CHECK_EQ(0, (uptr)child_stack % 16);
child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
((unsigned long long *)child_stack)[0] = (uptr)fn;
((unsigned long long *)child_stack)[1] = (uptr)arg;
register int (*__fn)(void *) __asm__("r3") = fn;
register void *__cstack __asm__("r4") = child_stack;
register int __flags __asm__("r5") = flags;
register void * __arg __asm__("r6") = arg;
register int * __ptidptr __asm__("r7") = parent_tidptr;
register void * __newtls __asm__("r8") = newtls;
register int * __ctidptr __asm__("r9") = child_tidptr;
register void *__arg __asm__("r6") = arg;
register int *__ptidptr __asm__("r7") = parent_tidptr;
register void *__newtls __asm__("r8") = newtls;
register int *__ctidptr __asm__("r9") = child_tidptr;
__asm__ __volatile__(
/* fn, arg, child_stack are saved acrVoss the syscall */
/* fn and arg are saved across the syscall */
"mr 28, %5\n\t"
"mr 29, %6\n\t"
"mr 27, %8\n\t"
/* syscall
r0 == __NR_clone
r3 == flags
r4 == child_stack
r5 == parent_tidptr
@ -1160,15 +1174,21 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
"crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t"
"bne- cr1, 1f\n\t"
/* Set up stack frame */
"li 29, 0\n\t"
"stdu 29, -8(1)\n\t"
"stdu 1, -%12(1)\n\t"
/* Do the function call */
"std 2, %13(1)\n\t"
#if _CALL_ELF != 2
#if SANITIZER_PPC64V1
"ld 0, 0(28)\n\t"
"ld 2, 8(28)\n\t"
"mtctr 0\n\t"
#else
#elif SANITIZER_PPC64V2
"mr 12, 28\n\t"
"mtctr 12\n\t"
#else
# error "Unsupported PPC64 ABI"
#endif
"mr 3, 27\n\t"
"bctrl\n\t"
@ -1182,13 +1202,20 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
"1:\n\t"
"mr %0, 3\n\t"
: "=r" (res)
: "0" (-1), "i" (EINVAL),
"i" (__NR_clone), "i" (__NR_exit),
"r" (__fn), "r" (__cstack), "r" (__flags),
"r" (__arg), "r" (__ptidptr), "r" (__newtls),
"r" (__ctidptr), "i" (FRAME_MIN_SIZE), "i" (FRAME_TOC_SAVE)
: "cr0", "cr1", "memory", "ctr",
"r0", "r29", "r27", "r28");
: "0" (-1),
"i" (EINVAL),
"i" (__NR_clone),
"i" (__NR_exit),
"r" (__fn),
"r" (__cstack),
"r" (__flags),
"r" (__arg),
"r" (__ptidptr),
"r" (__newtls),
"r" (__ctidptr),
"i" (FRAME_SIZE),
"i" (FRAME_TOC_SAVE_OFFSET)
: "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29");
return res;
}
#elif defined(__i386__) && SANITIZER_LINUX