Alexandre Julliard : ntdll: Use the exception fault code to detect write access on ARM64.
Alexandre Julliard
julliard at winehq.org
Tue Aug 13 14:54:34 CDT 2019
Module: wine
Branch: master
Commit: 85c01202ac70af0c83f894d7a8986adf66983459
URL: https://source.winehq.org/git/wine.git/?a=commit;h=85c01202ac70af0c83f894d7a8986adf66983459
Author: Alexandre Julliard <julliard at winehq.org>
Date: Tue Aug 13 14:47:17 2019 +0200
ntdll: Use the exception fault code to detect write access on ARM64.
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/ntdll/signal_arm64.c | 27 ++++++++-------------------
1 file changed, 8 insertions(+), 19 deletions(-)
diff --git a/dlls/ntdll/signal_arm64.c b/dlls/ntdll/signal_arm64.c
index 2b5e1f1..9643beb 100644
--- a/dlls/ntdll/signal_arm64.c
+++ b/dlls/ntdll/signal_arm64.c
@@ -97,6 +97,13 @@ static struct fpsimd_context *get_fpsimd_context( ucontext_t *sigcontext )
return (struct fpsimd_context *)get_extended_sigcontext( sigcontext, FPSIMD_MAGIC );
}
+static DWORD64 get_fault_esr( ucontext_t *sigcontext )
+{
+ struct esr_context *esr = (struct esr_context *)get_extended_sigcontext( sigcontext, ESR_MAGIC );
+ if (esr) return esr->esr;
+ return 0;
+}
+
#endif /* linux */
static const size_t teb_size = 0x2000; /* we reserve two pages for the TEB */
@@ -649,23 +656,6 @@ static NTSTATUS raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context, BOOL f
return STATUS_SUCCESS;
}
-static inline DWORD is_write_fault( DWORD *pc )
-{
- DWORD inst = *pc;
- if ((inst & 0xbfff0000) == 0x0c000000 /* C3.3.1 */ ||
- (inst & 0xbfe00000) == 0x0c800000 /* C3.3.2 */ ||
- (inst & 0xbfdf0000) == 0x0d000000 /* C3.3.3 */ ||
- (inst & 0xbfc00000) == 0x0d800000 /* C3.3.4 */ ||
- (inst & 0x3f400000) == 0x08000000 /* C3.3.6 */ ||
- (inst & 0x3bc00000) == 0x38000000 /* C3.3.8-12 */ ||
- (inst & 0x3fe00000) == 0x3c800000 /* C3.3.8-12 128bit */ ||
- (inst & 0x3bc00000) == 0x39000000 /* C3.3.13 */ ||
- (inst & 0x3fc00000) == 0x3d800000 /* C3.3.13 128bit */ ||
- (inst & 0x3a400000) == 0x28000000) /* C3.3.7,14-16 */
- return EXCEPTION_WRITE_FAULT;
- return EXCEPTION_READ_FAULT;
-}
-
/**********************************************************************
* segv_handler
*
@@ -675,7 +665,6 @@ static void segv_handler( int signal, siginfo_t *info, void *ucontext )
{
EXCEPTION_RECORD *rec;
ucontext_t *context = ucontext;
- DWORD *orig_pc = (DWORD *)PC_sig(context);
/* check for page fault inside the thread stack */
if (signal == SIGSEGV &&
@@ -703,7 +692,7 @@ static void segv_handler( int signal, siginfo_t *info, void *ucontext )
case SIGSEGV: /* Segmentation fault */
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
rec->NumberParameters = 2;
- rec->ExceptionInformation[0] = is_write_fault(orig_pc);
+ rec->ExceptionInformation[0] = (get_fault_esr( context ) & 0x40) != 0;
rec->ExceptionInformation[1] = (ULONG_PTR)info->si_addr;
break;
case SIGBUS: /* Alignment check exception */
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