[PATCH] ntdll: Implement __C_specific_handler and _local_unwind for arm64
Martin Storsjo
martin at martin.st
Thu Sep 17 03:04:48 CDT 2020
The __C_specific_handler function is based on the existing one for
x86_64, but with a few small changes:
- The TargetIp field in DISPATCHER_CONTEXT is renamed to TargetPc
- The handler/filter functions are called via wrapper functions that
set up the nonvolatile registers before calling them
- Adjust ControlPc backwards if ControlPcIsUnwound is set
Signed-off-by: Martin Storsjo <martin at martin.st>
---
.../api-ms-win-crt-private-l1-1-0.spec | 4 +-
dlls/ntdll/ntdll.spec | 4 +-
dlls/ntdll/signal_arm64.c | 174 ++++++++++++++++++
dlls/ucrtbase/ucrtbase.spec | 4 +-
dlls/vcruntime140/vcruntime140.spec | 4 +-
5 files changed, 182 insertions(+), 8 deletions(-)
diff --git a/dlls/api-ms-win-crt-private-l1-1-0/api-ms-win-crt-private-l1-1-0.spec b/dlls/api-ms-win-crt-private-l1-1-0/api-ms-win-crt-private-l1-1-0.spec
index f74cea4e14c..f9cfe67c1b0 100644
--- a/dlls/api-ms-win-crt-private-l1-1-0/api-ms-win-crt-private-l1-1-0.spec
+++ b/dlls/api-ms-win-crt-private-l1-1-0/api-ms-win-crt-private-l1-1-0.spec
@@ -14,7 +14,7 @@
@ cdecl __AdjustPointer(ptr ptr) ucrtbase.__AdjustPointer
@ stub __BuildCatchObject
@ stub __BuildCatchObjectHelper
-@ stdcall -arch=x86_64 __C_specific_handler(ptr long ptr ptr) ucrtbase.__C_specific_handler
+@ stdcall -arch=x86_64,arm64 __C_specific_handler(ptr long ptr ptr) ucrtbase.__C_specific_handler
@ stub __C_specific_handler_noexcept
@ cdecl -arch=i386,x86_64,arm,arm64 __CxxDetectRethrow(ptr) ucrtbase.__CxxDetectRethrow
@ cdecl -arch=i386,x86_64,arm,arm64 __CxxExceptionFilter(ptr ptr long ptr) ucrtbase.__CxxExceptionFilter
@@ -62,7 +62,7 @@
@ cdecl _get_unexpected() ucrtbase._get_unexpected
@ cdecl -arch=i386 _global_unwind2(ptr) ucrtbase._global_unwind2
@ stub _is_exception_typeof
-@ cdecl -arch=x86_64 _local_unwind(ptr ptr) ucrtbase._local_unwind
+@ cdecl -arch=x86_64,arm64 _local_unwind(ptr ptr) ucrtbase._local_unwind
@ cdecl -arch=i386 _local_unwind2(ptr long) ucrtbase._local_unwind2
@ cdecl -arch=i386 _local_unwind4(ptr ptr long) ucrtbase._local_unwind4
@ cdecl -arch=i386 _longjmpex(ptr long) ucrtbase._longjmpex
diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 453c4827572..af1fac8df8e 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -1437,7 +1437,7 @@
@ cdecl -private -arch=i386 _CIpow()
@ cdecl -private -arch=i386 _CIsin()
@ cdecl -private -arch=i386 _CIsqrt()
-@ stdcall -arch=x86_64 __C_specific_handler(ptr long ptr ptr)
+@ stdcall -arch=x86_64,arm64 __C_specific_handler(ptr long ptr ptr)
@ cdecl -arch=arm,x86_64 -norelay __chkstk()
@ cdecl __isascii(long)
@ cdecl __iscsym(long)
@@ -1463,7 +1463,7 @@
@ cdecl _itoa(long ptr long)
@ cdecl _itow(long ptr long)
@ cdecl _lfind(ptr ptr ptr long ptr)
-@ stdcall -arch=x86_64 _local_unwind(ptr ptr)
+@ stdcall -arch=x86_64,arm64 _local_unwind(ptr ptr)
@ cdecl _ltoa(long ptr long)
@ cdecl _ltow(long ptr long)
@ cdecl _memccpy(ptr ptr long long)
diff --git a/dlls/ntdll/signal_arm64.c b/dlls/ntdll/signal_arm64.c
index 2335a6cc0a8..d585fe0d93c 100644
--- a/dlls/ntdll/signal_arm64.c
+++ b/dlls/ntdll/signal_arm64.c
@@ -39,6 +39,19 @@
WINE_DEFAULT_DEBUG_CHANNEL(seh);
+typedef struct _SCOPE_TABLE
+{
+ ULONG Count;
+ struct
+ {
+ ULONG BeginAddress;
+ ULONG EndAddress;
+ ULONG HandlerAddress;
+ ULONG JumpTarget;
+ } ScopeRecord[1];
+} SCOPE_TABLE, *PSCOPE_TABLE;
+
+
/* layering violation: the setjmp buffer is defined in msvcrt, but used by RtlUnwindEx */
struct MSVCRT_JUMP_BUFFER
{
@@ -63,6 +76,19 @@ struct MSVCRT_JUMP_BUFFER
};
+static void dump_scope_table( ULONG64 base, const SCOPE_TABLE *table )
+{
+ unsigned int i;
+
+ TRACE( "scope table at %p\n", table );
+ for (i = 0; i < table->Count; i++)
+ TRACE( " %u: %lx-%lx handler %lx target %lx\n", i,
+ base + table->ScopeRecord[i].BeginAddress,
+ base + table->ScopeRecord[i].EndAddress,
+ base + table->ScopeRecord[i].HandlerAddress,
+ base + table->ScopeRecord[i].JumpTarget );
+}
+
/*******************************************************************
* is_valid_frame
*/
@@ -1225,6 +1251,154 @@ void WINAPI RtlUnwind( void *frame, void *target_ip, EXCEPTION_RECORD *rec, void
RtlUnwindEx( frame, target_ip, rec, retval, &context, NULL );
}
+/*******************************************************************
+ * _local_unwind (NTDLL.@)
+ */
+void WINAPI _local_unwind( void *frame, void *target_ip )
+{
+ CONTEXT context;
+ RtlUnwindEx( frame, target_ip, NULL, NULL, &context, NULL );
+}
+
+extern LONG __C_ExecuteExceptionFilter(PEXCEPTION_POINTERS ptrs, PVOID frame,
+ PEXCEPTION_FILTER filter,
+ PUCHAR nonvolatile);
+__ASM_GLOBAL_FUNC( __C_ExecuteExceptionFilter,
+ "stp x29, x30, [sp, #-96]!\n\t"
+ __ASM_SEH(".seh_save_fplr_x 96\n\t")
+ "stp x19, x20, [sp, #16]\n\t"
+ __ASM_SEH(".seh_save_regp x19, 16\n\t")
+ "stp x21, x22, [sp, #32]\n\t"
+ __ASM_SEH(".seh_save_regp x21, 32\n\t")
+ "stp x23, x24, [sp, #48]\n\t"
+ __ASM_SEH(".seh_save_regp x23, 48\n\t")
+ "stp x25, x26, [sp, #64]\n\t"
+ __ASM_SEH(".seh_save_regp x25, 64\n\t")
+ "stp x27, x28, [sp, #80]\n\t"
+ __ASM_SEH(".seh_save_regp x27, 80\n\t")
+ "mov x29, sp\n\t"
+ __ASM_SEH(".seh_set_fp\n\t")
+ __ASM_SEH(".seh_endprologue\n\t")
+
+ __ASM_CFI(".cfi_def_cfa x29, 96\n\t")
+ __ASM_CFI(".cfi_offset x29, -96\n\t")
+ __ASM_CFI(".cfi_offset x30, -88\n\t")
+ __ASM_CFI(".cfi_offset x19, -80\n\t")
+ __ASM_CFI(".cfi_offset x20, -72\n\t")
+ __ASM_CFI(".cfi_offset x21, -64\n\t")
+ __ASM_CFI(".cfi_offset x22, -56\n\t")
+ __ASM_CFI(".cfi_offset x23, -48\n\t")
+ __ASM_CFI(".cfi_offset x24, -40\n\t")
+ __ASM_CFI(".cfi_offset x25, -32\n\t")
+ __ASM_CFI(".cfi_offset x26, -24\n\t")
+ __ASM_CFI(".cfi_offset x27, -16\n\t")
+ __ASM_CFI(".cfi_offset x28, -8\n\t")
+
+ "ldp x19, x20, [x3, #0]\n\t"
+ "ldp x21, x22, [x3, #16]\n\t"
+ "ldp x23, x24, [x3, #32]\n\t"
+ "ldp x25, x26, [x3, #48]\n\t"
+ "ldp x27, x28, [x3, #64]\n\t"
+ /* Overwrite the frame parameter with Fp from the
+ * nonvolatile regs */
+ "ldr x1, [x3, #80]\n\t"
+ "blr x2\n\t"
+ "ldp x19, x20, [sp, #16]\n\t"
+ "ldp x21, x22, [sp, #32]\n\t"
+ "ldp x23, x24, [sp, #48]\n\t"
+ "ldp x25, x26, [sp, #64]\n\t"
+ "ldp x27, x28, [sp, #80]\n\t"
+ "ldp x29, x30, [sp], #96\n\t"
+ "ret")
+
+extern void __C_ExecuteTerminationHandler(BOOL abnormal, PVOID frame,
+ PTERMINATION_HANDLER handler,
+ PUCHAR nonvolatile);
+/* This is, implementation wise, identical to __C_ExecuteExceptionFilter. */
+__ASM_GLOBAL_FUNC( __C_ExecuteTerminationHandler,
+ "b " __ASM_NAME("__C_ExecuteExceptionFilter") "\n\t");
+
+/*******************************************************************
+ * __C_specific_handler (NTDLL.@)
+ */
+EXCEPTION_DISPOSITION WINAPI __C_specific_handler( EXCEPTION_RECORD *rec,
+ void *frame,
+ CONTEXT *context,
+ struct _DISPATCHER_CONTEXT *dispatch )
+{
+ SCOPE_TABLE *table = dispatch->HandlerData;
+ ULONG i;
+ DWORD64 ControlPc = dispatch->ControlPc;
+
+ TRACE( "%p %p %p %p\n", rec, frame, context, dispatch );
+ if (TRACE_ON(seh)) dump_scope_table( dispatch->ImageBase, table );
+
+ if (dispatch->ControlPcIsUnwound)
+ ControlPc -= 4;
+
+ if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
+ {
+ for (i = dispatch->ScopeIndex; i < table->Count; i++)
+ {
+ if (ControlPc >= dispatch->ImageBase + table->ScopeRecord[i].BeginAddress &&
+ ControlPc < dispatch->ImageBase + table->ScopeRecord[i].EndAddress)
+ {
+ PTERMINATION_HANDLER handler;
+
+ if (table->ScopeRecord[i].JumpTarget) continue;
+
+ if (rec->ExceptionFlags & EH_TARGET_UNWIND &&
+ dispatch->TargetPc >= dispatch->ImageBase + table->ScopeRecord[i].BeginAddress &&
+ dispatch->TargetPc < dispatch->ImageBase + table->ScopeRecord[i].EndAddress)
+ {
+ break;
+ }
+
+ handler = (PTERMINATION_HANDLER)(dispatch->ImageBase + table->ScopeRecord[i].HandlerAddress);
+ dispatch->ScopeIndex = i+1;
+
+ TRACE( "calling __finally %p frame %p\n", handler, frame );
+ __C_ExecuteTerminationHandler( TRUE, frame, handler,
+ dispatch->NonVolatileRegisters );
+ }
+ }
+ return ExceptionContinueSearch;
+ }
+
+ for (i = dispatch->ScopeIndex; i < table->Count; i++)
+ {
+ if (ControlPc >= dispatch->ImageBase + table->ScopeRecord[i].BeginAddress &&
+ ControlPc < dispatch->ImageBase + table->ScopeRecord[i].EndAddress)
+ {
+ if (!table->ScopeRecord[i].JumpTarget) continue;
+ if (table->ScopeRecord[i].HandlerAddress != EXCEPTION_EXECUTE_HANDLER)
+ {
+ EXCEPTION_POINTERS ptrs;
+ PEXCEPTION_FILTER filter;
+
+ filter = (PEXCEPTION_FILTER)(dispatch->ImageBase + table->ScopeRecord[i].HandlerAddress);
+ ptrs.ExceptionRecord = rec;
+ ptrs.ContextRecord = context;
+ TRACE( "calling filter %p ptrs %p frame %p\n", filter, &ptrs, frame );
+ switch (__C_ExecuteExceptionFilter( &ptrs, frame, filter,
+ dispatch->NonVolatileRegisters ))
+ {
+ case EXCEPTION_EXECUTE_HANDLER:
+ break;
+ case EXCEPTION_CONTINUE_SEARCH:
+ continue;
+ case EXCEPTION_CONTINUE_EXECUTION:
+ return ExceptionContinueExecution;
+ }
+ }
+ TRACE( "unwinding to target %lx\n", dispatch->ImageBase + table->ScopeRecord[i].JumpTarget );
+ RtlUnwindEx( frame, (char *)dispatch->ImageBase + table->ScopeRecord[i].JumpTarget,
+ rec, 0, dispatch->ContextRecord, dispatch->HistoryTable );
+ }
+ }
+ return ExceptionContinueSearch;
+}
+
/***********************************************************************
* RtlRaiseException (NTDLL.@)
diff --git a/dlls/ucrtbase/ucrtbase.spec b/dlls/ucrtbase/ucrtbase.spec
index 05ac3d3427a..4981d7fbac7 100644
--- a/dlls/ucrtbase/ucrtbase.spec
+++ b/dlls/ucrtbase/ucrtbase.spec
@@ -48,7 +48,7 @@
@ cdecl __AdjustPointer(ptr ptr)
@ stub __BuildCatchObject
@ stub __BuildCatchObjectHelper
-@ stdcall -arch=x86_64 __C_specific_handler(ptr long ptr ptr) ntdll.__C_specific_handler
+@ stdcall -arch=x86_64,arm64 __C_specific_handler(ptr long ptr ptr) ntdll.__C_specific_handler
@ cdecl -arch=i386,x86_64,arm,arm64 __CxxDetectRethrow(ptr)
@ cdecl -arch=i386,x86_64,arm,arm64 __CxxExceptionFilter(ptr ptr long ptr)
@ cdecl -arch=i386,x86_64,arm,arm64 -norelay __CxxFrameHandler(ptr ptr ptr ptr)
@@ -555,7 +555,7 @@
@ cdecl -arch=i386 -norelay _libm_sse2_sqrt_precise() MSVCRT___libm_sse2_sqrt_precise
@ cdecl -arch=i386 -norelay _libm_sse2_tan_precise() MSVCRT___libm_sse2_tan
@ cdecl _loaddll(str)
-@ cdecl -arch=x86_64 _local_unwind(ptr ptr)
+@ cdecl -arch=x86_64,arm64 _local_unwind(ptr ptr)
@ cdecl -arch=i386 _local_unwind2(ptr long)
@ cdecl -arch=i386 _local_unwind4(ptr ptr long)
@ cdecl _localtime32(ptr) MSVCRT__localtime32
diff --git a/dlls/vcruntime140/vcruntime140.spec b/dlls/vcruntime140/vcruntime140.spec
index 45d9370c86a..f799bcd4db5 100644
--- a/dlls/vcruntime140/vcruntime140.spec
+++ b/dlls/vcruntime140/vcruntime140.spec
@@ -10,7 +10,7 @@
@ cdecl __AdjustPointer(ptr ptr) ucrtbase.__AdjustPointer
@ stub __BuildCatchObject
@ stub __BuildCatchObjectHelper
-@ stdcall -arch=x86_64 __C_specific_handler(ptr long ptr ptr) ucrtbase.__C_specific_handler
+@ stdcall -arch=x86_64,arm64 __C_specific_handler(ptr long ptr ptr) ucrtbase.__C_specific_handler
@ stub __C_specific_handler_noexcept
@ cdecl -arch=i386,x86_64,arm,arm64 __CxxDetectRethrow(ptr) ucrtbase.__CxxDetectRethrow
@ cdecl -arch=i386,x86_64,arm,arm64 __CxxExceptionFilter(ptr ptr long ptr) ucrtbase.__CxxExceptionFilter
@@ -64,7 +64,7 @@
@ cdecl -arch=i386 _local_unwind2(ptr long) ucrtbase._local_unwind2
@ cdecl -arch=i386 _local_unwind4(ptr ptr long) ucrtbase._local_unwind4
@ cdecl -arch=i386 _longjmpex(ptr long) ucrtbase._longjmpex
-@ cdecl -arch=x86_64 _local_unwind(ptr ptr) ucrtbase._local_unwind
+@ cdecl -arch=x86_64,arm64 _local_unwind(ptr ptr) ucrtbase._local_unwind
@ cdecl _purecall() ucrtbase._purecall
@ stdcall -arch=i386 _seh_longjmp_unwind4(ptr) ucrtbase._seh_longjmp_unwind4
@ stdcall -arch=i386 _seh_longjmp_unwind(ptr) ucrtbase._seh_longjmp_unwind
--
2.17.1
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