[PATCH 05/18] ntdll: Implement RtlVirtualUnwind for arm.
Martin Storsjö
martin at martin.st
Tue Nov 9 08:05:42 CST 2021
Signed-off-by: Martin Storsjö <martin at martin.st>
---
.../api-ms-win-core-rtlsupport-l1-1-0.spec | 2 +-
.../api-ms-win-core-rtlsupport-l1-2-0.spec | 2 +-
dlls/kernel32/kernel32.spec | 2 +-
dlls/ntdll/ntdll.spec | 2 +-
dlls/ntdll/signal_arm.c | 524 ++++++++++++++++++
5 files changed, 528 insertions(+), 4 deletions(-)
diff --git a/dlls/api-ms-win-core-rtlsupport-l1-1-0/api-ms-win-core-rtlsupport-l1-1-0.spec b/dlls/api-ms-win-core-rtlsupport-l1-1-0/api-ms-win-core-rtlsupport-l1-1-0.spec
index ac166e2c541..fefac9dc400 100644
--- a/dlls/api-ms-win-core-rtlsupport-l1-1-0/api-ms-win-core-rtlsupport-l1-1-0.spec
+++ b/dlls/api-ms-win-core-rtlsupport-l1-1-0/api-ms-win-core-rtlsupport-l1-1-0.spec
@@ -12,4 +12,4 @@
@ cdecl -arch=arm64,x86_64 RtlRestoreContext(ptr ptr) ntdll.RtlRestoreContext
@ stdcall -norelay RtlUnwind(ptr ptr ptr ptr) ntdll.RtlUnwind
@ stdcall -arch=arm64,x86_64 RtlUnwindEx(ptr ptr ptr ptr ptr ptr) ntdll.RtlUnwindEx
-@ stdcall -arch=arm64,x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr) ntdll.RtlVirtualUnwind
+@ stdcall -arch=arm,arm64,x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr) ntdll.RtlVirtualUnwind
diff --git a/dlls/api-ms-win-core-rtlsupport-l1-2-0/api-ms-win-core-rtlsupport-l1-2-0.spec b/dlls/api-ms-win-core-rtlsupport-l1-2-0/api-ms-win-core-rtlsupport-l1-2-0.spec
index dd49448348d..bff03b1d2ae 100644
--- a/dlls/api-ms-win-core-rtlsupport-l1-2-0/api-ms-win-core-rtlsupport-l1-2-0.spec
+++ b/dlls/api-ms-win-core-rtlsupport-l1-2-0/api-ms-win-core-rtlsupport-l1-2-0.spec
@@ -13,4 +13,4 @@
@ cdecl -arch=arm64,x86_64 RtlRestoreContext(ptr ptr) ntdll.RtlRestoreContext
@ stdcall -norelay RtlUnwind(ptr ptr ptr ptr) ntdll.RtlUnwind
@ stdcall -arch=arm64,x86_64 RtlUnwindEx(ptr ptr ptr ptr ptr ptr) ntdll.RtlUnwindEx
-@ stdcall -arch=arm64,x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr) ntdll.RtlVirtualUnwind
+@ stdcall -arch=arm,arm64,x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr) ntdll.RtlVirtualUnwind
diff --git a/dlls/kernel32/kernel32.spec b/dlls/kernel32/kernel32.spec
index 13e4df3c99f..18ec187a683 100644
--- a/dlls/kernel32/kernel32.spec
+++ b/dlls/kernel32/kernel32.spec
@@ -1314,7 +1314,7 @@
@ cdecl -arch=arm64,x86_64 RtlRestoreContext(ptr ptr) ntdll.RtlRestoreContext
@ stdcall RtlUnwind(ptr ptr ptr long) ntdll.RtlUnwind
@ stdcall -arch=arm64,x86_64 RtlUnwindEx(long long ptr long ptr) ntdll.RtlUnwindEx
-@ stdcall -arch=arm64,x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr) ntdll.RtlVirtualUnwind
+@ stdcall -arch=arm,arm64,x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr) ntdll.RtlVirtualUnwind
@ stdcall RtlZeroMemory(ptr long) ntdll.RtlZeroMemory
@ stdcall -i386 -private -norelay SMapLS() krnl386.exe16.SMapLS
@ stdcall -i386 -private -norelay SMapLS_IP_EBP_12() krnl386.exe16.SMapLS_IP_EBP_12
diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 13e65f65139..070b57efb59 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -1067,7 +1067,7 @@
@ stub RtlValidateProcessHeaps
# @ stub RtlValidateUnicodeString
@ stdcall RtlVerifyVersionInfo(ptr long int64)
-@ stdcall -arch=arm64,x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr)
+@ stdcall -arch=arm,arm64,x86_64 RtlVirtualUnwind(long long long ptr ptr ptr ptr ptr)
@ stdcall RtlWaitOnAddress(ptr ptr long ptr)
@ stdcall RtlWakeAddressAll(ptr)
@ stdcall RtlWakeAddressSingle(ptr)
diff --git a/dlls/ntdll/signal_arm.c b/dlls/ntdll/signal_arm.c
index 0ef210a0331..27e27deabfe 100644
--- a/dlls/ntdll/signal_arm.c
+++ b/dlls/ntdll/signal_arm.c
@@ -217,6 +217,530 @@ void WINAPI KiUserCallbackDispatcher( ULONG id, void *args, ULONG len )
}
+/***********************************************************************
+ * Definitions for Win32 unwind tables
+ */
+
+struct unwind_info
+{
+ DWORD function_length : 18;
+ DWORD version : 2;
+ DWORD x : 1;
+ DWORD e : 1;
+ DWORD f : 1;
+ DWORD epilog : 5;
+ DWORD codes : 4;
+};
+
+struct unwind_info_ext
+{
+ WORD epilog;
+ BYTE codes;
+ BYTE reserved;
+};
+
+struct unwind_info_epilog
+{
+ DWORD offset : 18;
+ DWORD res : 2;
+ DWORD cond : 4;
+ DWORD index : 8;
+};
+
+static const BYTE unwind_code_len[256] =
+{
+/* 00 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+/* 20 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+/* 40 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+/* 60 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+/* 80 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+/* a0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+/* c0 */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
+/* e0 */ 1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,4,3,4,1,1,1,1,1
+};
+
+static const BYTE unwind_instr_len[256] =
+{
+/* 00 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+/* 20 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+/* 40 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+/* 60 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+/* 80 */ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+/* a0 */ 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
+/* c0 */ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,4,4,4,4,
+/* e0 */ 4,4,4,4,4,4,4,4,4,4,4,4,2,2,2,4,0,0,0,0,0,4,4,2,2,4,4,2,4,2,4,0
+};
+
+/***********************************************************************
+ * get_sequence_len
+ */
+static unsigned int get_sequence_len( BYTE *ptr, BYTE *end, int include_end )
+{
+ unsigned int ret = 0;
+
+ while (ptr < end)
+ {
+ if (*ptr >= 0xfd)
+ {
+ if (*ptr <= 0xfe && include_end)
+ ret += unwind_instr_len[*ptr];
+ break;
+ }
+ ret += unwind_instr_len[*ptr];
+ ptr += unwind_code_len[*ptr];
+ }
+ return ret;
+}
+
+
+/***********************************************************************
+ * pop_regs_mask
+ */
+static void pop_regs_mask( int mask, CONTEXT *context,
+ KNONVOLATILE_CONTEXT_POINTERS *ptrs )
+{
+ int i;
+ for (i = 0; i <= 12; i++)
+ {
+ if (!(mask & (1 << i))) continue;
+ if (ptrs && i >= 4 && i <= 11) (&ptrs->R4)[i - 4] = (DWORD *)context->Sp;
+ if (i >= 4) (&context->R0)[i] = *(DWORD *)context->Sp;
+ context->Sp += 4;
+ }
+}
+
+
+/***********************************************************************
+ * pop_regs_range
+ */
+static void pop_regs_range( int last, CONTEXT *context,
+ KNONVOLATILE_CONTEXT_POINTERS *ptrs )
+{
+ int i;
+ for (i = 4; i <= last; i++)
+ {
+ if (ptrs) (&ptrs->R4)[i - 4] = (DWORD *)context->Sp;
+ (&context->R0)[i] = *(DWORD *)context->Sp;
+ context->Sp += 4;
+ }
+}
+
+
+/***********************************************************************
+ * pop_lr
+ */
+static void pop_lr( int increment, CONTEXT *context,
+ KNONVOLATILE_CONTEXT_POINTERS *ptrs )
+{
+ if (ptrs) ptrs->Lr = (DWORD *)context->Sp;
+ context->Lr = *(DWORD *)context->Sp;
+ context->Sp += increment;
+}
+
+
+/***********************************************************************
+ * pop_fpregs_range
+ */
+static void pop_fpregs_range( int first, int last, CONTEXT *context,
+ KNONVOLATILE_CONTEXT_POINTERS *ptrs )
+{
+ int i;
+ for (i = first; i <= last; i++)
+ {
+ if (ptrs && i >= 8 && i <= 15) (&ptrs->D8)[i - 8] = (ULONGLONG *)context->Sp;
+ context->u.D[i] = *(ULONGLONG *)context->Sp;
+ context->Sp += 8;
+ }
+}
+
+
+/***********************************************************************
+ * process_unwind_codes
+ */
+static void process_unwind_codes( BYTE *ptr, BYTE *end, CONTEXT *context,
+ KNONVOLATILE_CONTEXT_POINTERS *ptrs, int skip )
+{
+ unsigned int val, len;
+ unsigned int i;
+
+ /* skip codes */
+ while (ptr < end && skip)
+ {
+ if (*ptr >= 0xfd) break;
+ skip -= unwind_instr_len[*ptr];
+ ptr += unwind_code_len[*ptr];
+ }
+
+ while (ptr < end)
+ {
+ len = unwind_code_len[*ptr];
+ if (ptr + len > end) break;
+ val = 0;
+ for (i = 0; i < len; i++)
+ val = (val << 8) | ptr[i];
+
+ if (*ptr <= 0x7f) /* add sp, sp, #x */
+ context->Sp += 4 * (val & 0x7f);
+ else if (*ptr <= 0xbf) /* pop {r0-r12,lr} */
+ {
+ pop_regs_mask( val & 0x1fff, context, ptrs );
+ if (val & 0x2000)
+ pop_lr( 4, context, ptrs );
+ }
+ else if (*ptr <= 0xcf) /* mov sp, rX */
+ context->Sp = (&context->R0)[val & 0x0f];
+ else if (*ptr <= 0xd7) /* pop {r4-rX,lr} */
+ {
+ pop_regs_range( (val & 0x03) + 4, context, ptrs );
+ if (val & 0x04)
+ pop_lr( 4, context, ptrs );
+ }
+ else if (*ptr <= 0xdf) /* pop {r4-rX,lr} */
+ {
+ pop_regs_range( (val & 0x03) + 8, context, ptrs );
+ if (val & 0x04)
+ pop_lr( 4, context, ptrs );
+ }
+ else if (*ptr <= 0xe7) /* vpop {d8-dX} */
+ pop_fpregs_range( 8, (val & 0x07) + 8, context, ptrs );
+ else if (*ptr <= 0xeb) /* add sp, sp, #x */
+ context->Sp += 4 * (val & 0x3ff);
+ else if (*ptr <= 0xed) /* pop {r0-r12,lr} */
+ {
+ pop_regs_mask( val & 0xff, context, ptrs );
+ if (val & 0x100)
+ pop_lr( 4, context, ptrs );
+ }
+ else if (*ptr <= 0xee) /* Microsoft-specific 0x00-0x0f, Available 0x10-0xff */
+ WARN( "unsupported code %02x\n", *ptr );
+ else if (*ptr <= 0xef && ((val & 0xff) <= 0x0f)) /* ldr lr, [sp], #x */
+ pop_lr( 4 * (val & 0x0f), context, ptrs );
+ else if (*ptr <= 0xf4) /* Available */
+ WARN( "unsupported code %02x\n", *ptr );
+ else if (*ptr <= 0xf5) /* vpop {dS-dE} */
+ pop_fpregs_range( (val & 0xf0) >> 4, (val & 0x0f), context, ptrs );
+ else if (*ptr <= 0xf6) /* vpop {dS-dE} */
+ pop_fpregs_range( ((val & 0xf0) >> 4) + 16, (val & 0x0f) + 16, context, ptrs );
+ else if (*ptr == 0xf7 || *ptr == 0xf9) /* add sp, sp, #x */
+ context->Sp += 4 * (val & 0xffff);
+ else if (*ptr == 0xf8 || *ptr == 0xfa) /* add sp, sp, #x */
+ context->Sp += 4 * (val & 0xffffff);
+ else if (*ptr <= 0xfc) /* nop */
+ /* nop */ ;
+ else /* end */
+ break;
+
+ ptr += len;
+ }
+}
+
+
+/***********************************************************************
+ * unwind_packed_data
+ */
+static void *unwind_packed_data( ULONG_PTR base, ULONG_PTR pc, RUNTIME_FUNCTION *func,
+ CONTEXT *context, KNONVOLATILE_CONTEXT_POINTERS *ptrs )
+{
+ int i, pos = 0;
+ int pf = 0, ef = 0, fpoffset = 0, stack = func->u.s.StackAdjust;
+ int prologue_regmask = 0;
+ int epilogue_regmask = 0;
+ unsigned int offset, len;
+ BYTE prologue[10], *prologue_end, epilogue[20], *epilogue_end;
+
+ TRACE( "function %lx-%lx: len=%#x flag=%x ret=%u H=%u reg=%u R=%u L=%u C=%u stackadjust=%x\n",
+ base + func->BeginAddress, base + func->BeginAddress + func->u.s.FunctionLength * 2,
+ func->u.s.FunctionLength, func->u.s.Flag, func->u.s.Ret,
+ func->u.s.H, func->u.s.Reg, func->u.s.R, func->u.s.L, func->u.s.C, func->u.s.StackAdjust );
+
+ offset = (pc - base) - func->BeginAddress;
+ if (func->u.s.StackAdjust >= 0x03f4)
+ {
+ pf = func->u.s.StackAdjust & 0x04;
+ ef = func->u.s.StackAdjust & 0x08;
+ stack = (func->u.s.StackAdjust & 3) + 1;
+ }
+
+ if (!func->u.s.R || pf)
+ {
+ int first = 4, last = func->u.s.Reg + 4;
+ if (pf)
+ {
+ first = (~func->u.s.StackAdjust) & 3;
+ if (func->u.s.R)
+ last = 3;
+ }
+ for (i = first; i <= last; i++)
+ prologue_regmask |= 1 << i;
+ fpoffset = last + 1 - first;
+ }
+
+ if (!func->u.s.R || ef)
+ {
+ int first = 4, last = func->u.s.Reg + 4;
+ if (ef)
+ {
+ first = (~func->u.s.StackAdjust) & 3;
+ if (func->u.s.R)
+ last = 3;
+ }
+ for (i = first; i <= last; i++)
+ epilogue_regmask |= 1 << i;
+ }
+
+ if (func->u.s.C)
+ {
+ prologue_regmask |= 1 << 11;
+ epilogue_regmask |= 1 << 11;
+ }
+
+ if (func->u.s.L)
+ {
+ prologue_regmask |= 1 << 14; /* lr */
+ if (func->u.s.Ret != 0)
+ epilogue_regmask |= 1 << 14; /* lr */
+ else if (!func->u.s.H)
+ epilogue_regmask |= 1 << 15; /* pc */
+ }
+
+ /* Synthesize prologue opcodes */
+ if (stack && !pf)
+ {
+ if (stack <= 0x7f)
+ {
+ prologue[pos++] = stack; /* sub sp, sp, #x */
+ }
+ else
+ {
+ prologue[pos++] = 0xe8 | (stack >> 8); /* sub.w sp, sp, #x */
+ prologue[pos++] = stack & 0xff;
+ }
+ }
+
+ if (func->u.s.R && func->u.s.Reg != 7)
+ prologue[pos++] = 0xe0 | func->u.s.Reg; /* vpush {d8-dX} */
+
+ if (func->u.s.C && fpoffset == 0)
+ prologue[pos++] = 0xfb; /* mov r11, sp - handled as nop16 */
+ else if (func->u.s.C)
+ prologue[pos++] = 0xfc; /* add r11, sp, #x - handled as nop32 */
+
+ if (prologue_regmask & 0xf00) /* r8-r11 set */
+ {
+ int bitmask = prologue_regmask & 0x1fff;
+ if (prologue_regmask & (1 << 14)) /* lr */
+ bitmask |= 0x2000;
+ prologue[pos++] = 0x80 | (bitmask >> 8); /* push.w {r0-r12,lr} */
+ prologue[pos++] = bitmask & 0xff;
+ }
+ else if (prologue_regmask) /* r0-r7, lr set */
+ {
+ int bitmask = prologue_regmask & 0xff;
+ if (prologue_regmask & (1 << 14)) /* lr */
+ bitmask |= 0x100;
+ prologue[pos++] = 0xec | (bitmask >> 8); /* push {r0-r7,lr} */
+ prologue[pos++] = bitmask & 0xff;
+ }
+
+ if (func->u.s.H)
+ prologue[pos++] = 0x04; /* push {r0-r3} - handled as sub sp, sp, #16 */
+
+ prologue[pos++] = 0xff; /* end */
+ prologue_end = &prologue[pos];
+
+ /* Synthesize epilogue opcodes */
+ pos = 0;
+ if (stack && !ef)
+ {
+ if (stack <= 0x7f)
+ {
+ epilogue[pos++] = stack; /* sub sp, sp, #x */
+ }
+ else
+ {
+ epilogue[pos++] = 0xe8 | (stack >> 8); /* sub.w sp, sp, #x */
+ epilogue[pos++] = stack & 0xff;
+ }
+ }
+
+ if (func->u.s.R && func->u.s.Reg != 7)
+ epilogue[pos++] = 0xe0 | func->u.s.Reg; /* vpush {d8-dX} */
+
+ if (epilogue_regmask & 0x7f00) /* r8-r11, lr set */
+ {
+ int bitmask = epilogue_regmask & 0x1fff;
+ if (epilogue_regmask & (3 << 14)) /* lr or pc */
+ bitmask |= 0x2000;
+ epilogue[pos++] = 0x80 | (bitmask >> 8); /* push.w {r0-r12,lr} */
+ epilogue[pos++] = bitmask & 0xff;
+ }
+ else if (epilogue_regmask) /* r0-r7, pc set */
+ {
+ int bitmask = epilogue_regmask & 0xff;
+ if (epilogue_regmask & (1 << 15)) /* pc */
+ bitmask |= 0x100; /* lr */
+ epilogue[pos++] = 0xec | (bitmask >> 8); /* push {r0-r7,lr} */
+ epilogue[pos++] = bitmask & 0xff;
+ }
+
+ if (func->u.s.H && !(func->u.s.L && func->u.s.Ret == 0))
+ epilogue[pos++] = 0x04; /* add sp, sp, #16 */
+ else if (func->u.s.H && (func->u.s.L && func->u.s.Ret == 0))
+ {
+ epilogue[pos++] = 0xef; /* ldr lr, [sp], #20 */
+ epilogue[pos++] = 5;
+ }
+
+ if (func->u.s.Ret == 1)
+ epilogue[pos++] = 0xfd; /* bx lr */
+ else if (func->u.s.Ret == 2)
+ epilogue[pos++] = 0xfe; /* b address */
+ else
+ epilogue[pos++] = 0xff; /* end */
+ epilogue_end = &epilogue[pos];
+
+ if (func->u.s.Flag == 1 && offset < 4 * (prologue_end - prologue)) {
+ /* Check prologue */
+ len = get_sequence_len( prologue, prologue_end, 0 );
+ if (offset < len)
+ {
+ process_unwind_codes( prologue, prologue_end, context, ptrs, len - offset );
+ return NULL;
+ }
+ }
+
+ if (func->u.s.Ret != 3 && 2 * func->u.s.FunctionLength - offset <= 4 * (epilogue_end - epilogue)) {
+ /* Check epilogue */
+ len = get_sequence_len( epilogue, epilogue_end, 1 );
+ if (offset >= 2 * func->u.s.FunctionLength - len)
+ {
+ process_unwind_codes( epilogue, epilogue_end, context, ptrs, offset - (2 * func->u.s.FunctionLength - len) );
+ return NULL;
+ }
+ }
+
+ /* Execute full prologue */
+ process_unwind_codes( prologue, prologue_end, context, ptrs, 0 );
+
+ return NULL;
+}
+
+
+/***********************************************************************
+ * unwind_full_data
+ */
+static void *unwind_full_data( ULONG_PTR base, ULONG_PTR pc, RUNTIME_FUNCTION *func,
+ CONTEXT *context, PVOID *handler_data, KNONVOLATILE_CONTEXT_POINTERS *ptrs )
+{
+ struct unwind_info *info;
+ struct unwind_info_epilog *info_epilog;
+ unsigned int i, codes, epilogs, len, offset;
+ void *data;
+ BYTE *end;
+
+ info = (struct unwind_info *)((char *)base + func->u.UnwindData);
+ data = info + 1;
+ epilogs = info->epilog;
+ codes = info->codes;
+ if (!codes && !epilogs)
+ {
+ struct unwind_info_ext *infoex = data;
+ codes = infoex->codes;
+ epilogs = infoex->epilog;
+ data = infoex + 1;
+ }
+ info_epilog = data;
+ if (!info->e) data = info_epilog + epilogs;
+
+ offset = (pc - base) - func->BeginAddress;
+ end = (BYTE *)data + codes * 4;
+
+ TRACE( "function %lx-%lx: len=%#x ver=%u X=%u E=%u F=%u epilogs=%u codes=%u\n",
+ base + func->BeginAddress, base + func->BeginAddress + info->function_length * 4,
+ info->function_length, info->version, info->x, info->e, info->f, epilogs, codes * 4 );
+
+ /* check for prolog */
+ if (offset < codes * 4 * 4 && !info->f)
+ {
+ len = get_sequence_len( data, end, 0 );
+ if (offset < len)
+ {
+ process_unwind_codes( data, end, context, ptrs, len - offset );
+ return NULL;
+ }
+ }
+
+ /* check for epilog */
+ if (!info->e)
+ {
+ for (i = 0; i < epilogs; i++)
+ {
+ /* TODO: Currently not checking epilogue conditions. */
+ if (offset < 2 * info_epilog[i].offset) break;
+ if (offset - 2 * info_epilog[i].offset < (codes * 4 - info_epilog[i].index) * 4)
+ {
+ BYTE *ptr = (BYTE *)data + info_epilog[i].index;
+ len = get_sequence_len( ptr, end, 1 );
+ if (offset <= 2 * info_epilog[i].offset + len)
+ {
+ process_unwind_codes( ptr, end, context, ptrs, offset - 2 * info_epilog[i].offset );
+ return NULL;
+ }
+ }
+ }
+ }
+ else if (2 * info->function_length - offset <= (codes * 4 - epilogs) * 4)
+ {
+ BYTE *ptr = (BYTE *)data + epilogs;
+ len = get_sequence_len( ptr, end, 1 );
+ if (offset >= 2 * info->function_length - len)
+ {
+ process_unwind_codes( ptr, end, context, ptrs, offset - (2 * info->function_length - len) );
+ return NULL;
+ }
+ }
+
+ process_unwind_codes( data, end, context, ptrs, 0 );
+
+ /* get handler since we are inside the main code */
+ if (info->x)
+ {
+ DWORD *handler_rva = (DWORD *)data + codes;
+ *handler_data = handler_rva + 1;
+ return (char *)base + *handler_rva;
+ }
+ return NULL;
+}
+
+/***********************************************************************
+ * RtlVirtualUnwind (NTDLL.@)
+ */
+PVOID WINAPI RtlVirtualUnwind( ULONG type, ULONG_PTR base, ULONG_PTR pc,
+ RUNTIME_FUNCTION *func, CONTEXT *context,
+ PVOID *handler_data, ULONG_PTR *frame_ret,
+ KNONVOLATILE_CONTEXT_POINTERS *ctx_ptr )
+{
+ void *handler;
+
+ TRACE( "type %x pc %lx sp %x func %lx\n", type, pc, context->Sp, base + func->BeginAddress );
+
+ *handler_data = NULL;
+
+ context->Pc = 0;
+ if (func->u.s.Flag)
+ handler = unwind_packed_data( base, pc, func, context, ctx_ptr );
+ else
+ handler = unwind_full_data( base, pc, func, context, handler_data, ctx_ptr );
+
+ TRACE( "ret: lr=%x sp=%x handler=%p\n", context->Lr, context->Sp, handler );
+ if (!context->Pc)
+ context->Pc = context->Lr;
+ context->ContextFlags |= CONTEXT_UNWOUND_TO_CALL;
+ *frame_ret = context->Sp;
+ return handler;
+}
+
+
/***********************************************************************
* RtlUnwind (NTDLL.@)
*/
--
2.25.1
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