dbghelp/dwarf: Use the correct backend CPU in dwarf2_virtual_unwind().

dlls/dbghelp/dbghelp_private.h

@@ -443,6 +443,7 @@ struct cpu_stack_walk
     HANDLE                      hProcess;
     HANDLE                      hThread;
     BOOL                        is32;
+    struct cpu *                cpu;
     union
     {
         struct

dlls/dbghelp/dwarf.c

@@ -3008,10 +3008,11 @@ static void execute_cfa_instructions(dwarf2_traverse_context_t* ctx,
 }
 
 /* retrieve a context register from its dwarf number */
-static ULONG_PTR get_context_reg(union ctx *context, ULONG_PTR dw_reg)
+static ULONG_PTR get_context_reg(struct cpu_stack_walk *csw, union ctx *context,
+    ULONG_PTR dw_reg)
 {
-    unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg, TRUE), sz;
-    ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz);
+    unsigned regno = csw->cpu->map_dwarf_register(dw_reg, TRUE), sz;
+    ULONG_PTR* ptr = csw->cpu->fetch_context_reg(context, regno, &sz);
 
     if (sz != sizeof(ULONG_PTR))
     {
@@ -3025,8 +3026,8 @@ static ULONG_PTR get_context_reg(union ctx *context, ULONG_PTR dw_reg)
 static void set_context_reg(struct cpu_stack_walk* csw, union ctx *context,
     ULONG_PTR dw_reg, ULONG_PTR val, BOOL isdebuggee)
 {
-    unsigned regno = dbghelp_current_cpu->map_dwarf_register(dw_reg, TRUE), sz;
-    ULONG_PTR* ptr = dbghelp_current_cpu->fetch_context_reg(context, regno, &sz);
+    unsigned regno = csw->cpu->map_dwarf_register(dw_reg, TRUE), sz;
+    ULONG_PTR* ptr = csw->cpu->fetch_context_reg(context, regno, &sz);
 
     if (isdebuggee)
     {
@@ -3056,13 +3057,14 @@ static void set_context_reg(struct cpu_stack_walk* csw, union ctx *context,
 }
 
 /* copy a register from one context to another using dwarf number */
-static void copy_context_reg(union ctx *dstcontext, ULONG_PTR dwregdst,
-                             union ctx *srccontext, ULONG_PTR dwregsrc)
+static void copy_context_reg(struct cpu_stack_walk *csw,
+    union ctx *dstcontext, ULONG_PTR dwregdst,
+    union ctx *srccontext, ULONG_PTR dwregsrc)
 {
-    unsigned regdstno = dbghelp_current_cpu->map_dwarf_register(dwregdst, TRUE), szdst;
-    unsigned regsrcno = dbghelp_current_cpu->map_dwarf_register(dwregsrc, TRUE), szsrc;
-    ULONG_PTR* ptrdst = dbghelp_current_cpu->fetch_context_reg(dstcontext, regdstno, &szdst);
-    ULONG_PTR* ptrsrc = dbghelp_current_cpu->fetch_context_reg(srccontext, regsrcno, &szsrc);
+    unsigned regdstno = csw->cpu->map_dwarf_register(dwregdst, TRUE), szdst;
+    unsigned regsrcno = csw->cpu->map_dwarf_register(dwregsrc, TRUE), szsrc;
+    ULONG_PTR* ptrdst = csw->cpu->fetch_context_reg(dstcontext, regdstno, &szdst);
+    ULONG_PTR* ptrsrc = csw->cpu->fetch_context_reg(srccontext, regsrcno, &szsrc);
 
     if (szdst != szsrc)
     {
@@ -3094,9 +3096,10 @@ static ULONG_PTR eval_expression(const struct module* module, struct cpu_stack_w
         if (opcode >= DW_OP_lit0 && opcode <= DW_OP_lit31)
             stack[++sp] = opcode - DW_OP_lit0;
         else if (opcode >= DW_OP_reg0 && opcode <= DW_OP_reg31)
-            stack[++sp] = get_context_reg(context, opcode - DW_OP_reg0);
+            stack[++sp] = get_context_reg(csw, context, opcode - DW_OP_reg0);
         else if (opcode >= DW_OP_breg0 && opcode <= DW_OP_breg31)
-            stack[++sp] = get_context_reg(context, opcode - DW_OP_breg0) + dwarf2_leb128_as_signed(&ctx);
+            stack[++sp] = get_context_reg(csw, context, opcode - DW_OP_breg0)
+                          + dwarf2_leb128_as_signed(&ctx);
         else switch (opcode)
         {
         case DW_OP_nop:         break;
@@ -3153,12 +3156,12 @@ static ULONG_PTR eval_expression(const struct module* module, struct cpu_stack_w
             stack[++sp] = dwarf2_parse_augmentation_ptr(&ctx, tmp);
             break;
         case DW_OP_regx:
-            stack[++sp] = get_context_reg(context, dwarf2_leb128_as_unsigned(&ctx));
+            stack[++sp] = get_context_reg(csw, context, dwarf2_leb128_as_unsigned(&ctx));
             break;
         case DW_OP_bregx:
             reg = dwarf2_leb128_as_unsigned(&ctx);
             tmp = dwarf2_leb128_as_signed(&ctx);
-            stack[++sp] = get_context_reg(context, reg) + tmp;
+            stack[++sp] = get_context_reg(csw, context, reg) + tmp;
             break;
         case DW_OP_deref_size:
             sz = dwarf2_parse_byte(&ctx);
@@ -3205,7 +3208,7 @@ static void apply_frame_state(const struct module* module, struct cpu_stack_walk
         *cfa = eval_expression(module, csw, (const unsigned char*)state->cfa_offset, context);
         break;
     default:
-        *cfa = get_context_reg(context, state->cfa_reg) + state->cfa_offset;
+        *cfa = get_context_reg(csw, context, state->cfa_reg) + state->cfa_offset;
         break;
     }
     if (!*cfa) return;
@@ -3222,7 +3225,7 @@ static void apply_frame_state(const struct module* module, struct cpu_stack_walk
             set_context_reg(csw, &new_context, i, *cfa + state->regs[i], TRUE);
             break;
         case RULE_OTHER_REG:
-            copy_context_reg(&new_context, i, context, state->regs[i]);
+            copy_context_reg(csw, &new_context, i, context, state->regs[i]);
             break;
         case RULE_EXPRESSION:
             value = eval_expression(module, csw, (const unsigned char*)state->regs[i], context);
@@ -3282,7 +3285,7 @@ BOOL dwarf2_virtual_unwind(struct cpu_stack_walk *csw, ULONG_PTR ip,
 
     TRACE("function %lx/%lx code_align %lu data_align %ld retaddr %s\n",
           ip, info.ip, info.code_align, info.data_align,
-          dbghelp_current_cpu->fetch_regname(dbghelp_current_cpu->map_dwarf_register(info.retaddr_reg, TRUE)));
+          csw->cpu->fetch_regname(csw->cpu->map_dwarf_register(info.retaddr_reg, TRUE)));
 
     /* if at very beginning of function, return and use default unwinder */
     if (ip == info.ip) return FALSE;

dlls/dbghelp/stack.c

@@ -175,6 +175,7 @@ BOOL WINAPI StackWalk(DWORD MachineType, HANDLE hProcess, HANDLE hThread,
     csw.hProcess = hProcess;
     csw.hThread = hThread;
     csw.is32 = TRUE;
+    csw.cpu = cpu;
     /* sigh... MS isn't even consistent in the func prototypes */
     csw.u.s32.f_read_mem = (f_read_mem) ? f_read_mem : read_mem;
     csw.u.s32.f_xlat_adr = f_xlat_adr;
@@ -231,6 +232,7 @@ BOOL WINAPI StackWalk64(DWORD MachineType, HANDLE hProcess, HANDLE hThread,
     csw.hProcess = hProcess;
     csw.hThread = hThread;
     csw.is32 = FALSE;
+    csw.cpu = cpu;
     /* sigh... MS isn't even consistent in the func prototypes */
     csw.u.s64.f_read_mem = (f_read_mem) ? f_read_mem : read_mem64;
     csw.u.s64.f_xlat_adr = (f_xlat_adr) ? f_xlat_adr : addr_to_linear;