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another one fix to dw_op_breg_x. try to calc DW_OP_GNU_entry_value in

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caller frame
This commit is contained in:
nnosov
2020-01-16 17:48:06 +04:00
parent 524c4fa52d
commit 6d6f0d2d45
1 changed files with 19 additions and 3 deletions
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framework/dwarf_operations.cpp
+19 -3
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@@ -792,7 +792,7 @@ bool dw_op_breg_x(dwarf_stack* stack, const dwarf_op_map* map, Dwarf_Word op1, D
}
val += off;
stack->push(&val, sizeof(val), DWARF_TYPE_REGISTER_LOC | DWARF_TYPE_GENERIC);
stack->push(&val, sizeof(val), DWARF_TYPE_GENERIC);
return true;
}
@@ -1107,7 +1107,7 @@ bool __dwarf_stack::calc_expression(Dwarf_Op *exprs, int expr_len, Dwarf_Attribu
v->replace(&value, sizeof(value), DWARF_TYPE_GENERIC);
}
// handle there because it contains sub-expression of a Location in callers frame
// handle there because it contains sub-expression of a Location in caller's frame
if(map->op_num == DW_OP_GNU_entry_value) {
// This opcode has two operands, the first one is uleb128 length and the second is block of that length, containing either a
// simple register or DWARF expression
@@ -1116,16 +1116,32 @@ bool __dwarf_stack::calc_expression(Dwarf_Op *exprs, int expr_len, Dwarf_Attribu
Dwarf_Op *expr;
size_t exprlen;
if (dwarf_getlocation(&attr_mem, &expr, &exprlen) == 0) {
if(!calc_expression(expr, exprlen, &attr_mem)) {
// save current frame cursor
unw_cursor_t cursor = ctx->curr_frame; ctx->curr_frame = ctx->next_frame;
dwarf_stack st(ctx);
bool eret = st.calc_expression(expr, exprlen, &attr_mem);
uint64_t val;
bool gret = false;
if(eret) {
gret = st.get_value(val);
}
// restore current frame cursor
ctx->curr_frame = cursor;
if(!eret || !gret) {
ctx->log(SEVERITY_ERROR, "Failed to calculate sub-expression for operation %s(0x%lX, 0x%lX)", map->op_name, exprs[i].number, exprs[i].number2);
return false;
}
ctx->log(SEVERITY_DEBUG, "DW_OP_GNU_entry_value calculated from caller frame = 0x%lX", val);
push(&val, sizeof(val), DWARF_TYPE_GENERIC);
continue;
} else {
ctx->log(SEVERITY_ERROR, "Failed to get DW_OP_GNU_entry_value attr location");
return false;
}
} else {
ctx->log(SEVERITY_ERROR, "Failed to get DW_OP_GNU_entry_value attr expression");
return false;
}
}