mirror/pstrace
4
0
Fork 0
Code Activity

add suppoert of dw_op_fbreg & dw_op_call_frame_cfa DWARF operations and

Browse Source 
use them
This commit is contained in:
nnosov
2020-01-13 18:37:56 +04:00
parent 50bebda6a1
commit a1954685e5
2 changed files with 43 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
framework/dwarf_operations.cpp
+42 -5
View File
@@ -159,7 +159,7 @@ bool dw_op_constu(pst_context* ctx, const dwarf_op_map* map, Dwarf_Word op1, Dwa
bool dw_op_consts(pst_context* ctx, const dwarf_op_map* map, Dwarf_Word op1, Dwarf_Word op2)
{
// The single operand of the DW_OP_consts operation provides a signed LEB128 integer constant.
uint64_t value = decode_sleb128((unsigned char*)&op1);
int64_t value = decode_sleb128((unsigned char*)&op1);
ctx->stack.push(&value, sizeof(value), DWARF_TYPE_LONG | DWARF_TYPE_SIGNED | DWARF_TYPE_CONST | DWARF_TYPE_GENERIC);
return true;
}
@@ -807,6 +807,45 @@ bool dw_op_stack_value(pst_context* ctx, const dwarf_op_map* map, Dwarf_Word op1
return false;
}
bool dw_op_call_frame_cfa(pst_context* ctx, const dwarf_op_map* map, Dwarf_Word op1, Dwarf_Word op2)
{
// DWARF5, Section 2.6.1.1.4:
// The DW_OP_stack_value operation specifies that the object does not exist in memory but its value is nonetheless known and is at the top of the DWARF
// expression stack. In this form of location description, the DWARF expression represents the actual value of the object, rather than its location.
// The DW_OP_stack_value operation terminates the expression.
// since in signal handler we are know SP value, just push it to DWARF stack
unw_word_t sp;
if(unw_get_reg(&ctx->cursor, UNW_REG_SP, &sp)) {
return false;
}
ctx->stack.push(&sp, sizeof(sp), DWARF_TYPE_MEMORY_LOC | DWARF_TYPE_GENERIC);
return true;
}
bool dw_op_fbreg(pst_context* ctx, const dwarf_op_map* map, Dwarf_Word op1, Dwarf_Word op2)
{
// The DW_OP_fbreg operation provides a signed LEB128 offset from the address specified by the location description in the DW_AT_frame_base
// attribute of the current function. This is typically a stack pointer register plus or minus some offset
// since in signal handler we are know SP value, just use it as DW_AT_frame_base
unw_word_t sp;
if(unw_get_reg(&ctx->cursor, UNW_REG_SP, &sp)) {
return false;
}
int64_t off = decode_sleb128((unsigned char*)&op1);
sp += off;
ctx->stack.push(&sp, sizeof(sp), DWARF_TYPE_MEMORY_LOC | DWARF_TYPE_GENERIC);
return true;
}
dwarf_op_map dw_op[] = {
{DW_OP_addr, "DW_OP_addr", dw_op_addr},
{DW_OP_deref, "DW_OP_deref", dw_op_deref},
@@ -961,11 +1000,9 @@ dwarf_op_map dw_op[] = {
{DW_OP_breg31, "DW_OP_breg31", dw_op_breg_x},
{DW_OP_regx, "DW_OP_regx", dw_op_reg_x},
// The DW_OP_fbreg operation provides a signed LEB128 offset from the address specified by the location description in the DW_AT_frame_base
// attribute of the current function. This is typically a stack pointer register plus or minus some offset
{DW_OP_fbreg, "DW_OP_fbreg", dw_op_notimpl},
{DW_OP_fbreg, "DW_OP_fbreg", dw_op_fbreg},
{DW_OP_bregx, "DW_OP_bregx", dw_op_breg_x},
{DW_OP_call_frame_cfa, "DW_OP_call_frame_cfa", dw_op_notimpl},
{DW_OP_call_frame_cfa, "DW_OP_call_frame_cfa", dw_op_call_frame_cfa},
{DW_OP_stack_value, "DW_OP_stack_value", dw_op_stack_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