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gdb/csky add unwinder for long branch cases

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There are two sequences of instructions for long branch:
1. jmpi [pc+4]    //insn code: 0xeac00001
   .long addr

2. lrw t1, [pc+8] //insn code: 0xea8d0002
   jmp t1         //insn code: 0x7834
   nop            //insn code: 0x6c03
   .long addr
This commit is contained in:
Jiangshuai Li 2022-09-13 14:19:26 +08:00
parent 02cd1b4e97
commit d354e0c8e7
2 changed files with 60 additions and 5 deletions
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60
gdb/csky-tdep.c
View File

@ -2358,21 +2358,71 @@ static const struct frame_unwind csky_unwind_cache = {
NULL
};
static CORE_ADDR
csky_check_long_branch (struct frame_info *frame, CORE_ADDR pc)
{
gdb_byte buf[8];
struct gdbarch *gdbarch = get_frame_arch (frame);
enum bfd_endian byte_order_for_code
= gdbarch_byte_order_for_code (gdbarch);
if (target_read_memory (pc, buf, 8) == 0)
{
unsigned int data0
= extract_unsigned_integer (buf, 4, byte_order_for_code);
unsigned int data1
= extract_unsigned_integer (buf + 4, 4, byte_order_for_code);
/* Case: jmpi [pc+4] : 0xeac00001
.long addr */
if (data0 == CSKY_JMPI_PC_4)
return data1;
/* Case: lrw t1, [pc+8] : 0xea8d0002
jmp t1 : 0x7834
nop : 0x6c03
.long addr */
if ((data0 == CSKY_LRW_T1_PC_8) && (data1 == CSKY_JMP_T1_VS_NOP))
{
if (target_read_memory (pc + 8, buf, 4) == 0)
return extract_unsigned_integer (buf, 4, byte_order_for_code);
}
return 0;
}
return 0;
}
static int
csky_stub_unwind_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
void **this_prologue_cache)
struct frame_info *this_frame,
void **this_prologue_cache)
{
CORE_ADDR addr_in_block;
CORE_ADDR addr_in_block, pc;
gdb_byte dummy[4];
const char *name;
CORE_ADDR start_addr;
/* Get pc */
addr_in_block = get_frame_address_in_block (this_frame);
pc = get_frame_pc (this_frame);
if (find_pc_partial_function (addr_in_block, NULL, NULL, NULL) == 0
|| in_plt_section (addr_in_block))
if (in_plt_section (addr_in_block)
|| target_read_memory (pc, dummy, 4) != 0)
return 1;
/* Find the starting address and name of the function containing the PC. */
if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0)
{
start_addr = csky_check_long_branch (this_frame, pc);
/* if not long branch, return 0. */
if (start_addr != 0)
return 1;
return 0;
}
return 0;
}

5
gdb/csky-tdep.h
View File

@ -385,4 +385,9 @@ enum csky_regnum
/* Macro for kernel 4.x */
#define CSKY_MOVI_R7_139 0x008bea07
/* Macro for check long branch. */
#define CSKY_JMPI_PC_4 0x1eac0
#define CSKY_LRW_T1_PC_8 0x2ea8d
#define CSKY_JMP_T1_VS_NOP 0x6c037834
#endif