static int check_and_rewind_pc(char *put_str, char *arg)
{
unsigned long addr = lookup_addr(arg);
unsigned long ip;
int offset = 0;
kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
NUMREGBYTES);
gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
ip = instruction_pointer(&kgdbts_regs);
v2printk("Stopped at IP: %lx\n", ip);
#ifdef GDB_ADJUSTS_BREAK_OFFSET
/* On some arches, a breakpoint stop requires it to be decremented */
if (addr + BREAK_INSTR_SIZE == ip)
offset = -BREAK_INSTR_SIZE;
#endif
if (strcmp(arg, "silent") && ip + offset != addr) {
eprintk("kgdbts: BP mismatch %lx expected %lx\n",
ip + offset, addr);
return 1;
}
/* Readjust the instruction pointer if needed */
ip += offset;
#ifdef GDB_ADJUSTS_BREAK_OFFSET
instruction_pointer_set(&kgdbts_regs, ip);
#endif
return 0;
}
static int check_and_rewind_pc(char *put_str, char *arg)
{
unsigned long addr = lookup_addr(arg);
int offset = 0;
kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
NUMREGBYTES);
gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
v2printk("Stopped at IP: %lx\n", instruction_pointer(&kgdbts_regs));
#ifdef CONFIG_X86
/* On x86 a breakpoint stop requires it to be decremented */
if (addr + 1 == kgdbts_regs.ip)
offset = -1;
#endif
if (strcmp(arg, "silent") &&
instruction_pointer(&kgdbts_regs) + offset != addr) {
eprintk("kgdbts: BP mismatch %lx expected %lx\n",
instruction_pointer(&kgdbts_regs) + offset, addr);
return 1;
}
#ifdef CONFIG_X86
/* On x86 adjust the instruction pointer if needed */
kgdbts_regs.ip += offset;
#endif
return 0;
}
static int emul_sstep_put(char *put_str, char *arg)
{
if (!arch_needs_sstep_emulation) {
char *ptr = &put_str[11];
if (put_str[1] != 'T' || put_str[2] != '0')
return 1;
kgdb_hex2long(&ptr, &sstep_thread_id);
return 0;
}
switch (sstep_state) {
case 1:
/* validate the "g" packet to get the IP */
kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
NUMREGBYTES);
gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
v2printk("Stopped at IP: %lx\n",
instruction_pointer(&kgdbts_regs));
/* Want to stop at IP + break instruction size by default */
sstep_addr = cont_addr + BREAK_INSTR_SIZE;
break;
case 2:
if (strncmp(put_str, "$OK", 3)) {
eprintk("kgdbts: failed sstep break set\n");
return 1;
}
break;
case 3:
if (strncmp(put_str, "$T0", 3)) {
eprintk("kgdbts: failed continue sstep\n");
return 1;
} else {
char *ptr = &put_str[11];
kgdb_hex2long(&ptr, &sstep_thread_id);
}
break;
case 4:
if (strncmp(put_str, "$OK", 3)) {
eprintk("kgdbts: failed sstep break unset\n");
return 1;
}
/* Single step is complete so continue on! */
sstep_state = 0;
return 0;
default:
eprintk("kgdbts: ERROR failed sstep put emulation\n");
}
/* Continue on the same test line until emulation is complete */
ts.idx--;
return 0;
}
static int check_single_step(char *put_str, char *arg)
{
unsigned long addr = lookup_addr(arg);
static int matched_id;
/*
* From an arch indepent point of view the instruction pointer
* should be on a different instruction
*/
kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
NUMREGBYTES);
gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
v2printk("Singlestep stopped at IP: %lx\n",
instruction_pointer(&kgdbts_regs));
if (sstep_thread_id != cont_thread_id) {
/*
* Ensure we stopped in the same thread id as before, else the
* debugger should continue until the original thread that was
* single stepped is scheduled again, emulating gdb's behavior.
*/
v2printk("ThrID does not match: %lx\n", cont_thread_id);
if (arch_needs_sstep_emulation) {
if (matched_id &&
instruction_pointer(&kgdbts_regs) != addr)
goto continue_test;
matched_id++;
ts.idx -= 2;
sstep_state = 0;
return 0;
}
cont_instead_of_sstep = 1;
ts.idx -= 4;
return 0;
}
continue_test:
matched_id = 0;
if (instruction_pointer(&kgdbts_regs) == addr) {
eprintk("kgdbts: SingleStep failed at %lx\n",
instruction_pointer(&kgdbts_regs));
return 1;
}
return 0;
}
static int check_single_step(char *put_str, char *arg)
{
unsigned long addr = lookup_addr(arg);
/*
* From an arch indepent point of view the instruction pointer
* should be on a different instruction
*/
kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
NUMREGBYTES);
gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
v2printk("Singlestep stopped at IP: %lx\n",
instruction_pointer(&kgdbts_regs));
if (instruction_pointer(&kgdbts_regs) == addr) {
eprintk("kgdbts: SingleStep failed at %lx\n",
instruction_pointer(&kgdbts_regs));
return 1;
}
return 0;
}
static int check_and_rewind_pc(char *put_str, char *arg)
{
unsigned long addr = lookup_addr(arg);
unsigned long ip;
int offset = 0;
kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
NUMREGBYTES);
gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
ip = instruction_pointer(&kgdbts_regs);
v2printk("Stopped at IP: %lx\n", ip);
#ifdef GDB_ADJUSTS_BREAK_OFFSET
/* On some arches, a breakpoint stop requires it to be decremented */
if (addr + BREAK_INSTR_SIZE == ip)
offset = -BREAK_INSTR_SIZE;
#endif
if (arch_needs_sstep_emulation && sstep_addr &&
ip + offset == sstep_addr &&
((!strcmp(arg, "sys_open") || !strcmp(arg, "do_fork")))) {
/* This is special case for emulated single step */
v2printk("Emul: rewind hit single step bp\n");
restart_from_top_after_write = 1;
} else if (strcmp(arg, "silent") && ip + offset != addr) {
eprintk("kgdbts: BP mismatch %lx expected %lx\n",
ip + offset, addr);
return 1;
}
/* Readjust the instruction pointer if needed */
ip += offset;
cont_addr = ip;
#ifdef GDB_ADJUSTS_BREAK_OFFSET
instruction_pointer_set(&kgdbts_regs, ip);
#endif
return 0;
}