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KGDB/KDB regression fixes

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3.4: Fix an an Smatch warning that appeared in the 3.4 merge window
    3.0: Fix kgdb test suite with SMP for all archs without HW single stepping
 2.6.36: Fix kgdb sw breakpoints with CONFIG_DEBUG_RODATA=y limitations on x86
 2.6.26: Fix oops on kgdb test suite with CONFIG_DEBUG_RODATA
         Fix kgdb test suite with SMP for all archs with HW single stepping
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Merge tag 'for_linus-3.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb

Pull KGDB/KDB regression fixes from Jason Wessel:
 - Fix a Smatch warning that appeared in the 3.4 merge window
 - Fix kgdb test suite with SMP for all archs without HW single stepping
 - Fix kgdb sw breakpoints with CONFIG_DEBUG_RODATA=y limitations on x86
 - Fix oops on kgdb test suite with CONFIG_DEBUG_RODATA
 - Fix kgdb test suite with SMP for all archs with HW single stepping

* tag 'for_linus-3.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb:
  x86,kgdb: Fix DEBUG_RODATA limitation using text_poke()
  kgdb,debug_core: pass the breakpoint struct instead of address and memory
  kgdbts: (2 of 2) fix single step awareness to work correctly with SMP
  kgdbts: (1 of 2) fix single step awareness to work correctly with SMP
  kgdbts: Fix kernel oops with CONFIG_DEBUG_RODATA
  kdb: Fix smatch warning on dbg_io_ops->is_console
This commit is contained in:
Linus Torvalds 2012-04-04 17:26:08 -07:00
commit 6c216ec636
5 changed files with 204 additions and 78 deletions
Download patch file Download diff file Expand all files Collapse all files

53
kernel/debug/debug_core.c
View file

@ -160,37 +160,39 @@ early_param("nokgdbroundup", opt_nokgdbroundup);
* Weak aliases for breakpoint management,
* can be overriden by architectures when needed:
*/
int __weak kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
int __weak kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
{
int err;
err = probe_kernel_read(saved_instr, (char *)addr, BREAK_INSTR_SIZE);
err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
return probe_kernel_write((char *)addr, arch_kgdb_ops.gdb_bpt_instr,
BREAK_INSTR_SIZE);
err = probe_kernel_write((char *)bpt->bpt_addr,
arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
return err;
}
int __weak kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
int __weak kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
{
return probe_kernel_write((char *)addr,
(char *)bundle, BREAK_INSTR_SIZE);
return probe_kernel_write((char *)bpt->bpt_addr,
(char *)bpt->saved_instr, BREAK_INSTR_SIZE);
}
int __weak kgdb_validate_break_address(unsigned long addr)
{
char tmp_variable[BREAK_INSTR_SIZE];
struct kgdb_bkpt tmp;
int err;
/* Validate setting the breakpoint and then removing it. In the
/* Validate setting the breakpoint and then removing it. If the
* remove fails, the kernel needs to emit a bad message because we
* are deep trouble not being able to put things back the way we
* found them.
*/
err = kgdb_arch_set_breakpoint(addr, tmp_variable);
tmp.bpt_addr = addr;
err = kgdb_arch_set_breakpoint(&tmp);
if (err)
return err;
err = kgdb_arch_remove_breakpoint(addr, tmp_variable);
err = kgdb_arch_remove_breakpoint(&tmp);
if (err)
printk(KERN_ERR "KGDB: Critical breakpoint error, kernel "
"memory destroyed at: %lx", addr);
@ -234,7 +236,6 @@ static void kgdb_flush_swbreak_addr(unsigned long addr)
*/
int dbg_activate_sw_breakpoints(void)
{
unsigned long addr;
int error;
int ret = 0;
int i;
@ -243,16 +244,15 @@ int dbg_activate_sw_breakpoints(void)
if (kgdb_break[i].state != BP_SET)
continue;
addr = kgdb_break[i].bpt_addr;
error = kgdb_arch_set_breakpoint(addr,
kgdb_break[i].saved_instr);
error = kgdb_arch_set_breakpoint(&kgdb_break[i]);
if (error) {
ret = error;
printk(KERN_INFO "KGDB: BP install failed: %lx", addr);
printk(KERN_INFO "KGDB: BP install failed: %lx",
kgdb_break[i].bpt_addr);
continue;
}
kgdb_flush_swbreak_addr(addr);
kgdb_flush_swbreak_addr(kgdb_break[i].bpt_addr);
kgdb_break[i].state = BP_ACTIVE;
}
return ret;
@ -301,7 +301,6 @@ int dbg_set_sw_break(unsigned long addr)
int dbg_deactivate_sw_breakpoints(void)
{
unsigned long addr;
int error;
int ret = 0;
int i;
@ -309,15 +308,14 @@ int dbg_deactivate_sw_breakpoints(void)
for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
if (kgdb_break[i].state != BP_ACTIVE)
continue;
addr = kgdb_break[i].bpt_addr;
error = kgdb_arch_remove_breakpoint(addr,
kgdb_break[i].saved_instr);
error = kgdb_arch_remove_breakpoint(&kgdb_break[i]);
if (error) {
printk(KERN_INFO "KGDB: BP remove failed: %lx\n", addr);
printk(KERN_INFO "KGDB: BP remove failed: %lx\n",
kgdb_break[i].bpt_addr);
ret = error;
}
kgdb_flush_swbreak_addr(addr);
kgdb_flush_swbreak_addr(kgdb_break[i].bpt_addr);
kgdb_break[i].state = BP_SET;
}
return ret;
@ -351,7 +349,6 @@ int kgdb_isremovedbreak(unsigned long addr)
int dbg_remove_all_break(void)
{
unsigned long addr;
int error;
int i;
@ -359,12 +356,10 @@ int dbg_remove_all_break(void)
for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
if (kgdb_break[i].state != BP_ACTIVE)
goto setundefined;
addr = kgdb_break[i].bpt_addr;
error = kgdb_arch_remove_breakpoint(addr,
kgdb_break[i].saved_instr);
error = kgdb_arch_remove_breakpoint(&kgdb_break[i]);
if (error)
printk(KERN_ERR "KGDB: breakpoint remove failed: %lx\n",
addr);
kgdb_break[i].bpt_addr);
setundefined:
kgdb_break[i].state = BP_UNDEFINED;
}