diff options
| author | Jordan Niethe <jniethe5@gmail.com> | 2022-11-09 15:51:04 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-11-30 21:46:48 +1100 |
| commit | 3671f4ebe3eb12e7222e4d7b0f94e85cfe34253a (patch) | |
| tree | 606d44fbe2e07bb1682594de855651d64f885295 /arch/powerpc/include | |
| parent | e082e99f6f87f5204b2531d5a3db7bbd929d23b1 (diff) | |
| download | linux-3671f4ebe3eb12e7222e4d7b0f94e85cfe34253a.tar.bz2 | |
powerpc: Allow clearing and restoring registers independent of saved breakpoint state
For the coming temporary mm used for instruction patching, the
breakpoint registers need to be cleared to prevent them from
accidentally being triggered. As soon as the patching is done, the
breakpoints will be restored.
The breakpoint state is stored in the per-cpu variable current_brk[].
Add a suspend_breakpoints() function which will clear the breakpoint
registers without touching the state in current_brk[]. Add a pair
function restore_breakpoints() which will move the state in
current_brk[] back to the registers.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221109045112.187069-2-bgray@linux.ibm.com
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/debug.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/debug.h b/arch/powerpc/include/asm/debug.h index 86a14736c76c..51c744608f37 100644 --- a/arch/powerpc/include/asm/debug.h +++ b/arch/powerpc/include/asm/debug.h @@ -46,6 +46,8 @@ static inline int debugger_fault_handler(struct pt_regs *regs) { return 0; } #endif void __set_breakpoint(int nr, struct arch_hw_breakpoint *brk); +void suspend_breakpoints(void); +void restore_breakpoints(void); bool ppc_breakpoint_available(void); #ifdef CONFIG_PPC_ADV_DEBUG_REGS extern void do_send_trap(struct pt_regs *regs, unsigned long address, |