diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2022-11-27 13:49:36 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-12-02 07:54:08 +0100 |
| commit | 6f291a03819e4051ebc870471d26915ef2e6ba31 (patch) | |
| tree | 4d30df1db1b8290dbfe1216694dfaf34e9c4d1e5 /arch/powerpc/kernel/process.c | |
| parent | powerpc: add a define for the user interrupt frame size (diff) | |
| download | linux-6f291a03819e4051ebc870471d26915ef2e6ba31.tar.xz linux-6f291a03819e4051ebc870471d26915ef2e6ba31.zip | |
powerpc: add a define for the switch frame size and regs offset
This is open-coded in process.c, ppc32 uses a different define with the
same value, and the C definition is name differently which makes it an
extra indirection to grep for.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221127124942.1665522-12-npiggin@gmail.com
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 010a5ee746ae..0cb5296c6c41 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1808,10 +1808,10 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) * do some house keeping and then return from the fork or clone * system call, using the stack frame created above. */ - sp -= sizeof(struct pt_regs); - kregs = (struct pt_regs *) sp; - sp -= STACK_FRAME_OVERHEAD; + sp -= STACK_SWITCH_FRAME_SIZE; + kregs = (struct pt_regs *)(sp + STACK_SWITCH_FRAME_REGS); p->thread.ksp = sp; + #ifdef CONFIG_HAVE_HW_BREAKPOINT for (i = 0; i < nr_wp_slots(); i++) p->thread.ptrace_bps[i] = NULL; @@ -2261,8 +2261,12 @@ void __no_sanitize_address show_stack(struct task_struct *tsk, /* * See if this is an exception frame. * We look for the "regs" marker in the current frame. + * + * STACK_SWITCH_FRAME_SIZE being the smallest frame that + * could hold a pt_regs, if that does not fit then it can't + * have regs. */ - if (validate_sp(sp, tsk, STACK_FRAME_WITH_PT_REGS) + if (validate_sp(sp, tsk, STACK_SWITCH_FRAME_SIZE) && stack[STACK_INT_FRAME_MARKER_LONGS] == STACK_FRAME_REGS_MARKER) { struct pt_regs *regs = (struct pt_regs *) (sp + STACK_INT_FRAME_REGS); |