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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2018-11-27 17:38:16 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-12-19 18:56:32 +1100 |
| commit | 0ed5b55884f8b1fa368454d47cc6ecf9790b8b99 (patch) | |
| tree | 9b5055443140138498af413532a0be0cbb19ce57 /arch/powerpc | |
| parent | e93ba1b7eb5b188c749052df7af1c90821c5f320 (diff) | |
powerpc/8xx: add exception frame marker
This patch adds STACK_FRAME_REGS_MARKER in the stack at exception entry
in order to see interrupts in call traces as below:
[ 0.013964] Call Trace:
[ 0.014014] [c0745db0] [c007a9d4] tick_periodic.constprop.5+0xd8/0x104 (unreliable)
[ 0.014086] [c0745dc0] [c007aa20] tick_handle_periodic+0x20/0x9c
[ 0.014181] [c0745de0] [c0009cd0] timer_interrupt+0xa0/0x264
[ 0.014258] [c0745e10] [c000e484] ret_from_except+0x0/0x14
[ 0.014390] --- interrupt: 901 at console_unlock.part.7+0x3f4/0x528
[ 0.014390] LR = console_unlock.part.7+0x3f0/0x528
[ 0.014455] [c0745ee0] [c0050334] console_unlock.part.7+0x114/0x528 (unreliable)
[ 0.014542] [c0745f30] [c00524e0] register_console+0x3d8/0x44c
[ 0.014625] [c0745f60] [c0675aac] cpm_uart_console_init+0x18/0x2c
[ 0.014709] [c0745f70] [c06614f4] console_init+0x114/0x1cc
[ 0.014795] [c0745fb0] [c0658b68] start_kernel+0x300/0x3d8
[ 0.014864] [c0745ff0] [c00022cc] start_here+0x44/0x98
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index b171b7c0a0e7..57deb1e9ffea 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -166,6 +166,9 @@ instruction_counter: li r10,MSR_KERNEL & ~(MSR_IR|MSR_DR); /* can take exceptions */ \ mtmsr r10; \ stw r0,GPR0(r11); \ + lis r10, STACK_FRAME_REGS_MARKER@ha; /* exception frame marker */ \ + addi r10, r10, STACK_FRAME_REGS_MARKER@l; \ + stw r10, 8(r11); \ SAVE_4GPRS(3, r11); \ SAVE_2GPRS(7, r11) |