Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Sun, 11 Apr 2010 23:04:36 -0700 | From | David VomLehn <> | Subject | [PATCH 18/23] Make register values available to Score panic notifiers |
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The save_ptregs() function has not been tested or even built. I will need help to complete this.
Signed-off-by: David VomLehn <dvomlehn@cisco.com> --- arch/score/include/asm/ptrace.h | 136 +++++++++++++++++++++++++++++++++++++++ arch/score/kernel/traps.c | 2 +- 2 files changed, 137 insertions(+), 1 deletions(-)
diff --git a/arch/score/include/asm/ptrace.h b/arch/score/include/asm/ptrace.h index e89dc9b..d9a1293 100644 --- a/arch/score/include/asm/ptrace.h +++ b/arch/score/include/asm/ptrace.h @@ -91,6 +91,142 @@ extern int read_tsk_short(struct task_struct *, unsigned long, #define arch_has_single_step() (1) + +/* Macros for saving the contents of registers and for the output constraint + * for those registers */ +#include "/home/vomlehn/git/kernel.org/ptreg.h" +#define PTREG_SAVE(r, name) "sw " #r ", %[" #name "]\n" +#define PTREG_SAVE_R(i) PTREG_SAVE_I(r, r, i) + +#define PTREG_SAVE_R(regs, i) PTREG_SAVE_I(regs, r, r, i) + +#define arch_has_save_ptregs 1 + +/** + * save_ptregs - save processor registers for backtracing + * @regs: Pointer to &struct pt_regs structure in which to save the + * registers + * + * Returns a constant pointer to @regs. + * + * This function must be called first in a function. There must be no + * auto variables defined that are initialized before calling this function. + */ +static __always_inline +const struct pt_regs *save_ptregs(struct pt_regs *regs) +{ + __asm__ __volatile__ ( + PTREG_SAVE_R(0) + PTREG_SAVE_R(1) + PTREG_SAVE_R(2) + PTREG_SAVE_R(3) + PTREG_SAVE_R(4) + PTREG_SAVE_R(5) + PTREG_SAVE_R(6) + PTREG_SAVE_R(7) + PTREG_SAVE_R(8) + PTREG_SAVE_R(9) + PTREG_SAVE_R(10) + PTREG_SAVE_R(11) + PTREG_SAVE_R(12) + PTREG_SAVE_R(13) + PTREG_SAVE_R(14) + PTREG_SAVE_R(15) + PTREG_SAVE_R(16) + PTREG_SAVE_R(17) + PTREG_SAVE_R(18) + PTREG_SAVE_R(19) + PTREG_SAVE_R(20) + PTREG_SAVE_R(21) + PTREG_SAVE_R(22) + PTREG_SAVE_R(23) + PTREG_SAVE_R(24) + PTREG_SAVE_R(25) + PTREG_SAVE_R(26) + PTREG_SAVE_R(27) + PTREG_SAVE_R(28) + PTREG_SAVE_R(29) + PTREG_SAVE_R(30) + PTREG_SAVE_R(31) + + PTREG_SAVE(sr0, sr0) + PTREG_SAVE(sr1, sr1) + PTREG_SAVE(sr2, sr2) + + "mfcehl r30, r31\n" + PTREG_SAVE(r30, cp0_ceh) + PTREG_SAVE(r31, cp0_cel) + + "mfcr r31, cr0\n" + PTREG_SAVE(r31, cp0_ecr) + + "mfcr r31, cr1\n" + PTREG_SAVE(r31, cp0_condition) + + "mfcr r31, cr2\n" + PTREG_SAVE(r31, cp0_ecr) + + "mfcr r31, cr6\n" + PTREG_SAVE(r31, cp0_ema) + + /* + * The current location is the one for which the register + * values are correct, even if some had been modified on + * function entry. So, the current location is the value to + * save as the execution address. + */ + "1:\n" + "la r1, 1b" + PTREG_SAVE(r1, cp0_epc) + : + PTREG_OUT_R(regs, 0) + PTREG_OUT_R(regs, 1) + PTREG_OUT_R(regs, 2) + PTREG_OUT_R(regs, 3) + PTREG_OUT_R(regs, 4) + PTREG_OUT_R(regs, 5) + PTREG_OUT_R(regs, 6) + PTREG_OUT_R(regs, 7) + PTREG_OUT_R(regs, 8) + PTREG_OUT_R(regs, 9) + PTREG_OUT_R(regs, 10) + PTREG_OUT_R(regs, 11) + PTREG_OUT_R(regs, 12) + PTREG_OUT_R(regs, 13) + PTREG_OUT_R(regs, 14) + PTREG_OUT_R(regs, 15) + PTREG_OUT_R(regs, 16) + PTREG_OUT_R(regs, 17) + PTREG_OUT_R(regs, 18) + PTREG_OUT_R(regs, 19) + PTREG_OUT_R(regs, 20) + PTREG_OUT_R(regs, 21) + PTREG_OUT_R(regs, 22) + PTREG_OUT_R(regs, 23) + PTREG_OUT_R(regs, 24) + PTREG_OUT_R(regs, 25) + PTREG_OUT_R(regs, 26) + PTREG_OUT_R(regs, 27) + PTREG_OUT_R(regs, 28) + PTREG_OUT_R(regs, 29) + PTREG_OUT_R(regs, 30) + PTREG_OUT_R(regs, 31) + PTREG_OUT(regs, cel, cel) + PTREG_OUT(regs, ceh, ceh) + PTREG_OUT(regs, sr0, sr0) + PTREG_OUT(regs, sr1, sr1) + PTREG_OUT(regs, sr2, sr2) + PTREG_OUT(regs, cp0_epc, cp0_epc) + PTREG_OUT(regs, cp0_ema, cp0_ema) + PTREG_OUT(regs, cp0_psr, cp0_psr) + PTREG_OUT(regs, cp0_ecr, cp0_ecr) + PTREG_OUT(regs, cp0_condition, cp0_condition) + : + "r30", "r31" + ); + + return regs; +} #endif /* __KERNEL__ */ #endif /* _ASM_SCORE_PTRACE_H */ diff --git a/arch/score/kernel/traps.c b/arch/score/kernel/traps.c index 0e46fb1..1331829 100644 --- a/arch/score/kernel/traps.c +++ b/arch/score/kernel/traps.c @@ -283,7 +283,7 @@ asmlinkage void do_reserved(struct pt_regs *regs) */ die_if_kernel("do_reserved execution Exception", regs); show_regs(regs); - panic("Caught reserved exception - should not happen."); + panic_with_regs(regs, "Caught reserved exception - should not happen."); } /*
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