Messages in this thread Patch in this message | | | Date | Sun, 11 Apr 2010 23:04:49 -0700 | From | David VomLehn <> | Subject | [PATCH 22/23] Make register values available to x86 panic notifiers |
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The save_ptregs() function compiles cleanly for 32-bit and 64-bit configurations, but has not been tested for either.
Signed-off-by: David VomLehn <dvomlehn@cisco.com> --- arch/x86/include/asm/ptrace.h | 115 +++++++++++++++++++++++++++++++++++++++++ arch/x86/kernel/traps.c | 6 +- 2 files changed, 118 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/ptrace.h b/arch/x86/include/asm/ptrace.h index 9d369f6..9e2d3d2 100644 --- a/arch/x86/include/asm/ptrace.h +++ b/arch/x86/include/asm/ptrace.h @@ -306,6 +306,121 @@ extern void ptrace_bts_untrace(struct task_struct *tsk); #define arch_ptrace_untrace(tsk) ptrace_bts_untrace(tsk) #endif /* CONFIG_X86_PTRACE_BTS */ +#include <linux/ptreg.h> +#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 + */ +#ifdef __i386__ +#define PTREG_SAVE(r) " mov %%" #r ", %[" #r "]\n" + +static __always_inline +const struct pt_regs *save_ptregs(register struct pt_regs *regs) +{ + __asm__ __volatile__ ( + PTREG_SAVE(bx) + PTREG_SAVE(cx) + PTREG_SAVE(dx) + PTREG_SAVE(si) + PTREG_SAVE(di) + PTREG_SAVE(bp) + PTREG_SAVE(ax) + PTREG_SAVE(ds) + PTREG_SAVE(es) + PTREG_SAVE(fs) + PTREG_SAVE(gs) + PTREG_SAVE(cs) + PTREG_SAVE(sp) + PTREG_SAVE(ss) + " pushfl\n" + " pop %[flags]\n" + "1:\n" + " movl $1b, %[ip]\n" + : + PTREG_OUT(regs, bx, bx), + PTREG_OUT(regs, cx, cx), + PTREG_OUT(regs, dx, dx), + PTREG_OUT(regs, si, si), + PTREG_OUT(regs, di, di), + PTREG_OUT(regs, bp, bp), + PTREG_OUT(regs, ax, ax), + PTREG_OUT(regs, ds, ds), + PTREG_OUT(regs, es, es), + PTREG_OUT(regs, fs, fs), + PTREG_OUT(regs, gs, gs), + PTREG_OUT(regs, ip, ip), + PTREG_OUT(regs, cs, cs), + PTREG_OUT(regs, flags, flags), + PTREG_OUT(regs, sp, sp), + PTREG_OUT(regs, ss, ss) + : + ); + return regs; +} +#else +#define PTREG_SAVE(r, name) " movq %%" #r ", %[" #name "]\n" +#define PTREG_SAVE_R(i) _PTREG_SAVE_I(r, r, i) + +#define PTREG_OUT_R(regs, i) _PTREG_OUT_I(regs, r, r, i) + +static __always_inline +const struct pt_regs *save_ptregs(struct pt_regs *regs) +{ + __asm__ __volatile__ ( + PTREG_SAVE_R(15) + PTREG_SAVE_R(14) + PTREG_SAVE_R(13) + PTREG_SAVE_R(12) + PTREG_SAVE(rbp, bp) + PTREG_SAVE(rbx, bx) + PTREG_SAVE_R(11) + PTREG_SAVE_R(10) + PTREG_SAVE_R(9) + PTREG_SAVE_R(8) + PTREG_SAVE(rax, ax) + PTREG_SAVE(rcx, cx) + PTREG_SAVE(rdx, dx) + PTREG_SAVE(rsi, si) + PTREG_SAVE(rdi, di) + "mov %%cs, %%ax\n" + PTREG_SAVE(rax, cs) + PTREG_SAVE(rsp, sp) + "mov %%ss, %%ax\n" + PTREG_SAVE(rax, ss) + " pushf\n" + " popq %[flags]\n" + "1:\n" + " movq $1b, %[ip]\n" + : + PTREG_OUT_R(regs, 15), + PTREG_OUT_R(regs, 14), + PTREG_OUT_R(regs, 13), + PTREG_OUT_R(regs, 12), + PTREG_OUT(regs, bp, bp), + PTREG_OUT(regs, bx, bx), + PTREG_OUT_R(regs, 11), + PTREG_OUT_R(regs, 10), + PTREG_OUT_R(regs, 9), + PTREG_OUT_R(regs, 8), + PTREG_OUT(regs, ax, ax), + PTREG_OUT(regs, cx, cx), + PTREG_OUT(regs, dx, dx), + PTREG_OUT(regs, si, si), + PTREG_OUT(regs, di, di), + PTREG_OUT(regs, ip, ip), + PTREG_OUT(regs, cs, cs), + PTREG_OUT(regs, flags, flags), + PTREG_OUT(regs, sp, sp), + PTREG_OUT(regs, ss, ss) + ); + return regs; +} +#endif /* __i386 */ #endif /* __KERNEL__ */ #endif /* !__ASSEMBLY__ */ diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 3339917..5b6af80 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -326,7 +326,7 @@ mem_parity_error(unsigned char reason, struct pt_regs *regs) #endif if (panic_on_unrecovered_nmi) - panic("NMI: Not continuing"); + panic_with_regs(regs, "NMI: Not continuing"); printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); @@ -344,7 +344,7 @@ io_check_error(unsigned char reason, struct pt_regs *regs) show_registers(regs); if (panic_on_io_nmi) - panic("NMI IOCK error: Not continuing"); + panic_with_regs(regs, "NMI IOCK error: Not continuing"); /* Re-enable the IOCK line, wait for a few seconds */ reason = (reason & 0xf) | 8; @@ -380,7 +380,7 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs) printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); if (panic_on_unrecovered_nmi) - panic("NMI: Not continuing"); + panic_with_regs(regs, "NMI: Not continuing"); printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); }
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