5b6b084728
The MIPS frame save code was just saving a few registers, enough to do a backtrace if every function set up a frame. However, this is not working if you are using DWARF unwinding, because most of the registers are wrong. This was causing kdump backtraces to be short or bogus. So save all the registers. Signed-off-by: Corey Minyard <cminyard@mvista.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/16989/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
#ifndef _ASM_STACKTRACE_H
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#define _ASM_STACKTRACE_H
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#include <asm/ptrace.h>
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#include <asm/asm.h>
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#include <linux/stringify.h>
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#ifdef CONFIG_KALLSYMS
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extern int raw_show_trace;
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extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
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unsigned long pc, unsigned long *ra);
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extern unsigned long unwind_stack_by_address(unsigned long stack_page,
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unsigned long *sp,
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unsigned long pc,
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unsigned long *ra);
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#else
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#define raw_show_trace 1
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static inline unsigned long unwind_stack(struct task_struct *task,
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unsigned long *sp, unsigned long pc, unsigned long *ra)
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{
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return 0;
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}
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#endif
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#define STR_PTR_LA __stringify(PTR_LA)
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#define STR_LONG_S __stringify(LONG_S)
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#define STR_LONG_L __stringify(LONG_L)
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#define STR_LONGSIZE __stringify(LONGSIZE)
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#define STORE_ONE_REG(r) \
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STR_LONG_S " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t"
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static __always_inline void prepare_frametrace(struct pt_regs *regs)
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{
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#ifndef CONFIG_KALLSYMS
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/*
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* Remove any garbage that may be in regs (specially func
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* addresses) to avoid show_raw_backtrace() to report them
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*/
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memset(regs, 0, sizeof(*regs));
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#endif
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__asm__ __volatile__(
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".set push\n\t"
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".set noat\n\t"
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/* Store $1 so we can use it */
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STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t"
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/* Store the PC */
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"1: " STR_PTR_LA " $1, 1b\n\t"
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STR_LONG_S " $1,%0\n\t"
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STORE_ONE_REG(2)
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STORE_ONE_REG(3)
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STORE_ONE_REG(4)
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STORE_ONE_REG(5)
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STORE_ONE_REG(6)
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STORE_ONE_REG(7)
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STORE_ONE_REG(8)
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STORE_ONE_REG(9)
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STORE_ONE_REG(10)
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STORE_ONE_REG(11)
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STORE_ONE_REG(12)
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STORE_ONE_REG(13)
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STORE_ONE_REG(14)
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STORE_ONE_REG(15)
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STORE_ONE_REG(16)
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STORE_ONE_REG(17)
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STORE_ONE_REG(18)
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STORE_ONE_REG(19)
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STORE_ONE_REG(20)
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STORE_ONE_REG(21)
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STORE_ONE_REG(22)
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STORE_ONE_REG(23)
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STORE_ONE_REG(24)
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STORE_ONE_REG(25)
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STORE_ONE_REG(26)
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STORE_ONE_REG(27)
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STORE_ONE_REG(28)
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STORE_ONE_REG(29)
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STORE_ONE_REG(30)
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STORE_ONE_REG(31)
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/* Restore $1 */
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STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t"
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".set pop\n\t"
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: "=m" (regs->cp0_epc)
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: "r" (regs->regs)
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: "memory");
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}
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#endif /* _ASM_STACKTRACE_H */
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