From 24b776bfb6396fded148167643ffaf8eb3f782b1 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Mon, 10 May 2010 09:22:14 +0100 Subject: [PATCH] ARM: 6117/1: kdump: implement crash_setup_regs() Implement machine specific function crash_setup_regs() which is responsible for storing machine state when crash occured. Signed-off-by: Mika Westerberg Signed-off-by: Russell King --- arch/arm/include/asm/kexec.h | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/arch/arm/include/asm/kexec.h b/arch/arm/include/asm/kexec.h index df15a0dc228e..8ec9ef5c3c7b 100644 --- a/arch/arm/include/asm/kexec.h +++ b/arch/arm/include/asm/kexec.h @@ -19,10 +19,26 @@ #ifndef __ASSEMBLY__ -struct kimage; -/* Provide a dummy definition to avoid build failures. */ +/** + * crash_setup_regs() - save registers for the panic kernel + * @newregs: registers are saved here + * @oldregs: registers to be saved (may be %NULL) + * + * Function copies machine registers from @oldregs to @newregs. If @oldregs is + * %NULL then current registers are stored there. + */ static inline void crash_setup_regs(struct pt_regs *newregs, - struct pt_regs *oldregs) { } + struct pt_regs *oldregs) +{ + if (oldregs) { + memcpy(newregs, oldregs, sizeof(*newregs)); + } else { + __asm__ __volatile__ ("stmia %0, {r0 - r15}" + : : "r" (&newregs->ARM_r0)); + __asm__ __volatile__ ("mrs %0, cpsr" + : "=r" (newregs->ARM_cpsr)); + } +} #endif /* __ASSEMBLY__ */ -- GitLab