From cd849ae9cd291117c0f7e0e8d531ab62a906e308 Mon Sep 17 00:00:00 2001 From: Dave Martin Date: Wed, 1 Dec 2010 18:05:14 +0100 Subject: [PATCH] ARM: 6518/1: kexec: Fix crash_setup_regs() for ARMv7 and CONFIG_THUMB2_KERNEL * Fix kexec build failure with CONFIG_THUMB2_KERNEL. * Avoids deprecated/forbidden sp and pc usage in for ARMv7 onwards, retaining compatibility with older architecture versions. * The pc value saved to newregs is now aligned on a predictable instruction boundary. (stmia { ... pc } or str pc has implementation-defined results in most versions of the ARM architecutre, and is prohibited (unpredictable) in Thumb-2.) * Switch to named inline asm arguments (else I get readily confused ...) The resulting code should be compatible with all architecture versions >= v3, with or without CONFIG_THUMB2_KERNEL. Reviewed-by: Will Deacon Tested-by: Mika Westerberg Signed-off-by: Dave Martin Acked-by: Catalin Marinas Signed-off-by: Russell King --- arch/arm/include/asm/kexec.h | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/arch/arm/include/asm/kexec.h b/arch/arm/include/asm/kexec.h index b37e02c91693..c0094d8edae4 100644 --- a/arch/arm/include/asm/kexec.h +++ b/arch/arm/include/asm/kexec.h @@ -33,10 +33,20 @@ static inline void crash_setup_regs(struct pt_regs *newregs, if (oldregs) { memcpy(newregs, oldregs, sizeof(*newregs)); } else { - __asm__ __volatile__ ("stmia %0, {r0 - r15}" - : : "r" (&newregs->ARM_r0) : "memory"); - __asm__ __volatile__ ("mrs %0, cpsr" - : "=r" (newregs->ARM_cpsr)); + __asm__ __volatile__ ( + "stmia %[regs_base], {r0-r12}\n\t" + "mov %[_ARM_sp], sp\n\t" + "str lr, %[_ARM_lr]\n\t" + "adr %[_ARM_pc], 1f\n\t" + "mrs %[_ARM_cpsr], cpsr\n\t" + "1:" + : [_ARM_pc] "=r" (newregs->ARM_pc), + [_ARM_cpsr] "=r" (newregs->ARM_cpsr), + [_ARM_sp] "=r" (newregs->ARM_sp), + [_ARM_lr] "=o" (newregs->ARM_lr) + : [regs_base] "r" (&newregs->ARM_r0) + : "memory" + ); } } -- 2.20.1