0946b8c5c5
Currently, the inline asm is passed &newregs->ARM_r0 as in input, when modifying multiple fields of newregs. It's plausible to assume that GCC will assume newregs->ARM_r0 is modified when passed the address, but unfortunately this assumption is incorrect. Also, GCC has no way to guess that the other ARM_r* fields are modified without the addition of a "memory" clobber. Signed-off-by: Dave Martin <dave.martin@linaro.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
#ifndef _ARM_KEXEC_H
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#define _ARM_KEXEC_H
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#ifdef CONFIG_KEXEC
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control code buffer */
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#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
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#define KEXEC_CONTROL_PAGE_SIZE 4096
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#define KEXEC_ARCH KEXEC_ARCH_ARM
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#define KEXEC_ARM_ATAGS_OFFSET 0x1000
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#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000
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#ifndef __ASSEMBLY__
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/**
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* crash_setup_regs() - save registers for the panic kernel
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* @newregs: registers are saved here
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* @oldregs: registers to be saved (may be %NULL)
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*
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* Function copies machine registers from @oldregs to @newregs. If @oldregs is
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* %NULL then current registers are stored there.
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*/
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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if (oldregs) {
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memcpy(newregs, oldregs, sizeof(*newregs));
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} else {
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__asm__ __volatile__ ("stmia %0, {r0 - r15}"
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: : "r" (&newregs->ARM_r0) : "memory");
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__asm__ __volatile__ ("mrs %0, cpsr"
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: "=r" (newregs->ARM_cpsr));
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}
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}
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_KEXEC */
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#endif /* _ARM_KEXEC_H */
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