u-boot/arch/arm/include/asm/setjmp.h
Philipp Tomsich b4806d6f1f arm: provide a PCS-compliant setjmp implementation
The previous setjmp-implementation (as a static inline function that
contained an 'asm volatile' sequence) was extremely fragile: (some
versions of) GCC optimised the set of registers.  One critical example
was the removal of 'r9' from the clobber list, if -ffixed-reg9 was
supplied.

To increase robustness and ensure PCS-compliant behaviour, the setjmp
and longjmp implementation are now in assembly and closely match what
one would expect to find in a libc implementation.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Andy Yan <andy.yan@rock-chips.com>
2017-11-21 23:57:22 +01:00

28 lines
588 B
C

/*
* (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
* (C) Copyright 2016 Alexander Graf <agraf@suse.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _SETJMP_H_
#define _SETJMP_H_ 1
/*
* This really should be opaque, but the EFI implementation wrongly
* assumes that a 'struct jmp_buf_data' is defined.
*/
struct jmp_buf_data {
#if defined(__aarch64__)
u64 regs[13];
#else
u32 regs[10]; /* r4-r9, sl, fp, sp, lr */
#endif
};
typedef struct jmp_buf_data jmp_buf[1];
int setjmp(jmp_buf jmp);
void longjmp(jmp_buf jmp, int ret);
#endif /* _SETJMP_H_ */