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97d44b1f5c
To quit an EFI application we will need logic to jump to the caller of a function without returning from the function we called into, so we need setjmp/longjmp functionality. This patch introduces a trivial implementation of these that I verified works on armv7, thumb2 and aarch64. Signed-off-by: Alexander Graf <agraf@suse.de>
99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
/*
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* (C) Copyright 2016
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* Alexander Graf <agraf@suse.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _SETJMP_H_
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#define _SETJMP_H_ 1
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struct jmp_buf_data {
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ulong target;
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ulong regs[5];
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};
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typedef struct jmp_buf_data jmp_buf[1];
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static inline int setjmp(jmp_buf jmp)
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{
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long r = 0;
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#ifdef CONFIG_ARM64
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asm volatile(
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"adr x1, jmp_target\n"
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"str x1, %1\n"
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"stp x26, x27, %2\n"
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"stp x28, x29, %3\n"
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"mov x1, sp\n"
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"str x1, %4\n"
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"b 2f\n"
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"jmp_target: "
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"mov %0, #1\n"
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"2:\n"
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: "+r" (r), "=m" (jmp->target),
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"=m" (jmp->regs[0]), "=m" (jmp->regs[2]),
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"=m" (jmp->regs[4])
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:
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: "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
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"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
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"x16", "x17", "x18", "x19", "x20", "x21", "x22",
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"x23", "x24", "x25", /* x26, x27, x28, x29, sp */
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"x30", "cc", "memory");
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#else
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asm volatile(
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#ifdef CONFIG_SYS_THUMB_BUILD
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"adr r0, jmp_target + 1\n"
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#else
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"adr r0, jmp_target\n"
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#endif
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"mov r1, %1\n"
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"mov r2, sp\n"
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"stm r1, {r0, r2, r4, r5, r6, r7}\n"
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"b 2f\n"
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"jmp_target: "
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"mov %0, #1\n"
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"2:\n"
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: "+l" (r)
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: "l" (&jmp->target)
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: "r0", "r1", "r2", "r3", /* "r4", "r5", "r6", "r7", */
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"r8", "r9", "r10", "r11", /* sp, */ "ip", "lr",
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"cc", "memory");
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#endif
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printf("%s:%d target=%#lx\n", __func__, __LINE__, jmp->target);
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return r;
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}
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static inline __noreturn void longjmp(jmp_buf jmp)
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{
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#ifdef CONFIG_ARM64
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asm volatile(
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"ldr x0, %0\n"
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"ldr x1, %3\n"
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"mov sp, x1\n"
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"ldp x26, x27, %1\n"
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"ldp x28, x25, %2\n"
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"mov x29, x25\n"
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"br x0\n"
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:
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: "m" (jmp->target), "m" (jmp->regs[0]), "m" (jmp->regs[2]),
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"m" (jmp->regs[4])
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: "x0", "x1", "x25", "x26", "x27", "x28");
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#else
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asm volatile(
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"mov r1, %0\n"
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"ldm r1, {r0, r2, r4, r5, r6, r7}\n"
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"mov sp, r2\n"
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"bx r0\n"
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:
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: "l" (&jmp->target)
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: "r1");
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#endif
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while (1) { }
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}
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#endif /* _SETJMP_H_ */
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