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u-boot/arch/arm/include/asm/setjmp.h

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arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
/*
* (C) Copyright 2016
* Alexander Graf <agraf@suse.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _SETJMP_H_
#define _SETJMP_H_ 1
struct jmp_buf_data {
ulong target;
ulong regs[5];
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
int ret;
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
};
typedef struct jmp_buf_data jmp_buf[1];
static inline int setjmp(jmp_buf jmp)
{
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
jmp->ret = 0;
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
#ifdef CONFIG_ARM64
asm volatile(
"adr x1, jmp_target\n"
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
"str x1, %0\n"
"stp x26, x27, %1\n"
"stp x28, x29, %2\n"
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
"mov x1, sp\n"
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
"str x1, %3\n"
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
"jmp_target: "
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
: "=m" (jmp->target), "=m" (jmp->regs[0]),
"=m" (jmp->regs[2]), "=m" (jmp->regs[4])
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
:
: "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7",
"x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15",
"x16", "x17", "x18", "x19", "x20", "x21", "x22",
"x23", "x24", "x25", /* x26, x27, x28, x29, sp */
"x30", "cc", "memory");
#else
asm volatile(
#ifdef CONFIG_SYS_THUMB_BUILD
arm: Fix setjmp (again) Commit e677724 (arm: Fix setjmp) added code to fix compilation of the setjmp code path with thumv1. Unfortunately it missed a constraint that the adr instruction can only refer to 4 byte aligned offsets. So this patch adds the required alignment hooks to make compilation work again even when setjmp doesn't happen to be 4 byte aligned. Signed-off-by: Alexander Graf <agraf@suse.de> Tested-by: Tom Rini <trini@konsulko.com>
2016-07-05 18:37:17 +00:00
".align 2\n"
arm: Fix setjmp The setjmp/longjmp implementation did not work on thumb1 implementations because it used instruction encodings that don't exist on thumb1 yet. This patch limits itself to thumb1 instruction set for 32bit arm and removes a superfluous printf along the way. Signed-off-by: Alexander Graf <agraf@suse.de>
2016-06-13 12:01:07 +00:00
"adr r0, jmp_target\n"
"add r0, r0, $1\n"
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
#else
"adr r0, jmp_target\n"
#endif
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
"mov r1, %0\n"
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
"mov r2, sp\n"
arm: Fix setjmp The setjmp/longjmp implementation did not work on thumb1 implementations because it used instruction encodings that don't exist on thumb1 yet. This patch limits itself to thumb1 instruction set for 32bit arm and removes a superfluous printf along the way. Signed-off-by: Alexander Graf <agraf@suse.de>
2016-06-13 12:01:07 +00:00
"stm r1!, {r0, r2, r4, r5, r6, r7}\n"
arm: Fix setjmp (again) Commit e677724 (arm: Fix setjmp) added code to fix compilation of the setjmp code path with thumv1. Unfortunately it missed a constraint that the adr instruction can only refer to 4 byte aligned offsets. So this patch adds the required alignment hooks to make compilation work again even when setjmp doesn't happen to be 4 byte aligned. Signed-off-by: Alexander Graf <agraf@suse.de> Tested-by: Tom Rini <trini@konsulko.com>
2016-07-05 18:37:17 +00:00
".align 2\n"
"jmp_target: \n"
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
:
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
: "l" (&jmp->target)
: "r0", "r1", "r2", "r3", /* "r4", "r5", "r6", "r7", */
"r8", "r9", "r10", "r11", /* sp, */ "ip", "lr",
"cc", "memory");
#endif
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
return jmp->ret;
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
}
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
static inline __noreturn void longjmp(jmp_buf jmp, int ret)
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
{
arm: Add return value argument to longjmp The normal longjmp command allows for a caller to pass the return value of the setjmp() invocation. This patch adds that semantic to the arm implementation of it and adjusts the efi_loader call respectively. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org>
2016-09-27 07:30:32 +00:00
jmp->ret = ret;
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
#ifdef CONFIG_ARM64
asm volatile(
"ldr x0, %0\n"
"ldr x1, %3\n"
"mov sp, x1\n"
"ldp x26, x27, %1\n"
"ldp x28, x25, %2\n"
"mov x29, x25\n"
"br x0\n"
:
: "m" (jmp->target), "m" (jmp->regs[0]), "m" (jmp->regs[2]),
"m" (jmp->regs[4])
: "x0", "x1", "x25", "x26", "x27", "x28");
#else
asm volatile(
"mov r1, %0\n"
arm: Fix setjmp The setjmp/longjmp implementation did not work on thumb1 implementations because it used instruction encodings that don't exist on thumb1 yet. This patch limits itself to thumb1 instruction set for 32bit arm and removes a superfluous printf along the way. Signed-off-by: Alexander Graf <agraf@suse.de>
2016-06-13 12:01:07 +00:00
"ldm r1!, {r0, r2, r4, r5, r6, r7}\n"
arm: Introduce setjmp/longjmp 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>
2016-05-20 21:28:22 +00:00
"mov sp, r2\n"
"bx r0\n"
:
: "l" (&jmp->target)
: "r1");
#endif
while (1) { }
}
#endif /* _SETJMP_H_ */
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