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riscv: Add setjmp/longjmp code

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To support efi_loader we need to have platform support for setjmp/longjmp.
Add it here.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2018-04-23 07:59:43 +02:00 committed by Andes
parent c3c8638804
commit a7f99e5dd7
3 changed files with 93 additions and 0 deletions
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26
arch/riscv/include/asm/setjmp.h Normal file
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@ -0,0 +1,26 @@
/*
* (C) Copyright 2018 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 {
/* x2, x8, x9, x18, x19, x20, x21, x22, x23, x24, x25, x26, x27, sp */
unsigned long s_regs[12]; /* s0 - s11 */
unsigned long ra;
unsigned long sp;
};
typedef struct jmp_buf_data jmp_buf[1];
int setjmp(jmp_buf jmp);
void longjmp(jmp_buf jmp, int ret);
#endif /* _SETJMP_H_ */

1
arch/riscv/lib/Makefile
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@ -10,3 +10,4 @@ obj-$(CONFIG_CMD_BOOTM) += bootm.o
obj-$(CONFIG_CMD_GO) += boot.o
obj-y += cache.o
obj-y += interrupts.o
obj-y += setjmp.o

66
arch/riscv/lib/setjmp.S Normal file
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@ -0,0 +1,66 @@
/*
* (C) 2018 Alexander Graf <agraf@suse.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <linux/linkage.h>
#ifdef CONFIG_CPU_RISCV_64
#define STORE_IDX(reg, idx) sd reg, (idx*8)(a0)
#define LOAD_IDX(reg, idx) ld reg, (idx*8)(a0)
#else
#define STORE_IDX(reg, idx) sw reg, (idx*4)(a0)
#define LOAD_IDX(reg, idx) lw reg, (idx*4)(a0)
#endif
.pushsection .text.setjmp, "ax"
ENTRY(setjmp)
/* Preserve all callee-saved registers and the SP */
STORE_IDX(s0, 0)
STORE_IDX(s1, 1)
STORE_IDX(s2, 2)
STORE_IDX(s3, 3)
STORE_IDX(s4, 4)
STORE_IDX(s5, 5)
STORE_IDX(s6, 6)
STORE_IDX(s7, 7)
STORE_IDX(s8, 8)
STORE_IDX(s9, 9)
STORE_IDX(s10, 10)
STORE_IDX(s11, 11)
STORE_IDX(ra, 12)
STORE_IDX(sp, 13)
li a0, 0
ret
ENDPROC(setjmp)
.popsection
.pushsection .text.longjmp, "ax"
ENTRY(longjmp)
LOAD_IDX(s0, 0)
LOAD_IDX(s1, 1)
LOAD_IDX(s2, 2)
LOAD_IDX(s3, 3)
LOAD_IDX(s4, 4)
LOAD_IDX(s5, 5)
LOAD_IDX(s6, 6)
LOAD_IDX(s7, 7)
LOAD_IDX(s8, 8)
LOAD_IDX(s9, 9)
LOAD_IDX(s10, 10)
LOAD_IDX(s11, 11)
LOAD_IDX(ra, 12)
LOAD_IDX(sp, 13)
/* Move the return value in place, but return 1 if passed 0. */
beq a1, zero, longjmp_1
mv a0, a1
ret
longjmp_1:
li a0, 1
ret
ENDPROC(longjmp)
.popsection