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| author | Alexander Graf <agraf@suse.de> | 2018-04-23 07:59:43 +0200 |
|---|---|---|
| committer | Andes <uboot@andestech.com> | 2018-05-29 14:43:12 +0800 |
| commit | a7f99e5dd7dfa1853dee25e0fcb761eee0fb3ad3 (patch) | |
| tree | 4a22ea380b55b8b74e0ca03d6c96dc472bdf07f1 /arch/riscv/lib/setjmp.S | |
| parent | c3c863880479edeb5b08226e622d13c91326e4a7 (diff) | |
| download | u-boot-a7f99e5dd7dfa1853dee25e0fcb761eee0fb3ad3.zip u-boot-a7f99e5dd7dfa1853dee25e0fcb761eee0fb3ad3.tar.gz u-boot-a7f99e5dd7dfa1853dee25e0fcb761eee0fb3ad3.tar.bz2 | |
riscv: Add setjmp/longjmp code
To support efi_loader we need to have platform support for setjmp/longjmp.
Add it here.
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/riscv/lib/setjmp.S')
| -rw-r--r-- | arch/riscv/lib/setjmp.S | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/riscv/lib/setjmp.S b/arch/riscv/lib/setjmp.S new file mode 100644 index 0000000..103f359 --- /dev/null +++ b/arch/riscv/lib/setjmp.S @@ -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 |