From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
The header has been taken from glibc, the implementation itself is based
on the newlib implementation.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
arch/mips/Kconfig | 1 +
arch/mips/include/asm/setjmp.h | 32 ++++++++++++++++++++++
arch/mips/lib/Makefile | 1 +
arch/mips/lib/setjmp.S | 50 ++++++++++++++++++++++++++++++++++
4 files changed, 84 insertions(+)
create mode 100644 arch/mips/include/asm/setjmp.h
create mode 100644 arch/mips/lib/setjmp.S
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 48f97c4bbf30..7774abe94827 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -303,6 +303,7 @@ choice
config 32BIT
bool "32-bit barebox"
depends on CPU_SUPPORTS_32BIT_KERNEL && SYS_SUPPORTS_32BIT_KERNEL
+ select HAS_ARCH_SJLJ
help
Select this option if you want to build a 32-bit barebox.
diff --git a/arch/mips/include/asm/setjmp.h b/arch/mips/include/asm/setjmp.h
new file mode 100644
index 000000000000..5a9af7773a5f
--- /dev/null
+++ b/arch/mips/include/asm/setjmp.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+/*
+ * Define the machine-dependent type `jmp_buf'. MIPS version.
+ * Copyright (C) 1992-2021 Free Software Foundation, Inc.
+ * This file is part of the GNU C Library.
+ */
+
+#ifndef _MIPS_BITS_SETJMP_H
+#define _MIPS_BITS_SETJMP_H 1
+
+#include <asm/sgidefs.h>
+
+typedef struct __jmp_buf_internal_tag {
+ /* Program counter. */
+ void *__pc;
+
+ /* Stack pointer. */
+ void *__sp;
+
+ /* Callee-saved registers s0 through s7. */
+ int __regs[8];
+
+ /* The frame pointer. */
+ void *__fp;
+} jmp_buf[1];
+
+int setjmp(jmp_buf jmp) __attribute__((returns_twice));
+void longjmp(jmp_buf jmp, int ret) __attribute__((noreturn));
+int initjmp(jmp_buf jmp, void __noreturn (*func)(void), void *stack_top);
+
+#endif /* _MIPS_BITS_SETJMP_H */
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index 0761588ae865..88a2bdbd282b 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -8,6 +8,7 @@ obj-y += reloc.o
obj-y += sections.o
obj-y += shutdown.o
obj-y += dma-default.o
+obj-$(CONFIG_HAS_ARCH_SJLJ) += setjmp.o
obj-$(CONFIG_MIPS_OPTIMIZED_STRING_FUNCTIONS) += memcpy.o
obj-$(CONFIG_MIPS_OPTIMIZED_STRING_FUNCTIONS) += memset.o
diff --git a/arch/mips/lib/setjmp.S b/arch/mips/lib/setjmp.S
new file mode 100644
index 000000000000..b09a7c55293c
--- /dev/null
+++ b/arch/mips/lib/setjmp.S
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <asm/regdef.h>
+#include <asm/asm.h>
+#include <linux/linkage.h>
+
+/* int setjmp (jmp_buf); */
+LEAF(setjmp)
+ sw ra, (0 * 4)(a0)
+ sw sp, (1 * 4)(a0)
+ sw s0, (2 * 4)(a0)
+ sw s1, (3 * 4)(a0)
+ sw s2, (4 * 4)(a0)
+ sw s3, (5 * 4)(a0)
+ sw s4, (6 * 4)(a0)
+ sw s5, (7 * 4)(a0)
+ sw s6, (8 * 4)(a0)
+ sw s7, (9 * 4)(a0)
+ sw fp, (10 * 4)(a0)
+ move v0, zero
+ j ra
+END(setjmp)
+
+/* volatile void longjmp (jmp_buf, int); */
+LEAF(longjmp)
+ lw ra, (0 * 4)(a0)
+ lw sp, (1 * 4)(a0)
+ lw s0, (2 * 4)(a0)
+ lw s1, (3 * 4)(a0)
+ lw s2, (4 * 4)(a0)
+ lw s3, (5 * 4)(a0)
+ lw s4, (6 * 4)(a0)
+ lw s5, (7 * 4)(a0)
+ lw s6, (8 * 4)(a0)
+ lw s7, (9 * 4)(a0)
+ lw fp, (10 * 4)(a0)
+ bne a1, zero, 1f
+ li a1, 1
+1:
+ move v0, a1
+ j ra
+END(longjmp)
+
+/* int initjmp(jmp_buf jmp, void __noreturn (*func)(void), void *stack_top); */
+LEAF(initjmp)
+ sw a1, (0 * 4)(a0)
+ sw a2, (1 * 4)(a0)
+ move v0, zero
+ j ra
+END(initjmp)
--
2.29.2
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