Bring in these functions from Linux v4.4. They will be needed for EFI loader
support.
Signed-off-by: Simon Glass <s...@chromium.org>
---
arch/x86/cpu/Makefile | 2 +-
arch/x86/cpu/setjmp.S | 71 +++++++++++++++++++++++++++++++++++++++++++
arch/x86/include/asm/setjmp.h | 24 +++++++++++++++
3 files changed, 96 insertions(+), 1 deletion(-)
create mode 100644 arch/x86/cpu/setjmp.S
create mode 100644 arch/x86/include/asm/setjmp.h
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile
index 2667e0b..f5b8c9e 100644
--- a/arch/x86/cpu/Makefile
+++ b/arch/x86/cpu/Makefile
@@ -10,7 +10,7 @@
extra-y = start.o
obj-$(CONFIG_X86_RESET_VECTOR) += resetvec.o start16.o
-obj-y += interrupts.o cpu.o cpu_x86.o call64.o
+obj-y += interrupts.o cpu.o cpu_x86.o call64.o setjmp.o
AFLAGS_REMOVE_call32.o := -mregparm=3 \
$(if $(CONFIG_EFI_STUB_64BIT),-march=i386 -m32)
diff --git a/arch/x86/cpu/setjmp.S b/arch/x86/cpu/setjmp.S
new file mode 100644
index 0000000..24e7d8a
--- /dev/null
+++ b/arch/x86/cpu/setjmp.S
@@ -0,0 +1,71 @@
+/*
+ * Written by H. Peter Anvin <h...@zytor.com>
+ * Brought in from Linux v4.4 and modified for U-Boot
+ * From Linux arch/um/sys-i386/setjmp.S
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <asm/global_data.h>
+#include <asm/msr-index.h>
+#include <asm/processor-flags.h>
+
+#define _REGPARM
+
+/*
+ * The jmp_buf is assumed to contain the following, in order:
+ * %ebx
+ * %esp
+ * %ebp
+ * %esi
+ * %edi
+ * <return address>
+ */
+
+ /*
+ * rdi - 32-bit code segment selector
+ * rsi - target address
+ * rdx - table address (0 if none)
+ */
+ .text
+ .align 4
+ .globl setjmp
+ .type setjmp, @function
+setjmp:
+#ifdef _REGPARM
+ movl %eax,%edx
+#else
+ movl 4(%esp),%edx
+#endif
+ popl %ecx # Return address, and adjust the stack
+ xorl %eax,%eax # Return value
+ movl %ebx,(%edx)
+ movl %esp,4(%edx) # Post-return %esp!
+ pushl %ecx # Make the call/return stack happy
+ movl %ebp,8(%edx)
+ movl %esi,12(%edx)
+ movl %edi,16(%edx)
+ movl %ecx,20(%edx) # Return address
+ ret
+
+ .size setjmp,.-setjmp
+
+ .text
+ .align 4
+ .globl longjmp
+ .type longjmp, @function
+longjmp:
+#ifdef _REGPARM
+ xchgl %eax,%edx
+#else
+ movl 4(%esp),%edx # jmp_ptr address
+ movl 8(%esp),%eax # Return value
+#endif
+ movl (%edx),%ebx
+ movl 4(%edx),%esp
+ movl 8(%edx),%ebp
+ movl 12(%edx),%esi
+ movl 16(%edx),%edi
+ jmp *20(%edx)
+
+ .size longjmp,.-longjmp
diff --git a/arch/x86/include/asm/setjmp.h b/arch/x86/include/asm/setjmp.h
new file mode 100644
index 0000000..deef67e
--- /dev/null
+++ b/arch/x86/include/asm/setjmp.h
@@ -0,0 +1,24 @@
+/*
+ * Written by H. Peter Anvin <h...@zytor.com>
+ * Brought in from Linux v4.4 and modified for U-Boot
+ * From Linux arch/um/sys-i386/setjmp.S
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef __setjmp_h
+#define __setjmp_h
+
+struct jmp_buf_data {
+ unsigned int __ebx;
+ unsigned int __esp;
+ unsigned int __ebp;
+ unsigned int __esi;
+ unsigned int __edi;
+ unsigned int __eip;
+};
+
+int setjmp(struct jmp_buf_data *jmp_buf);
+void longjmp(struct jmp_buf_data *jmp_buf);
+
+#endif
--
2.8.0.rc3.226.g39d4020
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