automake commit without merge history

grub-core/lib/x86_64/setjmp.S

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+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2003,2007  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"setjmp.S"
+
+	.text
+
+/*
+ *  jmp_buf:
+ *   rbx rsp rbp r12 r13 r14 r15 rip
+ *   0   8   16  24  32  40  48  56
+ */
+
+/*
+ * int grub_setjmp (grub_jmp_buf env)
+ */
+FUNCTION(grub_setjmp)
+	pop	%rsi		/* Return address, and adjust the stack */
+	xorq	%rax, %rax
+	movq	%rbx, 0(%rdi)	/* RBX */
+	movq	%rsp, 8(%rdi)   /* RSP */
+	push	%rsi
+	movq	%rbp, 16(%rdi)	/* RBP */
+	movq	%r12, 24(%rdi)	/* R12 */
+	movq	%r13, 32(%rdi)	/* R13 */
+	movq	%r14, 40(%rdi)	/* R14 */
+	movq	%r15, 48(%rdi)	/* R15 */
+	movq	%rsi, 56(%rdi)	/* RSI */
+	ret
+
+/*
+ * int grub_longjmp (grub_jmp_buf env, int val)
+ */
+FUNCTION(grub_longjmp)
+	movl	%esi, %eax
+	orl	%eax, %eax
+	jnz	1f
+	incl	%eax
+1:
+
+	movq	(%rdi), %rbx
+	movq	8(%rdi), %rsp
+	movq	16(%rdi), %rbp
+	movq	24(%rdi), %r12
+	movq    32(%rdi), %r13
+	movq    40(%rdi), %r14
+	movq    48(%rdi), %r15
+	jmp	*56(%rdi)