nuttx/libs/libc/machine/sim/arch_setjmp_x86_64.S

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/**************************************************************************
* libs/libc/machine/sim/arch_setjmp_x86_64.S
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
**************************************************************************/
/**************************************************************************
* Included Files
**************************************************************************/
#include <arch/setjmp.h>
/**************************************************************************
* Pre-processor Definitions
**************************************************************************/
2014-04-14 00:22:22 +02:00
/* The Microsoft x64 calling convention is followed on Microsoft Windows and
* pre-boot UEFI (for long mode on x86-64). It uses registers RCX, RDX, R8,
* R9 for the first four integer or pointer arguments (in that order), and
* XMM0, XMM1, XMM2, XMM3 are used for floating point arguments. Additional
* arguments are pushed onto the stack (right to left). Integer return
* values (similar to x86) are returned in RAX if 64 bits or less. Floating
* point return values are returned in XMM0. Parameters less than 64 bits
* long are not zero extended; the high bits are not zeroed.
*/
#ifdef CONFIG_SIM_X8664_MICROSOFT
# define REGS %rcx
/* The calling convention of the System V AMD64 ABI is followed on Solaris,
* Linux, FreeBSD, macOS, and other UNIX-like or POSIX-compliant operating
* systems. The first six integer or pointer arguments are passed in registers
* RDI, RSI, RDX, RCX, R8, and R9, while XMM0, XMM1, XMM2, XMM3, XMM4, XMM5,
* XMM6 and XMM7 are used for floating point arguments. For system calls, R10
* is used instead of RCX. As in the Microsoft x64 calling convention,
* additional arguments are passed on the stack and the return value is stored
* in RAX.
*
* Registers RBP, RBX, and R12-R15 are callee-save registers; all others must
* be saved by the caller if they wish to preserve their values.
*
* Unlike the Microsoft calling convention, a shadow space is not provided; on
* function entry, the return address is adjacent to the seventh integer
* argument on the stack.
*/
#else /* if defined(CONFIG_SIM_X8664_SYSTEMV) */
# define REGS %rdi
#endif
#ifdef __CYGWIN__
# define SYMBOL(s) s
#elif defined(__ELF__)
# define SYMBOL(s) s
#else
# define SYMBOL(s) _##s
#endif
/**************************************************************************
* Public Functions
**************************************************************************/
.text
.align 4
.globl SYMBOL(setjmp)
#ifdef __ELF__
.type SYMBOL(setjmp), @function
#endif
SYMBOL(setjmp):
/* Get the return address, adjusting the stack pointer */
pop %rsi
/* Set up the return value */
xorl %eax,%eax
/* Save 1: rbx */
movq %rbx, JB_RBX(REGS)
/* Save 2: Value of the rsp *after* returning */
movq %rsp, JB_RSP(REGS)
/* Fix up the return stack */
push %rsi
/* Save registers */
/* Storage order: %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15, %rip */
movq %rbp, JB_RBP(REGS) /* Save 3: rbp */
movq %r12, JB_R12(REGS) /* Save 4: r12 */
movq %r13, JB_R13(REGS) /* Save 5: r13 */
movq %r14, JB_R14(REGS) /* Save 6: r14 */
movq %r15, JB_R15(REGS) /* Save 7: r15 */
movq %rsi, JB_RSI(REGS) /* Save 8: Return address */
ret
#ifdef __ELF__
.size SYMBOL(setjmp), . - SYMBOL(setjmp)
#endif
.align 4
.globl SYMBOL(longjmp)
#ifdef __ELF__
.type SYMBOL(longjmp), @function
#endif
SYMBOL(longjmp):
/* Setup return value */
movl %esi,%eax
/* Restore registers */
movq JB_RBX(REGS),%rbx /* Load 1: rbx */
movq JB_RSP(REGS),%rsp /* Load 2: rsp */
movq JB_RBP(REGS),%rbp /* Load 3: rdi */
movq JB_R12(REGS),%r12 /* Load 4: r12 */
movq JB_R13(REGS),%r13 /* Load 5: r13 */
movq JB_R14(REGS),%r14 /* Load 6: r14 */
movq JB_R15(REGS),%r15 /* Load 7: rbp */
/* Jump to the saved return address (rsi) */
jmp *JB_RSI(REGS)
#ifdef __ELF__
.size SYMBOL(longjmp), . - SYMBOL(longjmp)
#endif