forked from Imagelibrary/binutils-gdb
09a31034a7
Refactor the syscall assembly code in gdb/testsuite/lib/my-syscalls.S behind a SYSCALL macro so that it's easy to add new syscalls without duplicating code. Note that the way the macro is implemented, it only works correctly for syscalls with up to 3 arguments, and, if the syscall doesn't return (the macro doesn't bother to save/restore callee-saved registers). The following patch will want to use the macro to define a wrapper for the "exit" syscall, so the limitations continue to be sufficient. Change-Id: I8acf1463b11a084d6b4579aaffb49b5d0dea3bba
73 lines
2.1 KiB
ArmAsm
73 lines
2.1 KiB
ArmAsm
/* This testcase is part of GDB, the GNU debugger.
|
|
|
|
Copyright 2020-2023 Free Software Foundation, Inc.
|
|
|
|
This program 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.
|
|
|
|
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
/* This file implements simple Linux syscall wrappers, to be used by tests that
|
|
need to know exactly where the syscall instructions are. */
|
|
|
|
#include <asm/unistd.h>
|
|
|
|
/* The SYSCALL macro below current supports calling syscalls with up
|
|
to 3 arguments, and, assumes the syscall never returns, like exec
|
|
and exit. If you need to call syscalls with more arguments or you
|
|
need to call syscalls that actually return, you'll need to update
|
|
the macros. We don't bother with optimizing setting up fewer
|
|
arguments for syscalls that take fewer arguments, as we're not
|
|
optimizating for speed or space, but for maintainability. */
|
|
|
|
#if defined(__x86_64__)
|
|
|
|
#define SYSCALL(NAME, NR) \
|
|
.global NAME ;\
|
|
NAME: ;\
|
|
mov $NR, %rax ;\
|
|
/* rdi, rsi and rdx already contain the right arguments. */ \
|
|
NAME ## _syscall: ;\
|
|
syscall ;\
|
|
ret ;
|
|
|
|
#elif defined(__i386__)
|
|
|
|
#define SYSCALL(NAME, NR) \
|
|
.global NAME ;\
|
|
NAME: ;\
|
|
mov $NR, %eax ;\
|
|
mov 4(%esp), %ebx ;\
|
|
mov 8(%esp), %ecx ;\
|
|
mov 12(%esp), %edx ;\
|
|
NAME ## _syscall: ;\
|
|
int $0x80 ;\
|
|
ret
|
|
|
|
#elif defined(__aarch64__)
|
|
|
|
#define SYSCALL(NAME, NR) \
|
|
.global NAME ;\
|
|
NAME: ;\
|
|
mov x8, NR ;\
|
|
/* x0, x1 and x2 already contain the right arguments. */ \
|
|
NAME ## _syscall: ;\
|
|
svc #0
|
|
|
|
#else
|
|
# error "Unsupported architecture"
|
|
#endif
|
|
|
|
SYSCALL (my_execve, __NR_execve)
|
|
|
|
.section .note.GNU-stack,"",@progbits
|