6367e823ca
A build of GCC 13.2 will have stack protector enabled by default if it
was configured with --enable-default-ssp option. For such a compiler,
it is necessary to explicitly disable stack protector when linking
without standard libraries.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20230731091042.139159-3-akihiko.odaki@daynix.com>
[AJB: fix comment string typo]
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20231029145033.592566-3-alex.bennee@linaro.org>
(cherry picked from commit 580731dcc8)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
|
|
* MIPS o32 Linux syscall example
|
|
*
|
|
* http://www.linux-mips.org/wiki/RISC/os
|
|
* http://www.linux-mips.org/wiki/MIPSABIHistory
|
|
* http://www.linux.com/howtos/Assembly-HOWTO/mips.shtml
|
|
*
|
|
* mipsel-linux-gcc -nostdlib -mno-abicalls -fno-PIC -fno-stack-protector \
|
|
* -mabi=32 -O2 -static -o hello-mips hello-mips.c
|
|
*
|
|
*/
|
|
#define __NR_SYSCALL_BASE 4000
|
|
#define __NR_exit (__NR_SYSCALL_BASE+ 1)
|
|
#define __NR_write (__NR_SYSCALL_BASE+ 4)
|
|
|
|
static inline void exit1(int status)
|
|
{
|
|
register unsigned long __a0 asm("$4") = (unsigned long) status;
|
|
|
|
__asm__ __volatile__ (
|
|
" .set push \n"
|
|
" .set noreorder \n"
|
|
" li $2, %0 \n"
|
|
" syscall \n"
|
|
" .set pop "
|
|
:
|
|
: "i" (__NR_exit), "r" (__a0)
|
|
: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
|
|
"memory");
|
|
}
|
|
|
|
static inline int write(int fd, const char *buf, int len)
|
|
{
|
|
register unsigned long __a0 asm("$4") = (unsigned long) fd;
|
|
register unsigned long __a1 asm("$5") = (unsigned long) buf;
|
|
register unsigned long __a2 asm("$6") = (unsigned long) len;
|
|
register unsigned long __a3 asm("$7");
|
|
unsigned long __v0;
|
|
|
|
__asm__ __volatile__ (
|
|
" .set push \n"
|
|
" .set noreorder \n"
|
|
" li $2, %2 \n"
|
|
" syscall \n"
|
|
" move %0, $2 \n"
|
|
" .set pop "
|
|
: "=r" (__v0), "=r" (__a3)
|
|
: "i" (__NR_write), "r" (__a0), "r" (__a1), "r" (__a2)
|
|
: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
|
|
"memory");
|
|
|
|
/* if (__a3 == 0) */
|
|
return (int) __v0;
|
|
/*
|
|
errno = __v0;
|
|
return -1;
|
|
*/
|
|
}
|
|
|
|
void __start(void)
|
|
{
|
|
write (1, "Hello, World!\n", 14);
|
|
exit1(0);
|
|
}
|