musl/src/internal/mips/syscall.s

.set    noreorder

.global __syscall
.type   __syscall,@function
__syscall:
	move    $25, $4
	move    $4, $5
	move    $5, $6
	move    $6, $7
	lw      $7, 16($sp)
	lw      $8, 20($sp)
	lw      $9, 24($sp)
	subu    $sp, $sp, 32
	sw      $8, 16($sp)
	sw      $9, 20($sp)
	move    $2, $25
	syscall
	beq     $7, $0, 1f
	addu    $sp, $sp, 32
	subu    $2, $0, $2
1:	jr      $ra
	nop
initial version of mips (o32) port, based on work by Richard Pennington (rdp) basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link. 2012-07-11 04:22:13 -04:00			`.set noreorder`

			`.global __syscall`
			`.type __syscall,@function`
			`__syscall:`
fix broken mips syscall asm this code was using $10 to save the syscall number, but $10 is not necessarily preserved by the kernel across syscalls. only mattered for syscalls that got interrupted by a signal and restarted. as far as i can tell, $25 is preserved by the kernel across syscalls. 2012-09-09 00:55:31 -04:00			`move $25, $4`
initial version of mips (o32) port, based on work by Richard Pennington (rdp) basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link. 2012-07-11 04:22:13 -04:00			`move $4, $5`
			`move $5, $6`
			`move $6, $7`
			`lw $7, 16($sp)`
			`lw $8, 20($sp)`
			`lw $9, 24($sp)`
			`subu $sp, $sp, 32`
			`sw $8, 16($sp)`
			`sw $9, 20($sp)`
fix broken mips syscall asm this code was using $10 to save the syscall number, but $10 is not necessarily preserved by the kernel across syscalls. only mattered for syscalls that got interrupted by a signal and restarted. as far as i can tell, $25 is preserved by the kernel across syscalls. 2012-09-09 00:55:31 -04:00			`move $2, $25`
initial version of mips (o32) port, based on work by Richard Pennington (rdp) basically, this version of the code was obtained by starting with rdp's work from his ellcc source tree, adapting it to musl's build system and coding style, auditing the bits headers for discrepencies with kernel definitions or glibc/LSB ABI or large file issues, fixing up incompatibility with the old binutils from aboriginal linux, and adding some new special cases to deal with the oddities of sigaction and pipe syscall interfaces on mips. at present, minimal test programs work, but some interfaces are broken or missing. threaded programs probably will not link. 2012-07-11 04:22:13 -04:00			`syscall`
			`beq $7, $0, 1f`
			`addu $sp, $sp, 32`
			`subu $2, $0, $2`
			`1: jr $ra`
			`nop`