mips/kernel/scall32-o32.S

6  * Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
23 #include <asm/asm-offsets.h>
54 	bltz	t5, bad_stack		# -> sp is bad
86 	bnez	t0, syscall_trace_entry # -> yes
88 	subu	v0, v0, __NR_O32_Linux	# check syscall number
89 	sltiu	t0, v0, __NR_O32_Linux_syscalls
92 	sll	t0, v0, 2
101 	li	t0, -EMAXERRNO - 1	# error?
102 	sltu	t0, t0, v0
104 	beqz	t0, 1f
107 	negu	v0			# error
109 1:	sw	v0, PT_R2(sp)		# result
114 /* ------------------------------------------------------------------------ */
121 	 * syscall number is in v0 unless we called syscall(__NR_###)
124 	move	a1, v0
125 	subu	t2, v0,  __NR_O32_Linux
126 	bnez	t2, 1f /* __NR_syscall at offset 0 */
129 1:	jal	syscall_trace_enter
131 	bltz	v0, 1f			# seccomp failed? Skip syscall
134 	lw	v0, PT_R2(sp)		# Restore syscall (maybe modified)
141 1:	j	syscall_exit
143 /* ------------------------------------------------------------------------ */
146 	 * Our open-coded access area sanity test for the stack pointer
150 	li	v0, EFAULT
151 	sw	v0, PT_R2(sp)
152 	li	t0, 1				# set error flag
176 	li	v0, ENOSYS			# error
177 	sw	v0, PT_R2(sp)
178 	li	t0, 1				# set error flag
185 	sltiu	v0, t0, __NR_O32_Linux_syscalls
188 	beqz	v0, einval
204 einval: li	v0, -ENOSYS
213 	 * these hooks for the 32-bit kernel - there is no MIPS64 MT processor