diff options
Diffstat (limited to 'arch/mips/kernel/scall64-n64.S')
| -rw-r--r-- | arch/mips/kernel/scall64-n64.S | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/arch/mips/kernel/scall64-n64.S b/arch/mips/kernel/scall64-n64.S new file mode 100644 index 000000000..23b2e2b16 --- /dev/null +++ b/arch/mips/kernel/scall64-n64.S @@ -0,0 +1,117 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * Copyright (C) 2001 MIPS Technologies, Inc. + */ +#include <linux/errno.h> +#include <asm/asm.h> +#include <asm/asmmacro.h> +#include <asm/irqflags.h> +#include <asm/mipsregs.h> +#include <asm/regdef.h> +#include <asm/stackframe.h> +#include <asm/asm-offsets.h> +#include <asm/sysmips.h> +#include <asm/thread_info.h> +#include <asm/unistd.h> +#include <asm/war.h> + +#ifndef CONFIG_BINFMT_ELF32 +/* Neither O32 nor N32, so define handle_sys here */ +#define handle_sys64 handle_sys +#endif + + .align 5 +NESTED(handle_sys64, PT_SIZE, sp) +#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) + /* + * When 32-bit compatibility is configured scall_o32.S + * already did this. + */ + .set noat + SAVE_SOME + TRACE_IRQS_ON_RELOAD + STI + .set at +#endif + +#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) + ld t1, PT_EPC(sp) # skip syscall on return + daddiu t1, 4 # skip to next instruction + sd t1, PT_EPC(sp) +#endif + + sd a3, PT_R26(sp) # save a3 for syscall restarting + + li t1, _TIF_WORK_SYSCALL_ENTRY + LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? + and t0, t1, t0 + bnez t0, syscall_trace_entry + +syscall_common: + dsubu t2, v0, __NR_64_Linux + sltiu t0, t2, __NR_64_Linux_syscalls + beqz t0, illegal_syscall + + dsll t0, t2, 3 # offset into table + dla t2, sys_call_table + daddu t0, t2, t0 + ld t2, (t0) # syscall routine + beqz t2, illegal_syscall + + jalr t2 # Do The Real Thing (TM) + + li t0, -EMAXERRNO - 1 # error? + sltu t0, t0, v0 + sd t0, PT_R7(sp) # set error flag + beqz t0, 1f + + ld t1, PT_R2(sp) # syscall number + dnegu v0 # error + sd t1, PT_R0(sp) # save it for syscall restarting +1: sd v0, PT_R2(sp) # result + +n64_syscall_exit: + j syscall_exit_partial + +/* ------------------------------------------------------------------------ */ + +syscall_trace_entry: + SAVE_STATIC + move a0, sp + move a1, v0 + jal syscall_trace_enter + + bltz v0, 1f # seccomp failed? Skip syscall + + RESTORE_STATIC + ld v0, PT_R2(sp) # Restore syscall (maybe modified) + ld a0, PT_R4(sp) # Restore argument registers + ld a1, PT_R5(sp) + ld a2, PT_R6(sp) + ld a3, PT_R7(sp) + ld a4, PT_R8(sp) + ld a5, PT_R9(sp) + j syscall_common + +1: j syscall_exit + +illegal_syscall: + /* This also isn't a 64-bit syscall, throw an error. */ + li v0, ENOSYS # error + sd v0, PT_R2(sp) + li t0, 1 # set error flag + sd t0, PT_R7(sp) + j n64_syscall_exit + END(handle_sys64) + +#define __SYSCALL(nr, entry) PTR entry + .align 3 + .type sys_call_table, @object +EXPORT(sys_call_table) +#include <asm/syscall_table_64_n64.h> +#undef __SYSCALL |