| /* |
| * 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 |
