| /* |
| * 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 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/thread_info.h> |
| #include <asm/unistd.h> |
| |
| #ifndef CONFIG_MIPS32_O32 |
| /* No O32, so define handle_sys here */ |
| #define handle_sysn32 handle_sys |
| #endif |
| |
| .align 5 |
| NESTED(handle_sysn32, PT_SIZE, sp) |
| #ifndef CONFIG_MIPS32_O32 |
| .set noat |
| SAVE_SOME |
| TRACE_IRQS_ON_RELOAD |
| STI |
| .set at |
| #endif |
| |
| dsubu t0, v0, __NR_N32_Linux # check syscall number |
| sltiu t0, t0, __NR_N32_Linux_syscalls |
| |
| #ifndef CONFIG_MIPS32_O32 |
| ld t1, PT_EPC(sp) # skip syscall on return |
| daddiu t1, 4 # skip to next instruction |
| sd t1, PT_EPC(sp) |
| #endif |
| beqz t0, not_n32_scall |
| |
| 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, n32_syscall_trace_entry |
| |
| syscall_common: |
| dsll t0, v0, 3 # offset into table |
| ld t2, (sysn32_call_table - (__NR_N32_Linux * 8))(t0) |
| |
| 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 |
| |
| j syscall_exit_partial |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| n32_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) |
| |
| dsubu t2, v0, __NR_N32_Linux # check (new) syscall number |
| sltiu t0, t2, __NR_N32_Linux_syscalls |
| beqz t0, not_n32_scall |
| |
| j syscall_common |
| |
| 1: j syscall_exit |
| |
| not_n32_scall: |
| /* This is not an n32 compatibility syscall, pass it on to |
| the n64 syscall handlers. */ |
| j handle_sys64 |
| |
| END(handle_sysn32) |
| |
| #define __SYSCALL(nr, entry) PTR entry |
| .type sysn32_call_table, @object |
| EXPORT(sysn32_call_table) |
| #include <asm/syscall_table_64_n32.h> |
| #undef __SYSCALL |
