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223 lines
5.1 KiB
223 lines
5.1 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org> |
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* Copyright (C) 2001 MIPS Technologies, Inc. |
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* Copyright (C) 2004 Thiemo Seufer |
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* Copyright (C) 2014 Imagination Technologies Ltd. |
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*/ |
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#include <linux/errno.h> |
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#include <asm/asm.h> |
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#include <asm/asmmacro.h> |
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#include <asm/irqflags.h> |
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#include <asm/mipsregs.h> |
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#include <asm/regdef.h> |
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#include <asm/stackframe.h> |
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#include <asm/isadep.h> |
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#include <asm/sysmips.h> |
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#include <asm/thread_info.h> |
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#include <asm/unistd.h> |
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#include <asm/war.h> |
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#include <asm/asm-offsets.h> |
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.align 5 |
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NESTED(handle_sys, PT_SIZE, sp) |
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.set noat |
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SAVE_SOME |
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TRACE_IRQS_ON_RELOAD |
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STI |
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.set at |
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lw t1, PT_EPC(sp) # skip syscall on return |
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addiu t1, 4 # skip to next instruction |
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sw t1, PT_EPC(sp) |
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sw a3, PT_R26(sp) # save a3 for syscall restarting |
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/* |
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* More than four arguments. Try to deal with it by copying the |
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* stack arguments from the user stack to the kernel stack. |
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* This Sucks (TM). |
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*/ |
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lw t0, PT_R29(sp) # get old user stack pointer |
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/* |
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* We intentionally keep the kernel stack a little below the top of |
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* userspace so we don't have to do a slower byte accurate check here. |
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*/ |
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addu t4, t0, 32 |
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bltz t4, bad_stack # -> sp is bad |
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/* |
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* Ok, copy the args from the luser stack to the kernel stack. |
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*/ |
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.set push |
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.set noreorder |
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.set nomacro |
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load_a4: user_lw(t5, 16(t0)) # argument #5 from usp |
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load_a5: user_lw(t6, 20(t0)) # argument #6 from usp |
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load_a6: user_lw(t7, 24(t0)) # argument #7 from usp |
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load_a7: user_lw(t8, 28(t0)) # argument #8 from usp |
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loads_done: |
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sw t5, 16(sp) # argument #5 to ksp |
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sw t6, 20(sp) # argument #6 to ksp |
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sw t7, 24(sp) # argument #7 to ksp |
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sw t8, 28(sp) # argument #8 to ksp |
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.set pop |
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.section __ex_table,"a" |
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PTR load_a4, bad_stack_a4 |
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PTR load_a5, bad_stack_a5 |
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PTR load_a6, bad_stack_a6 |
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PTR load_a7, bad_stack_a7 |
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.previous |
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lw t0, TI_FLAGS($28) # syscall tracing enabled? |
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li t1, _TIF_WORK_SYSCALL_ENTRY |
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and t0, t1 |
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bnez t0, syscall_trace_entry # -> yes |
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syscall_common: |
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subu v0, v0, __NR_O32_Linux # check syscall number |
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sltiu t0, v0, __NR_O32_Linux_syscalls |
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beqz t0, illegal_syscall |
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sll t0, v0, 2 |
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la t1, sys_call_table |
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addu t1, t0 |
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lw t2, (t1) # syscall routine |
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beqz t2, illegal_syscall |
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jalr t2 # Do The Real Thing (TM) |
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li t0, -EMAXERRNO - 1 # error? |
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sltu t0, t0, v0 |
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sw t0, PT_R7(sp) # set error flag |
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beqz t0, 1f |
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lw t1, PT_R2(sp) # syscall number |
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negu v0 # error |
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sw t1, PT_R0(sp) # save it for syscall restarting |
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1: sw v0, PT_R2(sp) # result |
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o32_syscall_exit: |
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j syscall_exit_partial |
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/* ------------------------------------------------------------------------ */ |
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syscall_trace_entry: |
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SAVE_STATIC |
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move a0, sp |
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/* |
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* syscall number is in v0 unless we called syscall(__NR_###) |
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* where the real syscall number is in a0 |
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*/ |
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move a1, v0 |
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subu t2, v0, __NR_O32_Linux |
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bnez t2, 1f /* __NR_syscall at offset 0 */ |
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lw a1, PT_R4(sp) |
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1: jal syscall_trace_enter |
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bltz v0, 1f # seccomp failed? Skip syscall |
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RESTORE_STATIC |
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lw v0, PT_R2(sp) # Restore syscall (maybe modified) |
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lw a0, PT_R4(sp) # Restore argument registers |
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lw a1, PT_R5(sp) |
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lw a2, PT_R6(sp) |
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lw a3, PT_R7(sp) |
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j syscall_common |
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1: j syscall_exit |
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/* ------------------------------------------------------------------------ */ |
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/* |
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* Our open-coded access area sanity test for the stack pointer |
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* failed. We probably should handle this case a bit more drastic. |
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*/ |
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bad_stack: |
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li v0, EFAULT |
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sw v0, PT_R2(sp) |
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li t0, 1 # set error flag |
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sw t0, PT_R7(sp) |
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j o32_syscall_exit |
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bad_stack_a4: |
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li t5, 0 |
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b load_a5 |
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bad_stack_a5: |
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li t6, 0 |
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b load_a6 |
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bad_stack_a6: |
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li t7, 0 |
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b load_a7 |
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bad_stack_a7: |
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li t8, 0 |
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b loads_done |
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/* |
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* The system call does not exist in this kernel |
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*/ |
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illegal_syscall: |
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li v0, ENOSYS # error |
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sw v0, PT_R2(sp) |
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li t0, 1 # set error flag |
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sw t0, PT_R7(sp) |
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j o32_syscall_exit |
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END(handle_sys) |
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LEAF(sys_syscall) |
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subu t0, a0, __NR_O32_Linux # check syscall number |
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sltiu v0, t0, __NR_O32_Linux_syscalls |
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beqz t0, einval # do not recurse |
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sll t1, t0, 2 |
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beqz v0, einval |
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lw t2, sys_call_table(t1) # syscall routine |
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move a0, a1 # shift argument registers |
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move a1, a2 |
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move a2, a3 |
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lw a3, 16(sp) |
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lw t4, 20(sp) |
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lw t5, 24(sp) |
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lw t6, 28(sp) |
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sw t4, 16(sp) |
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sw t5, 20(sp) |
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sw t6, 24(sp) |
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jr t2 |
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/* Unreached */ |
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einval: li v0, -ENOSYS |
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jr ra |
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END(sys_syscall) |
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#ifdef CONFIG_MIPS_MT_FPAFF |
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/* |
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* For FPU affinity scheduling on MIPS MT processors, we need to |
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* intercept sys_sched_xxxaffinity() calls until we get a proper hook |
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* in kernel/sched/core.c. Considered only temporary we only support |
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* these hooks for the 32-bit kernel - there is no MIPS64 MT processor |
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* atm. |
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*/ |
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#define sys_sched_setaffinity mipsmt_sys_sched_setaffinity |
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#define sys_sched_getaffinity mipsmt_sys_sched_getaffinity |
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#endif /* CONFIG_MIPS_MT_FPAFF */ |
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#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native) |
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#define __SYSCALL(nr, entry) PTR entry |
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.align 2 |
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.type sys_call_table, @object |
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EXPORT(sys_call_table) |
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#include <asm/syscall_table_o32.h>
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