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221 lines
5.1 KiB
221 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 - 2000, 2001 by Ralf Baechle |
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
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* Copyright (C) 2001 MIPS Technologies, Inc. |
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* Copyright (C) 2004 Thiemo Seufer |
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* |
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* Hairy, the userspace application uses a different argument passing |
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* convention than the kernel, so we have to translate things from o32 |
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* to ABI64 calling convention. 64-bit syscalls are also processed |
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* here for now. |
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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/thread_info.h> |
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#include <asm/unistd.h> |
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#include <asm/sysmips.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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ld t1, PT_EPC(sp) # skip syscall on return |
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dsubu t0, v0, __NR_O32_Linux # check syscall number |
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sltiu t0, t0, __NR_O32_Linux_syscalls |
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daddiu t1, 4 # skip to next instruction |
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sd t1, PT_EPC(sp) |
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beqz t0, not_o32_scall |
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#if 0 |
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SAVE_ALL |
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move a1, v0 |
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ASM_PRINT("Scall %ld\n") |
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RESTORE_ALL |
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#endif |
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/* We don't want to stumble over broken sign extensions from |
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userland. O32 does never use the upper half. */ |
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sll a0, a0, 0 |
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sll a1, a1, 0 |
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sll a2, a2, 0 |
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sll a3, a3, 0 |
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sd 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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* 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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ld t0, PT_R29(sp) # get old user stack pointer |
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daddu t1, t0, 32 |
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bltz t1, bad_stack |
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load_a4: lw a4, 16(t0) # argument #5 from usp |
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load_a5: lw a5, 20(t0) # argument #6 from usp |
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load_a6: lw a6, 24(t0) # argument #7 from usp |
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load_a7: lw a7, 28(t0) # argument #8 from usp |
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loads_done: |
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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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li t1, _TIF_WORK_SYSCALL_ENTRY |
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LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? |
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and t0, t1, t0 |
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bnez t0, trace_a_syscall |
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syscall_common: |
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dsll t0, v0, 3 # offset into table |
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ld t2, (sys32_call_table - (__NR_O32_Linux * 8))(t0) |
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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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sd t0, PT_R7(sp) # set error flag |
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beqz t0, 1f |
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ld t1, PT_R2(sp) # syscall number |
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dnegu v0 # error |
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sd t1, PT_R0(sp) # save it for syscall restarting |
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1: sd 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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trace_a_syscall: |
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SAVE_STATIC |
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sd a4, PT_R8(sp) # Save argument registers |
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sd a5, PT_R9(sp) |
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sd a6, PT_R10(sp) |
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sd a7, PT_R11(sp) # For indirect syscalls |
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move a0, sp |
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/* |
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* absolute 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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* note: NR_syscall is the first O32 syscall but the macro is |
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* only defined when compiling with -mabi=32 (CONFIG_32BIT) |
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* therefore __NR_O32_Linux is used (4000) |
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*/ |
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.set push |
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.set reorder |
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subu t1, v0, __NR_O32_Linux |
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move a1, v0 |
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bnez t1, 1f /* __NR_syscall at offset 0 */ |
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ld a1, PT_R4(sp) /* Arg1 for __NR_syscall case */ |
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.set pop |
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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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ld v0, PT_R2(sp) # Restore syscall (maybe modified) |
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ld a0, PT_R4(sp) # Restore argument registers |
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ld a1, PT_R5(sp) |
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ld a2, PT_R6(sp) |
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ld a3, PT_R7(sp) |
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ld a4, PT_R8(sp) |
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ld a5, PT_R9(sp) |
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ld a6, PT_R10(sp) |
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ld a7, PT_R11(sp) # For indirect syscalls |
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dsubu t0, v0, __NR_O32_Linux # check (new) syscall number |
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sltiu t0, t0, __NR_O32_Linux_syscalls |
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beqz t0, not_o32_scall |
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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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* The stackpointer for a call with more than 4 arguments is bad. |
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*/ |
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bad_stack: |
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li v0, EFAULT |
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sd v0, PT_R2(sp) |
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li t0, 1 # set error flag |
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sd t0, PT_R7(sp) |
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j o32_syscall_exit |
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bad_stack_a4: |
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li a4, 0 |
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b load_a5 |
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bad_stack_a5: |
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li a5, 0 |
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b load_a6 |
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bad_stack_a6: |
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li a6, 0 |
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b load_a7 |
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bad_stack_a7: |
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li a7, 0 |
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b loads_done |
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not_o32_scall: |
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/* |
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* This is not an o32 compatibility syscall, pass it on |
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* to the 64-bit syscall handlers. |
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*/ |
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#ifdef CONFIG_MIPS32_N32 |
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j handle_sysn32 |
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#else |
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j handle_sys64 |
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#endif |
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END(handle_sys) |
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LEAF(sys32_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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dsll t1, t0, 3 |
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beqz v0, einval |
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ld t2, sys32_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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move a3, a4 |
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move a4, a5 |
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move a5, a6 |
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move a6, a7 |
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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(sys32_syscall) |
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#define __SYSCALL(nr, entry) PTR entry |
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.align 3 |
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.type sys32_call_table,@object |
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EXPORT(sys32_call_table) |
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#include <asm/syscall_table_64_o32.h> |
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#undef __SYSCALL
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