mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 19:30:52 +07:00
dc7077f89a
The __SYSCALL macro's arguments are system call number, system call entry name and number of arguments for the system call. Argument- nargs in __SYSCALL(nr, entry, nargs) is neither calculated nor used anywhere. So it would be better to keep the implementaion as __SYSCALL(nr, entry). This will unifies the implementation with some other architetures too. Signed-off-by: Firoz Khan <firoz.khan@linaro.org> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: y2038@lists.linaro.org Cc: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: arnd@arndb.de Cc: deepa.kernel@gmail.com Cc: marcin.juszkiewicz@linaro.org
118 lines
2.7 KiB
ArmAsm
118 lines
2.7 KiB
ArmAsm
/*
|
|
* 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
|