529d235a0e
We currently have a "special" syscall for switching endianness. This is syscall number 0x1ebe, which is handled explicitly in the 64-bit syscall exception entry. That has a few problems, firstly the syscall number is outside of the usual range, which confuses various tools. For example strace doesn't recognise the syscall at all. Secondly it's handled explicitly as a special case in the syscall exception entry, which is complicated enough without it. As a first step toward removing the special syscall, we need to add a regular syscall that implements the same functionality. The logic is simple, it simply toggles the MSR_LE bit in the userspace MSR. This is the same as the special syscall, with the caveat that the special syscall clobbers fewer registers. This version clobbers r9-r12, XER, CTR, and CR0-1,5-7. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
51 lines
1.7 KiB
ArmAsm
51 lines
1.7 KiB
ArmAsm
/*
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* This file contains the table of syscall-handling functions.
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras.
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*
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* Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
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* PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <asm/ppc_asm.h>
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#ifdef CONFIG_PPC64
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#define SYSCALL(func) .llong DOTSYM(sys_##func),DOTSYM(sys_##func)
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#define COMPAT_SYS(func) .llong DOTSYM(sys_##func),DOTSYM(compat_sys_##func)
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#define PPC_SYS(func) .llong DOTSYM(ppc_##func),DOTSYM(ppc_##func)
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#define OLDSYS(func) .llong DOTSYM(sys_ni_syscall),DOTSYM(sys_ni_syscall)
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#define SYS32ONLY(func) .llong DOTSYM(sys_ni_syscall),DOTSYM(compat_sys_##func)
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#define PPC64ONLY(func) .llong DOTSYM(ppc_##func),DOTSYM(sys_ni_syscall)
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#define SYSX(f, f3264, f32) .llong DOTSYM(f),DOTSYM(f3264)
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#else
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#define SYSCALL(func) .long sys_##func
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#define COMPAT_SYS(func) .long sys_##func
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#define PPC_SYS(func) .long ppc_##func
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#define OLDSYS(func) .long sys_##func
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#define SYS32ONLY(func) .long sys_##func
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#define PPC64ONLY(func) .long sys_ni_syscall
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#define SYSX(f, f3264, f32) .long f32
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#endif
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#define SYSCALL_SPU(func) SYSCALL(func)
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#define COMPAT_SYS_SPU(func) COMPAT_SYS(func)
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#define PPC_SYS_SPU(func) PPC_SYS(func)
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#define SYSX_SPU(f, f3264, f32) SYSX(f, f3264, f32)
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.section .rodata,"a"
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#ifdef CONFIG_PPC64
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.p2align 3
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#endif
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.globl sys_call_table
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sys_call_table:
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#include <asm/systbl.h>
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