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>
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/*
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* This file, when run through CPP produces a list of syscall numbers
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* in the order of systbl.h. That way we can check for gaps and syscalls
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* that are out of order.
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*
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* Unfortunately, we cannot check for the correct ordering of entries
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* using SYSX().
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*
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* Copyright © IBM Corporation
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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/unistd.h>
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#define SYSCALL(func) __NR_##func
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#define COMPAT_SYS(func) __NR_##func
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#define PPC_SYS(func) __NR_##func
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#ifdef CONFIG_PPC64
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#define OLDSYS(func) -1
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#define SYS32ONLY(func) -1
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#define PPC64ONLY(func) __NR_##func
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#else
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#define OLDSYS(func) __NR_old##func
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#define SYS32ONLY(func) __NR_##func
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#define PPC64ONLY(func) -1
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#endif
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#define SYSX(f, f3264, f32) -1
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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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/* Just insert a marker for ni_syscalls */
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#define __NR_ni_syscall -1
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/*
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* These are the known exceptions.
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* Hopefully, there will be no more.
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*/
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#define __NR_llseek __NR__llseek
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#undef __NR_umount
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#define __NR_umount __NR_umount2
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#define __NR_old_getrlimit __NR_getrlimit
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#define __NR_newstat __NR_stat
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#define __NR_newlstat __NR_lstat
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#define __NR_newfstat __NR_fstat
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#define __NR_newuname __NR_uname
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#define __NR_sysctl __NR__sysctl
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#define __NR_olddebug_setcontext __NR_sys_debug_setcontext
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/* We call sys_ugetrlimit for syscall number __NR_getrlimit */
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#define getrlimit ugetrlimit
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START_TABLE
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#include <asm/systbl.h>
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END_TABLE __NR_syscalls
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