5d66da3d71
The vDSO functions should have the same calling convention as a syscall. Unfortunately, they currently don't set the cr0.so bit which is used to indicate an error. This patch makes them clear this bit unconditionally since all functions currently succeed. The syscall fallback done by some of them will eventually override this if the syscall fails. This also changes the symbol version of all vdso exports to make sure glibc can differenciate between old and fixed calls for existing ones like __kernel_gettimeofday. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
86 lines
2 KiB
ArmAsm
86 lines
2 KiB
ArmAsm
/*
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* Access to the shared data page by the vDSO & syscall map
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*
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* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp.
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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 <linux/config.h>
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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/vdso.h>
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.text
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V_FUNCTION_BEGIN(__get_datapage)
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.cfi_startproc
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/* We don't want that exposed or overridable as we want other objects
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* to be able to bl directly to here
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*/
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.protected __get_datapage
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.hidden __get_datapage
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mflr r0
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.cfi_register lr,r0
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bcl 20,31,1f
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.global __kernel_datapage_offset;
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__kernel_datapage_offset:
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.long 0
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1:
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mflr r3
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mtlr r0
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lwz r0,0(r3)
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add r3,r0,r3
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blr
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.cfi_endproc
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V_FUNCTION_END(__get_datapage)
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/*
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* void *__kernel_get_syscall_map(unsigned int *syscall_count) ;
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*
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* returns a pointer to the syscall map. the map is agnostic to the
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* size of "long", unlike kernel bitops, it stores bits from top to
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* bottom so that memory actually contains a linear bitmap
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* check for syscall N by testing bit (0x80000000 >> (N & 0x1f)) of
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* 32 bits int at N >> 5.
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*/
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V_FUNCTION_BEGIN(__kernel_get_syscall_map)
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.cfi_startproc
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mflr r12
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.cfi_register lr,r12
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mr r4,r3
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bl __get_datapage@local
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mtlr r12
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addi r3,r3,CFG_SYSCALL_MAP32
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cmpli cr0,r4,0
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beqlr
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li r0,__NR_syscalls
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stw r0,0(r4)
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crclr cr0*4+so
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blr
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.cfi_endproc
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V_FUNCTION_END(__kernel_get_syscall_map)
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/*
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* void unsigned long long __kernel_get_tbfreq(void);
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*
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* returns the timebase frequency in HZ
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*/
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V_FUNCTION_BEGIN(__kernel_get_tbfreq)
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.cfi_startproc
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mflr r12
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.cfi_register lr,r12
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bl __get_datapage@local
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lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3)
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lwz r3,CFG_TB_TICKS_PER_SEC(r3)
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mtlr r12
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crclr cr0*4+so
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blr
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.cfi_endproc
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V_FUNCTION_END(__kernel_get_tbfreq)
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