mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 14:50:17 +00:00
bbabb868cd
The tunables framework needs to execute syscall early in process
initialization, before the TCB is available for consumption. This
behavior conflicts with powerpc{|64|64le}'s lock elision code, that
checks the TCB before trying to abort transactions immediately before
executing a syscall.
This patch adds a powerpc-specific implementation of __access_noerrno
that does not abort transactions before the executing syscall.
Tested on powerpc{|64|64le}.
[BZ #22685]
* sysdeps/powerpc/powerpc32/sysdep.h (ABORT_TRANSACTION_IMPL): Renamed
from ABORT_TRANSACTION.
(ABORT_TRANSACTION): Redirect to ABORT_TRANSACTION_IMPL.
* sysdeps/powerpc/powerpc64/sysdep.h (ABORT_TRANSACTION,
ABORT_TRANSACTION_IMPL): Likewise.
* sysdeps/unix/sysv/linux/powerpc/not-errno.h: New file. Reuse
Linux code, but remove the code that aborts transactions.
Signed-off-by: Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
(cherry picked from commit 4612268a0a
)
418 lines
10 KiB
C
418 lines
10 KiB
C
/* Assembly macros for 64-bit PowerPC.
|
|
Copyright (C) 2002-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdeps/powerpc/sysdep.h>
|
|
|
|
#ifdef __ASSEMBLER__
|
|
|
|
/* Stack frame offsets. */
|
|
#define FRAME_BACKCHAIN 0
|
|
#define FRAME_CR_SAVE 8
|
|
#define FRAME_LR_SAVE 16
|
|
#if _CALL_ELF != 2
|
|
#define FRAME_MIN_SIZE 112
|
|
#define FRAME_MIN_SIZE_PARM 112
|
|
#define FRAME_TOC_SAVE 40
|
|
#define FRAME_PARM_SAVE 48
|
|
#else
|
|
#define FRAME_MIN_SIZE 32
|
|
#define FRAME_MIN_SIZE_PARM 96
|
|
#define FRAME_TOC_SAVE 24
|
|
#define FRAME_PARM_SAVE 32
|
|
#endif
|
|
|
|
/* Support macros for CALL_MCOUNT. */
|
|
.macro SAVE_ARG NARG
|
|
.if \NARG
|
|
SAVE_ARG \NARG-1
|
|
std 2+\NARG,-FRAME_MIN_SIZE_PARM+FRAME_PARM_SAVE-8+8*(\NARG)(1)
|
|
.endif
|
|
.endm
|
|
|
|
.macro REST_ARG NARG
|
|
.if \NARG
|
|
REST_ARG \NARG-1
|
|
ld 2+\NARG,FRAME_PARM_SAVE-8+8*(\NARG)(1)
|
|
.endif
|
|
.endm
|
|
|
|
.macro CFI_SAVE_ARG NARG
|
|
.if \NARG
|
|
CFI_SAVE_ARG \NARG-1
|
|
cfi_offset(2+\NARG,-FRAME_MIN_SIZE_PARM+FRAME_PARM_SAVE-8+8*(\NARG))
|
|
.endif
|
|
.endm
|
|
|
|
.macro CFI_REST_ARG NARG
|
|
.if \NARG
|
|
CFI_REST_ARG \NARG-1
|
|
cfi_restore(2+\NARG)
|
|
.endif
|
|
.endm
|
|
|
|
/* If compiled for profiling, call `_mcount' at the start of each function.
|
|
see ppc-mcount.S for more details. */
|
|
.macro CALL_MCOUNT NARG
|
|
#ifdef PROF
|
|
mflr r0
|
|
SAVE_ARG \NARG
|
|
std r0,FRAME_LR_SAVE(r1)
|
|
stdu r1,-FRAME_MIN_SIZE_PARM(r1)
|
|
cfi_adjust_cfa_offset(FRAME_MIN_SIZE_PARM)
|
|
cfi_offset(lr,FRAME_LR_SAVE)
|
|
CFI_SAVE_ARG \NARG
|
|
bl JUMPTARGET (_mcount)
|
|
#ifndef SHARED
|
|
nop
|
|
#endif
|
|
ld r0,FRAME_MIN_SIZE_PARM+FRAME_LR_SAVE(r1)
|
|
REST_ARG \NARG
|
|
mtlr r0
|
|
addi r1,r1,FRAME_MIN_SIZE_PARM
|
|
cfi_adjust_cfa_offset(-FRAME_MIN_SIZE_PARM)
|
|
cfi_restore(lr)
|
|
CFI_REST_ARG \NARG
|
|
#endif
|
|
.endm
|
|
|
|
#if _CALL_ELF != 2
|
|
|
|
/* Macro to prepare for calling via a function pointer. */
|
|
.macro PPC64_LOAD_FUNCPTR PTR
|
|
ld r12,0(\PTR)
|
|
ld r2,8(\PTR)
|
|
mtctr r12
|
|
ld r11,16(\PTR)
|
|
.endm
|
|
|
|
#ifdef USE_PPC64_OVERLAPPING_OPD
|
|
# define OPD_ENT(name) .quad BODY_LABEL (name), .TOC.@tocbase
|
|
#else
|
|
# define OPD_ENT(name) .quad BODY_LABEL (name), .TOC.@tocbase, 0
|
|
#endif
|
|
|
|
#define ENTRY_1(name) \
|
|
.type BODY_LABEL(name),@function; \
|
|
.globl name; \
|
|
.section ".opd","aw"; \
|
|
.p2align 3;FUNC_LABEL(name): \
|
|
OPD_ENT (name); \
|
|
.previous
|
|
|
|
#define FUNC_LABEL(X) X
|
|
#define BODY_LABEL(X) .LY##X
|
|
#define ENTRY_2(name) \
|
|
.type name,@function; \
|
|
ENTRY_1(name)
|
|
#define END_2(name) \
|
|
.size name,.-BODY_LABEL(name); \
|
|
.size BODY_LABEL(name),.-BODY_LABEL(name)
|
|
#define LOCALENTRY(name)
|
|
|
|
#else /* _CALL_ELF == 2 */
|
|
|
|
/* Macro to prepare for calling via a function pointer. */
|
|
.macro PPC64_LOAD_FUNCPTR PTR
|
|
mr r12,\PTR
|
|
mtctr r12
|
|
.endm
|
|
|
|
#define FUNC_LABEL(X) X
|
|
#define BODY_LABEL(X) X
|
|
#define ENTRY_2(name) \
|
|
.globl name; \
|
|
.type name,@function
|
|
#define END_2(name) \
|
|
.size name,.-name
|
|
#define LOCALENTRY(name) \
|
|
1: addis r2,r12,.TOC.-1b@ha; \
|
|
addi r2,r2,.TOC.-1b@l; \
|
|
.localentry name,.-name
|
|
|
|
#endif /* _CALL_ELF */
|
|
|
|
.macro NOPS NARG
|
|
.if \NARG
|
|
NOPS \NARG-1
|
|
nop
|
|
.endif
|
|
.endm
|
|
|
|
.macro ENTRY_3 name, alignp2=2, nopwords=0
|
|
.text
|
|
ENTRY_2(\name)
|
|
.p2align \alignp2
|
|
NOPS \nopwords
|
|
BODY_LABEL(\name):
|
|
.endm
|
|
|
|
/* Use ENTRY_TOCLESS for functions that make no use of r2 and
|
|
guarantee r2 is unchanged on exit. Any function that has @toc or
|
|
@got relocs uses r2. Functions that call other functions via the
|
|
PLT use r2. Use ENTRY for functions that may use or change r2.
|
|
The first argument is the function name.
|
|
The optional second argument specifies alignment of the function's
|
|
code, as the logarithm base two of the byte alignment. For
|
|
example, a value of four aligns to a sixteen byte boundary.
|
|
The optional third argument specifies the number of NOPs to emit
|
|
before the start of the function's code. */
|
|
#ifndef PROF
|
|
#define ENTRY_TOCLESS(name, ...) \
|
|
ENTRY_3 name, ## __VA_ARGS__; \
|
|
cfi_startproc
|
|
|
|
#define ENTRY(name, ...) \
|
|
ENTRY_TOCLESS(name, ## __VA_ARGS__); \
|
|
LOCALENTRY(name)
|
|
#else
|
|
/* The call to _mcount is potentially via the plt, so profiling code
|
|
is never free of an r2 use. */
|
|
#define ENTRY_TOCLESS(name, ...) \
|
|
ENTRY_3 name, ## __VA_ARGS__; \
|
|
cfi_startproc; \
|
|
LOCALENTRY(name)
|
|
|
|
#define ENTRY(name, ...) \
|
|
ENTRY_TOCLESS(name, ## __VA_ARGS__)
|
|
#endif
|
|
|
|
/* Local labels stripped out by the linker. */
|
|
#undef L
|
|
#define L(x) .L##x
|
|
|
|
#define tostring(s) #s
|
|
#define stringify(s) tostring(s)
|
|
#define XGLUE(a,b) a##b
|
|
#define GLUE(a,b) XGLUE(a,b)
|
|
#define LT_LABEL(name) GLUE(.LT,name)
|
|
#define LT_LABELSUFFIX(name,suffix) GLUE(GLUE(.LT,name),suffix)
|
|
|
|
/* Support Traceback tables */
|
|
#define TB_ASM 0x000c000000000000
|
|
#define TB_GLOBALLINK 0x0000800000000000
|
|
#define TB_IS_EPROL 0x0000400000000000
|
|
#define TB_HAS_TBOFF 0x0000200000000000
|
|
#define TB_INT_PROC 0x0000100000000000
|
|
#define TB_HAS_CTL 0x0000080000000000
|
|
#define TB_TOCLESS 0x0000040000000000
|
|
#define TB_FP_PRESENT 0x0000020000000000
|
|
#define TB_LOG_ABORT 0x0000010000000000
|
|
#define TB_INT_HANDL 0x0000008000000000
|
|
#define TB_NAME_PRESENT 0x0000004000000000
|
|
#define TB_USES_ALLOCA 0x0000002000000000
|
|
#define TB_SAVES_CR 0x0000000200000000
|
|
#define TB_SAVES_LR 0x0000000100000000
|
|
#define TB_STORES_BC 0x0000000080000000
|
|
#define TB_FIXUP 0x0000000040000000
|
|
#define TB_FP_SAVED(fprs) (((fprs) & 0x3f) << 24)
|
|
#define TB_GPR_SAVED(gprs) (((fprs) & 0x3f) << 16)
|
|
#define TB_FIXEDPARMS(parms) (((parms) & 0xff) << 8)
|
|
#define TB_FLOATPARMS(parms) (((parms) & 0x7f) << 1)
|
|
#define TB_PARMSONSTK 0x0000000000000001
|
|
|
|
#define PPC_HIGHER(v) (((v) >> 32) & 0xffff)
|
|
#define TB_DEFAULT TB_ASM | TB_HAS_TBOFF | TB_NAME_PRESENT
|
|
|
|
#define TRACEBACK(name) \
|
|
LT_LABEL(name): ; \
|
|
.long 0 ; \
|
|
.quad TB_DEFAULT ; \
|
|
.long LT_LABEL(name)-BODY_LABEL(name) ; \
|
|
.short LT_LABELSUFFIX(name,_name_end)-LT_LABELSUFFIX(name,_name_start) ; \
|
|
LT_LABELSUFFIX(name,_name_start): ;\
|
|
.ascii stringify(name) ; \
|
|
LT_LABELSUFFIX(name,_name_end): ; \
|
|
.p2align 2
|
|
|
|
#define TRACEBACK_MASK(name,mask) \
|
|
LT_LABEL(name): ; \
|
|
.long 0 ; \
|
|
.quad TB_DEFAULT | mask ; \
|
|
.long LT_LABEL(name)-BODY_LABEL(name) ; \
|
|
.short LT_LABELSUFFIX(name,_name_end)-LT_LABELSUFFIX(name,_name_start) ; \
|
|
LT_LABELSUFFIX(name,_name_start): ;\
|
|
.ascii stringify(name) ; \
|
|
LT_LABELSUFFIX(name,_name_end): ; \
|
|
.p2align 2
|
|
|
|
/* END generates Traceback tables */
|
|
#undef END
|
|
#define END(name) \
|
|
cfi_endproc; \
|
|
TRACEBACK(name); \
|
|
END_2(name)
|
|
|
|
/* This form supports more informative traceback tables */
|
|
#define END_GEN_TB(name,mask) \
|
|
cfi_endproc; \
|
|
TRACEBACK_MASK(name,mask); \
|
|
END_2(name)
|
|
|
|
#if !IS_IN(rtld) && defined (ENABLE_LOCK_ELISION)
|
|
# define ABORT_TRANSACTION_IMPL \
|
|
cmpdi 13,0; \
|
|
beq 1f; \
|
|
lwz 0,TM_CAPABLE(13); \
|
|
cmpwi 0,0; \
|
|
beq 1f; \
|
|
li 11,_ABORT_SYSCALL; \
|
|
tabort. 11; \
|
|
.p2align 4; \
|
|
1:
|
|
#else
|
|
# define ABORT_TRANSACTION_IMPL
|
|
#endif
|
|
#define ABORT_TRANSACTION ABORT_TRANSACTION_IMPL
|
|
|
|
#define DO_CALL(syscall) \
|
|
ABORT_TRANSACTION \
|
|
li 0,syscall; \
|
|
sc
|
|
|
|
/* ppc64 is always PIC */
|
|
#undef JUMPTARGET
|
|
#define JUMPTARGET(name) FUNC_LABEL(name)
|
|
|
|
#define PSEUDO(name, syscall_name, args) \
|
|
.section ".text"; \
|
|
ENTRY (name); \
|
|
DO_CALL (SYS_ify (syscall_name))
|
|
|
|
#ifdef SHARED
|
|
#define TAIL_CALL_SYSCALL_ERROR \
|
|
b JUMPTARGET(__syscall_error)
|
|
#else
|
|
/* Static version might be linked into a large app with a toc exceeding
|
|
64k. We can't put a toc adjusting stub on a plain branch, so can't
|
|
tail call __syscall_error. */
|
|
#define TAIL_CALL_SYSCALL_ERROR \
|
|
.ifdef .Local_syscall_error; \
|
|
b .Local_syscall_error; \
|
|
.else; \
|
|
.Local_syscall_error: \
|
|
mflr 0; \
|
|
std 0,FRAME_LR_SAVE(1); \
|
|
stdu 1,-FRAME_MIN_SIZE(1); \
|
|
cfi_adjust_cfa_offset(FRAME_MIN_SIZE); \
|
|
cfi_offset(lr,FRAME_LR_SAVE); \
|
|
bl JUMPTARGET(__syscall_error); \
|
|
nop; \
|
|
ld 0,FRAME_MIN_SIZE+FRAME_LR_SAVE(1); \
|
|
addi 1,1,FRAME_MIN_SIZE; \
|
|
cfi_adjust_cfa_offset(-FRAME_MIN_SIZE); \
|
|
mtlr 0; \
|
|
cfi_restore(lr); \
|
|
blr; \
|
|
.endif
|
|
#endif
|
|
|
|
#define PSEUDO_RET \
|
|
bnslr+; \
|
|
TAIL_CALL_SYSCALL_ERROR
|
|
|
|
#define ret PSEUDO_RET
|
|
|
|
#undef PSEUDO_END
|
|
#define PSEUDO_END(name) \
|
|
END (name)
|
|
|
|
#define PSEUDO_NOERRNO(name, syscall_name, args) \
|
|
.section ".text"; \
|
|
ENTRY (name); \
|
|
DO_CALL (SYS_ify (syscall_name))
|
|
|
|
#define PSEUDO_RET_NOERRNO \
|
|
blr
|
|
|
|
#define ret_NOERRNO PSEUDO_RET_NOERRNO
|
|
|
|
#undef PSEUDO_END_NOERRNO
|
|
#define PSEUDO_END_NOERRNO(name) \
|
|
END (name)
|
|
|
|
#define PSEUDO_ERRVAL(name, syscall_name, args) \
|
|
.section ".text"; \
|
|
ENTRY (name); \
|
|
DO_CALL (SYS_ify (syscall_name))
|
|
|
|
#define PSEUDO_RET_ERRVAL \
|
|
blr
|
|
|
|
#define ret_ERRVAL PSEUDO_RET_ERRVAL
|
|
|
|
#undef PSEUDO_END_ERRVAL
|
|
#define PSEUDO_END_ERRVAL(name) \
|
|
END (name)
|
|
|
|
#else /* !__ASSEMBLER__ */
|
|
|
|
#if _CALL_ELF != 2
|
|
|
|
#define PPC64_LOAD_FUNCPTR(ptr) \
|
|
"ld 12,0(" #ptr ")\n" \
|
|
"ld 2,8(" #ptr ")\n" \
|
|
"mtctr 12\n" \
|
|
"ld 11,16(" #ptr ")"
|
|
|
|
#ifdef USE_PPC64_OVERLAPPING_OPD
|
|
# define OPD_ENT(name) ".quad " BODY_PREFIX #name ", .TOC.@tocbase"
|
|
#else
|
|
# define OPD_ENT(name) ".quad " BODY_PREFIX #name ", .TOC.@tocbase, 0"
|
|
#endif
|
|
|
|
#define ENTRY_1(name) \
|
|
".type " BODY_PREFIX #name ",@function\n" \
|
|
".globl " #name "\n" \
|
|
".pushsection \".opd\",\"aw\"\n" \
|
|
".p2align 3\n" \
|
|
#name ":\n" \
|
|
OPD_ENT (name) "\n" \
|
|
".popsection"
|
|
|
|
#define DOT_PREFIX ""
|
|
#define BODY_PREFIX ".LY"
|
|
#define ENTRY_2(name) \
|
|
".type " #name ",@function\n" \
|
|
ENTRY_1(name)
|
|
#define END_2(name) \
|
|
".size " #name ",.-" BODY_PREFIX #name "\n" \
|
|
".size " BODY_PREFIX #name ",.-" BODY_PREFIX #name
|
|
#define LOCALENTRY(name)
|
|
|
|
#else /* _CALL_ELF */
|
|
|
|
#define PPC64_LOAD_FUNCPTR(ptr) \
|
|
"mr 12," #ptr "\n" \
|
|
"mtctr 12"
|
|
|
|
#define DOT_PREFIX ""
|
|
#define BODY_PREFIX ""
|
|
#define ENTRY_2(name) \
|
|
".type " #name ",@function\n" \
|
|
".globl " #name
|
|
#define END_2(name) \
|
|
".size " #name ",.-" #name
|
|
#define LOCALENTRY(name) \
|
|
"1: addis 2,12,.TOC.-1b@ha\n" \
|
|
"addi 2,2,.TOC.-1b@l\n" \
|
|
".localentry " #name ",.-" #name
|
|
|
|
#endif /* _CALL_ELF */
|
|
|
|
#endif /* __ASSEMBLER__ */
|