2003-01-17 01:02:24 +00:00
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/* Create new context.
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2019-01-01 00:11:28 +00:00
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Copyright (C) 2002-2019 Free Software Foundation, Inc.
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2003-01-17 01:02:24 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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2012-02-09 23:18:22 +00:00
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License along with the GNU C Library; if not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2003-01-17 01:02:24 +00:00
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#include <sysdep.h>
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#define __ASSEMBLY__
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#include <asm/ptrace.h>
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#include "ucontext_i.h"
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2003-02-01 20:53:16 +00:00
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#include <asm/errno.h>
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2003-01-17 01:02:24 +00:00
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PowerPC64 FRAME_PARM_SAVE
I think FRAME_PARM[1-9]_SAVE confuse the code, particularly
FRAME_PARM9_SAVE. There are only 8 parameter save slots!
* sysdeps/powerpc/powerpc64/sysdep.h: (FRAME_BACKCHAIN,
FRAME_CR_SAVE, FRAME_LR_SAVE): Move out of conditional.
(FRAME_PARM1_SAVE, FRAME_PARM2_SAVE, FRAME_PARM3_SAVE,
FRAME_PARM4_SAVE, FRAME_PARM5_SAVE, FRAME_PARM6_SAVE,
FRAME_PARM7_SAVE, FRAME_PARM8_SAVE, FRAME_PARM9_SAVE): Delete.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: Replace
uses of FRAME_PARM[1-9]_SAVE with FRAME_PARM_SAVE plus offset.
2017-06-14 01:13:33 +00:00
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ENTRY (__makecontext)
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2004-12-14 21:25:41 +00:00
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CALL_MCOUNT 3
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2003-01-17 01:02:24 +00:00
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/* Save parameters into the parameter save area of callers frame. */
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PowerPC64 FRAME_PARM_SAVE
I think FRAME_PARM[1-9]_SAVE confuse the code, particularly
FRAME_PARM9_SAVE. There are only 8 parameter save slots!
* sysdeps/powerpc/powerpc64/sysdep.h: (FRAME_BACKCHAIN,
FRAME_CR_SAVE, FRAME_LR_SAVE): Move out of conditional.
(FRAME_PARM1_SAVE, FRAME_PARM2_SAVE, FRAME_PARM3_SAVE,
FRAME_PARM4_SAVE, FRAME_PARM5_SAVE, FRAME_PARM6_SAVE,
FRAME_PARM7_SAVE, FRAME_PARM8_SAVE, FRAME_PARM9_SAVE): Delete.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: Replace
uses of FRAME_PARM[1-9]_SAVE with FRAME_PARM_SAVE plus offset.
2017-06-14 01:13:33 +00:00
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std r3,FRAME_PARM_SAVE+0(r1) /* ucontext_t *ucp */
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std r4,FRAME_PARM_SAVE+8(r1) /* void (*func)(void) */
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std r5,FRAME_PARM_SAVE+16(r1) /* int argc */
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std r6,FRAME_PARM_SAVE+24(r1) /* ... */
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std r7,FRAME_PARM_SAVE+32(r1)
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std r8,FRAME_PARM_SAVE+40(r1)
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std r9,FRAME_PARM_SAVE+48(r1)
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std r10,FRAME_PARM_SAVE+56(r1)
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2003-01-17 01:02:24 +00:00
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mflr r0
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/* Get the address of the target functions first parameter. */
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PowerPC64 FRAME_PARM_SAVE
I think FRAME_PARM[1-9]_SAVE confuse the code, particularly
FRAME_PARM9_SAVE. There are only 8 parameter save slots!
* sysdeps/powerpc/powerpc64/sysdep.h: (FRAME_BACKCHAIN,
FRAME_CR_SAVE, FRAME_LR_SAVE): Move out of conditional.
(FRAME_PARM1_SAVE, FRAME_PARM2_SAVE, FRAME_PARM3_SAVE,
FRAME_PARM4_SAVE, FRAME_PARM5_SAVE, FRAME_PARM6_SAVE,
FRAME_PARM7_SAVE, FRAME_PARM8_SAVE, FRAME_PARM9_SAVE): Delete.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: Replace
uses of FRAME_PARM[1-9]_SAVE with FRAME_PARM_SAVE plus offset.
2017-06-14 01:13:33 +00:00
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addi r6,r1,FRAME_PARM_SAVE+24
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2003-01-17 01:02:24 +00:00
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std r0,FRAME_LR_SAVE(r1)
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2006-01-07 03:58:05 +00:00
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cfi_offset (lr, FRAME_LR_SAVE)
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2003-01-17 01:02:24 +00:00
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stdu r1,-128(r1)
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2006-01-07 03:58:05 +00:00
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cfi_adjust_cfa_offset (128)
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2004-04-01 21:17:57 +00:00
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2003-01-17 01:02:24 +00:00
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/* Get the ucontexts stack pointer and size. Compute the top of stack
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2004-04-01 21:17:57 +00:00
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and round down to a quadword boundary. Then stack a dummy frame
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2003-01-17 01:02:24 +00:00
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with a null back chain. We store the context pointer in the frames
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2004-04-01 21:17:57 +00:00
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"compiler double word" field so we can recover if is the function
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returns. Finally save the callers link register and TOC pointer
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2003-01-17 01:02:24 +00:00
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into this frame so the debugger can display a backtrace.
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*/
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ld r7,UCONTEXT_STACK_SP(r3)
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ld r0,UCONTEXT_STACK_SIZE(r3)
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add r7,r7,r0
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clrrdi r7,r7,4
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li r0,0
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Update.
2004-01-14 Steven Munroe <sjmunroe@us.ibm.com>
* include/libc-symbols.h [HAVE_ASM_GLOBAL_DOT_NAME]
(_symbol_version): Use C_SYMBOL_DOT_NAME to create '.'ed symbols.
(_default_symbol_version): Use C_SYMBOL_DOT_NAME to create '.'ed
symbols.
* sysdeps/powerpc/Makefile: Add rtld-global-offsets.sym to
gen-as-const-headers.
* sysdeps/powerpc/elf/rtld-global-offsets.sym: New file.
* sysdeps/powerpc/sysdep.h: Define v# symbols for vector registers.
Define PPC_FEATURE_* masks for Aux Vector AT_HWCAP.
* sysdeps/unix/sysv/linux/kernel-features.h
(__ASSUME_SWAPCONTEXT_SYSCALL): Define for PPC and 2.6.0 kernels.
* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h [!__WORDSIZE == 32]:
Declare mcontext_t inline and include altivec state for 64-bit.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions: Add GLIBC_2.3.4
versions for setcontext, getcontext, and swapcontext.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/Versions: Add GLIBC_2.3.4
versions for setcontext, getcontext, swapcontext, and makecontext.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/getcontext.S
(__getcontext): Upgrade to save Altivec regs and version GLIBC_2_3_4.
[SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_3_4)](__novec_getcontext):
Compatible with GLIBC_2.3.3 release.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S
(__makecontext): Use parm save area instead of compiler_dw to hold
context pointer.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S
(__setcontext): Upgrade to restore Altivec regs and version
GLIBC_2_3_4.
[SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_3_4)](__novec_setcontext):
Compatible with GLIBC_2.3.3 release.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S
(__swapcontext): Upgrade to swap Altivec regs and version GLIBC_2_3_4.
[SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_3_4)](__novec_swapcontext):
Compatible with GLIBC_2.3.3 release.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/ucontext_i.h
(SIGCONTEXT_V_REGS_PTR, SIGCONTEXT_V_RESERVE): Defined.
2004-01-12 Steven Munroe <sjmunroe@us.ibm.com>
* sysdeps/unix/sysv/linux/powerpc/powerpc32/Versions: Add GLIBC_2.3.4
versions for setcontext, getcontext, swapcontext, and makecontext.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/getcontext.S
(__getcontext): Upgrade to save Altivec regs and version GLIBC_2_3_4.
[SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)](__novec_getcontext):
Compatible with GLIBC_2.3.3 release.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/makecontext.S
(__makecontext): Upgrade to align for Altivec regs and version
GLIBC_2_3_4.
[SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)](__novec_makecontext):
Compatible with GLIBC_2.3.3 release.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext.S
(__setcontext): Upgrade to restore Altivec regs and version
GLIBC_2_3_4.
[SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)](__novec_setcontext):
Compatible with GLIBC_2.3.3 release.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext.S
(__swapcontext): Upgrade to swap Altivec regs and version GLIBC_2_3_4.
[SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)]
(__novec_swapcontext): Compatible with GLIBC_2.3.3 release.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/ucontext_i.h:
(_UC_VSCR, _UC_VRSAVE): Define.
(_FRAME_BACKCHAIN, _FRAME_LR_SAVE,_FRAME_PARM_SAVE1,_FRAME_PARM_SAVE2,
_FRAME_PARM_SAVE3, _FRAME_PARM_SAVE4): Defined.
2004-01-16 04:50:59 +00:00
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stdu r0,-64(r7)
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PowerPC64 FRAME_PARM_SAVE
I think FRAME_PARM[1-9]_SAVE confuse the code, particularly
FRAME_PARM9_SAVE. There are only 8 parameter save slots!
* sysdeps/powerpc/powerpc64/sysdep.h: (FRAME_BACKCHAIN,
FRAME_CR_SAVE, FRAME_LR_SAVE): Move out of conditional.
(FRAME_PARM1_SAVE, FRAME_PARM2_SAVE, FRAME_PARM3_SAVE,
FRAME_PARM4_SAVE, FRAME_PARM5_SAVE, FRAME_PARM6_SAVE,
FRAME_PARM7_SAVE, FRAME_PARM8_SAVE, FRAME_PARM9_SAVE): Delete.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: Replace
uses of FRAME_PARM[1-9]_SAVE with FRAME_PARM_SAVE plus offset.
2017-06-14 01:13:33 +00:00
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std r3,FRAME_PARM_SAVE(r7) /* Store context in dummy parm1. */
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2003-01-17 01:02:24 +00:00
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mflr r0
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std r2,FRAME_TOC_SAVE(r7) /* Store the TOC pointer for later. */
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std r0,FRAME_LR_SAVE(r7)
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2004-04-01 21:17:57 +00:00
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2003-01-17 01:02:24 +00:00
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/* Now we need to stack another frame to hold the parameter save area
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2004-04-01 21:17:57 +00:00
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for the function. We need to allocate a frame with the minimum 48
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byte header and 8 parameter register. However if there are more
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2003-01-17 01:02:24 +00:00
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than 8 parameters addition space is need to hold all the parameters.
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2004-04-01 21:17:57 +00:00
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The total size it rounded up to a quadword multiple then a frame is
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2003-01-17 01:02:24 +00:00
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stacked. This address is stored in the ucontext as GPR 1. */
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2004-04-01 21:17:57 +00:00
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cmpdi cr1,r5,8
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2003-01-17 01:02:24 +00:00
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sldi r8,r5,3
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bgt cr1,L(gt8)
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li r8,64
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L(gt8):
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addi r8,r8,FRAME_PARM_SAVE+8 /* Add header plus rounding factor. */
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clrrdi r8,r8,4 /* Round down to quadword. */
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2004-04-01 21:17:57 +00:00
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2003-01-17 01:02:24 +00:00
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subf r8,r8,r7
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std r7,0(r8) /* Stack the frame. */
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std r8,(SIGCONTEXT_GP_REGS+(PT_R1*8))(r3)
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2004-04-01 21:17:57 +00:00
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/* Now we need to copy the target functions parameters. The functions
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2003-01-17 01:02:24 +00:00
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parameters are saved in the parameter save area. We skip over the
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2004-04-01 21:17:57 +00:00
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first three parameters and copy up to 8 double word into the
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SIGCONTEXT_GP_REGS starting with R3. If there are more than 8
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2003-01-17 01:02:24 +00:00
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parameters then doublewords 8-N are copied into the parameter
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2004-04-01 21:17:57 +00:00
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save area of the context frame. */
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2003-01-17 01:02:24 +00:00
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cmpdi r5,0
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beq L(noparms)
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mr r0,r5
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ble cr1,L(le8)
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li r0,8
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2004-04-01 21:17:57 +00:00
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L(le8):
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2003-01-17 01:02:24 +00:00
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mtctr r0
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addi r7,r6,-8
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addi r9,r3,(SIGCONTEXT_GP_REGS+(PT_R3*8)-8)
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L(parmloop2):
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ldu r0,8(r7)
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stdu r0,8(r9)
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bdnz L(parmloop2)
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2004-04-01 21:17:57 +00:00
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addi r0,r5,-8
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ble cr1,L(noparms)
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2003-01-17 01:02:24 +00:00
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mtctr r0
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PowerPC64 FRAME_PARM_SAVE
I think FRAME_PARM[1-9]_SAVE confuse the code, particularly
FRAME_PARM9_SAVE. There are only 8 parameter save slots!
* sysdeps/powerpc/powerpc64/sysdep.h: (FRAME_BACKCHAIN,
FRAME_CR_SAVE, FRAME_LR_SAVE): Move out of conditional.
(FRAME_PARM1_SAVE, FRAME_PARM2_SAVE, FRAME_PARM3_SAVE,
FRAME_PARM4_SAVE, FRAME_PARM5_SAVE, FRAME_PARM6_SAVE,
FRAME_PARM7_SAVE, FRAME_PARM8_SAVE, FRAME_PARM9_SAVE): Delete.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: Replace
uses of FRAME_PARM[1-9]_SAVE with FRAME_PARM_SAVE plus offset.
2017-06-14 01:13:33 +00:00
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addi r9,r8,FRAME_PARM_SAVE+64-8
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2003-01-17 01:02:24 +00:00
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L(parmloop):
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ldu r0,8(r7)
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stdu r0,8(r9)
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bdnz L(parmloop)
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2004-04-01 21:17:57 +00:00
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2003-01-17 01:02:24 +00:00
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L(noparms):
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2004-04-01 21:17:57 +00:00
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2013-12-04 12:51:11 +00:00
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#if _CALL_ELF != 2
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2003-01-17 01:02:24 +00:00
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/* Load the function address and TOC from the function descriptor
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2004-04-01 21:17:57 +00:00
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and store them in the ucontext as NIP and r2. Store the 3rd
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2003-01-17 01:02:24 +00:00
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field of the function descriptor into the ucontext as r11 in case
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the calling language needs the "environment pointer". */
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ld r0,0(r4)
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ld r10,8(r4);
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2004-04-01 21:17:57 +00:00
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ld r9,16(r4);
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std r0,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3)
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std r10,(SIGCONTEXT_GP_REGS+(PT_R2*8))(r3)
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2003-01-17 01:02:24 +00:00
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std r9,(SIGCONTEXT_GP_REGS+(PT_R11*8))(r3)
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2013-12-04 12:51:11 +00:00
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#else
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/* In the ELFv2 ABI, the function pointer is already the address.
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Store it as NIP and r12 as required by the ABI. */
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std r4,(SIGCONTEXT_GP_REGS+(PT_NIP*8))(r3)
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std r4,(SIGCONTEXT_GP_REGS+(PT_R12*8))(r3)
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#endif
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2004-04-01 21:17:57 +00:00
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2003-01-17 01:02:24 +00:00
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/* If the target function returns we need to do some cleanup. We use a
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code trick to get the address of our cleanup function into the link
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2013-08-17 09:06:45 +00:00
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register. Do not add any code between here and L(exitcode).
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Use this conditional form of branch and link to avoid destroying
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the cpu link stack used to predict blr return addresses. */
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bcl 20,31,L(gotexitcodeaddr);
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2003-01-17 01:02:24 +00:00
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2013-12-04 12:41:52 +00:00
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/* End FDE now, because while executing on the context's stack
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the unwind info would be wrong otherwise. */
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cfi_endproc
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2003-01-17 01:02:24 +00:00
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/* This is the helper code which gets called if a function which
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is registered with 'makecontext' returns. In this case we
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have to install the context listed in the uc_link element of
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the context 'makecontext' manipulated at the time of the
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'makecontext' call. If the pointer is NULL the process must
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terminate. */
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L(exitcode):
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2012-11-02 01:10:39 +00:00
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/* Recover the ucontext and TOC from the dummy frame. */
|
|
|
|
ld r1,FRAME_BACKCHAIN(r1) /* Unstack the parameter save area frame. */
|
PowerPC64 FRAME_PARM_SAVE
I think FRAME_PARM[1-9]_SAVE confuse the code, particularly
FRAME_PARM9_SAVE. There are only 8 parameter save slots!
* sysdeps/powerpc/powerpc64/sysdep.h: (FRAME_BACKCHAIN,
FRAME_CR_SAVE, FRAME_LR_SAVE): Move out of conditional.
(FRAME_PARM1_SAVE, FRAME_PARM2_SAVE, FRAME_PARM3_SAVE,
FRAME_PARM4_SAVE, FRAME_PARM5_SAVE, FRAME_PARM6_SAVE,
FRAME_PARM7_SAVE, FRAME_PARM8_SAVE, FRAME_PARM9_SAVE): Delete.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: Replace
uses of FRAME_PARM[1-9]_SAVE with FRAME_PARM_SAVE plus offset.
2017-06-14 01:13:33 +00:00
|
|
|
ld r3,FRAME_PARM_SAVE(r1)
|
2012-11-02 01:10:39 +00:00
|
|
|
ld r2,FRAME_TOC_SAVE(r1)
|
|
|
|
ld r3,UCONTEXT_LINK(r3) /* Load the resume context. */
|
|
|
|
cmpdi r3,0
|
|
|
|
beq L(do_exit)
|
2003-01-17 01:02:24 +00:00
|
|
|
bl JUMPTARGET(__setcontext)
|
|
|
|
nop
|
2012-11-02 01:10:39 +00:00
|
|
|
/* If setcontext returns (which can happen if the syscall fails) we will
|
|
|
|
exit the program with error status (-1). */
|
|
|
|
li r3,-1
|
|
|
|
L(do_exit):
|
2004-04-01 21:17:57 +00:00
|
|
|
#ifdef SHARED
|
2012-11-02 01:10:39 +00:00
|
|
|
b JUMPTARGET(__GI_exit);
|
2004-04-01 21:17:57 +00:00
|
|
|
#else
|
2012-11-02 01:10:39 +00:00
|
|
|
b JUMPTARGET(exit);
|
|
|
|
nop
|
2004-04-01 21:17:57 +00:00
|
|
|
#endif
|
2012-11-02 01:10:39 +00:00
|
|
|
b L(do_exit)
|
2004-04-01 21:17:57 +00:00
|
|
|
|
2013-12-04 12:41:52 +00:00
|
|
|
/* Re-establish FDE for the rest of the actual makecontext routine. */
|
|
|
|
cfi_startproc
|
|
|
|
cfi_offset (lr, FRAME_LR_SAVE)
|
|
|
|
cfi_adjust_cfa_offset (128)
|
|
|
|
|
2003-01-17 01:02:24 +00:00
|
|
|
/* The address of the exit code is in the link register. Store the lr
|
2004-04-01 21:17:57 +00:00
|
|
|
in the ucontext as LNK so the target function will return to our
|
2003-01-17 01:02:24 +00:00
|
|
|
exit code. */
|
|
|
|
L(gotexitcodeaddr):
|
|
|
|
mflr r0
|
|
|
|
std r0,(SIGCONTEXT_GP_REGS+(PT_LNK*8))(r3)
|
2004-04-01 21:17:57 +00:00
|
|
|
ld r0,128+FRAME_LR_SAVE(r1)
|
2003-01-17 01:02:24 +00:00
|
|
|
addi r1,r1,128
|
|
|
|
mtlr r0
|
|
|
|
blr
|
|
|
|
END(__makecontext)
|
|
|
|
|
2005-05-26 14:30:51 +00:00
|
|
|
weak_alias (__makecontext, makecontext)
|