2017-12-27 12:51:24 +08:00
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/* RISC-V PLT trampoline
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2021-01-03 03:32:25 +08:00
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Copyright (C) 2017-2021 Free Software Foundation, Inc.
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2017-12-27 12:51:24 +08:00
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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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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 13:40:42 +08:00
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<https://www.gnu.org/licenses/>. */
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2017-12-27 12:51:24 +08:00
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#include <sysdep.h>
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#include <sys/asm.h>
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/* Assembler veneer called from the PLT header code for lazy loading.
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The PLT header passes its own args in t0-t2. */
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#ifdef __riscv_float_abi_soft
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# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
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#else
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# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
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#endif
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ENTRY (_dl_runtime_resolve)
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# Save arguments to stack.
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addi sp, sp, -FRAME_SIZE
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REG_S ra, 9*SZREG(sp)
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REG_S a0, 1*SZREG(sp)
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REG_S a1, 2*SZREG(sp)
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REG_S a2, 3*SZREG(sp)
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REG_S a3, 4*SZREG(sp)
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REG_S a4, 5*SZREG(sp)
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REG_S a5, 6*SZREG(sp)
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REG_S a6, 7*SZREG(sp)
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REG_S a7, 8*SZREG(sp)
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#ifndef __riscv_float_abi_soft
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FREG_S fa0, (10*SZREG + 0*SZFREG)(sp)
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FREG_S fa1, (10*SZREG + 1*SZFREG)(sp)
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FREG_S fa2, (10*SZREG + 2*SZFREG)(sp)
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FREG_S fa3, (10*SZREG + 3*SZFREG)(sp)
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FREG_S fa4, (10*SZREG + 4*SZFREG)(sp)
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FREG_S fa5, (10*SZREG + 5*SZFREG)(sp)
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FREG_S fa6, (10*SZREG + 6*SZFREG)(sp)
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FREG_S fa7, (10*SZREG + 7*SZFREG)(sp)
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#endif
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# Update .got.plt and obtain runtime address of callee.
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slli a1, t1, 1
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mv a0, t0 # link map
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add a1, a1, t1 # reloc offset (== thrice the .got.plt offset)
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la a2, _dl_fixup
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jalr a2
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mv t1, a0
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# Restore arguments from stack.
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REG_L ra, 9*SZREG(sp)
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REG_L a0, 1*SZREG(sp)
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REG_L a1, 2*SZREG(sp)
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REG_L a2, 3*SZREG(sp)
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REG_L a3, 4*SZREG(sp)
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REG_L a4, 5*SZREG(sp)
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REG_L a5, 6*SZREG(sp)
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REG_L a6, 7*SZREG(sp)
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REG_L a7, 8*SZREG(sp)
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#ifndef __riscv_float_abi_soft
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FREG_L fa0, (10*SZREG + 0*SZFREG)(sp)
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FREG_L fa1, (10*SZREG + 1*SZFREG)(sp)
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FREG_L fa2, (10*SZREG + 2*SZFREG)(sp)
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FREG_L fa3, (10*SZREG + 3*SZFREG)(sp)
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FREG_L fa4, (10*SZREG + 4*SZFREG)(sp)
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FREG_L fa5, (10*SZREG + 5*SZFREG)(sp)
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FREG_L fa6, (10*SZREG + 6*SZFREG)(sp)
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FREG_L fa7, (10*SZREG + 7*SZFREG)(sp)
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#endif
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addi sp, sp, FRAME_SIZE
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# Invoke the callee.
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jr t1
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END (_dl_runtime_resolve)
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