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RISC-V: Enable static-pie.

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This patch referents the commit 374cef3 to add static-pie support. And
because the dummy link map is used when relocating ourselves, so need
not to set __global_pointer$ at this time.

It will also check whether toolchain supports to build static-pie.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Yanzhang Wang 2024-01-02 18:54:15 +08:00 committed by Adhemerval Zanella
parent 061eaf0244
commit e0590f41fe
3 changed files with 77 additions and 1 deletions
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49
sysdeps/riscv/configure vendored
View File

@ -31,3 +31,52 @@ printf "%s\n" "$libc_cv_riscv_r_align" >&6; }
config_vars="$config_vars
riscv-r-align = $libc_cv_riscv_r_align"
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if the toolchain is sufficient to build static PIE on RISC-V" >&5
printf %s "checking if the toolchain is sufficient to build static PIE on RISC-V... " >&6; }
if test ${libc_cv_static_pie_on_riscv+y}
then :
printf %s "(cached) " >&6
else $as_nop
cat > conftest1.S <<\EOF
.globl _start
.type _start, @function
_start:
nop
.data
/* This should produce an R_RISCV_RELATIVE in the static PIE. */
.dword _start
EOF
libc_cv_static_pie_on_riscv=no
if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest1 conftest1.S'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } \
&& { ac_try='LC_ALL=C $READELF -Wr conftest1 | grep -q R_RISCV_RELATIVE'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; } \
&& ! { ac_try='LC_ALL=C $READELF -Wl conftest1 | grep -q INTERP'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then
libc_cv_static_pie_on_riscv=yes
fi
rm -rf conftest*
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_static_pie_on_riscv" >&5
printf "%s\n" "$libc_cv_static_pie_on_riscv" >&6; }
if test "$libc_cv_static_pie_on_riscv" = yes; then
printf "%s\n" "#define SUPPORT_STATIC_PIE 1" >>confdefs.h
fi

27
sysdeps/riscv/configure.ac
View File

@ -16,3 +16,30 @@ EOF
fi
rm -rf conftest.*])
LIBC_CONFIG_VAR([riscv-r-align], [$libc_cv_riscv_r_align])
dnl Test if the toolchain is new enough for static PIE.
AC_CACHE_CHECK([if the toolchain is sufficient to build static PIE on RISC-V],
libc_cv_static_pie_on_riscv, [
cat > conftest1.S <<\EOF
.globl _start
.type _start, @function
_start:
nop
.data
/* This should produce an R_RISCV_RELATIVE in the static PIE. */
.dword _start
EOF
libc_cv_static_pie_on_riscv=no
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static-pie -nostdlib -fPIE -o conftest1 conftest1.S]) \
&& AC_TRY_COMMAND([LC_ALL=C $READELF -Wr conftest1 | grep -q R_RISCV_RELATIVE]) \
&& ! AC_TRY_COMMAND([LC_ALL=C $READELF -Wl conftest1 | grep -q INTERP])
then
libc_cv_static_pie_on_riscv=yes
fi
rm -rf conftest* ])
if test "$libc_cv_static_pie_on_riscv" = yes; then
AC_DEFINE(SUPPORT_STATIC_PIE)
fi

2
sysdeps/riscv/dl-machine.h
View File

@ -348,7 +348,7 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
gotplt[1] = (ElfW(Addr)) l;
}
if (l->l_type == lt_executable)
if (l->l_type == lt_executable && l->l_scope != NULL)
{
/* The __global_pointer$ may not be defined by the linker if the
$gp register does not be used to access the global variable