On Thu, Jun 23, 2016 at 1:45 PM, H.J. Lu <hongjiu...@intel.com> wrote:
> i386 psABI has been updated to clarify that R_386_GOT32X and R_386_GOT32
> relocations can be used to access GOT without base register when PIC is
> disabled:
>
> https://groups.google.com/forum/#!topic/ia32-abi/awsRSvJOJfs
>
> 32-bit x86 assembler and linker from binutils 2.26.1 and 2.27 support
>
> call/jmp *_start@GOT
> cmpl $0, bar@GOT
>
> for both normal and IFUNC functions. We check if 32-bit x86 assembler
> and linker have the fix for:
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=20244
>
> before accessing external function via GOT slot for -fno-plt in both PIC
> and non-PIC modes.
>
> Tested on i686 and x86-64. OK for trunk?
>
>
> H.J.
> ----
> PR target/66232
> PR target/67400
> * configure.ac (HAVE_LD_IX86_GOT32X_RELOC): New. Defined to 1
> if 32-bit assembler and linker support "jmp *_start@GOT" and
> "movl $0, bar@GOT". Otherise, defined to 0.
> * config.in: Regenerated.
> * configure: Likewise.
> * config/i386/i386.c (ix86_force_load_from_GOT_p): Return
> true if HAVE_LD_IX86_GOT32X_RELOC is 1 in 32-bit mode.
> (ix86_legitimate_address_p): Allow UNSPEC_GOT for -fno-plt
> if ix86_force_load_from_GOT_p returns true.
> (ix86_print_operand_address_as): Also support UNSPEC_GOT if
> ix86_force_load_from_GOT_p returns true.
> (ix86_expand_move): Generate UNSPEC_GOT in 32-bit mode to load
> the external function address via the GOT slot.
> (ix86_nopic_noplt_attribute_p): Check HAVE_LD_IX86_GOT32X_RELOC
> == 0 before returning false in 32-bit mode.
> (ix86_output_call_insn): Generate "%!jmp/call\t*%p0@GOT" in
> 32-bit mode if ix86_nopic_noplt_attribute_p returns true.
>
> gcc/testsuite/
>
> PR target/66232
> PR target/67400
> * gcc.target/i386/pr66232-14.c: New file.
> * gcc.target/i386/pr66232-15.c: Likewise.
> * gcc.target/i386/pr66232-16.c: Likewise.
> * gcc.target/i386/pr66232-17.c: Likewise.
> * gcc.target/i386/pr67400-1.c: Don't disable for ia32. Scan for
> ia32 and if R_386_GOT32X relocation is supported.
> * gcc.target/i386/pr67400-2.c: Likewise.
> * gcc.target/i386/pr67400-3.c: Likewise.
> * gcc.target/i386/pr67400-4.c: Likewise.
> * gcc.target/i386/pr67400-6.c: Likewise.
> * gcc.target/i386/pr67400-7.c: Likewise.
> * lib/target-supports.exp (check_effective_target_got32x_reloc):
> New.
> ---
> gcc/config.in | 9 +++++-
> gcc/config/i386/i386.c | 35 ++++++++++++++++----
> gcc/configure | 50 +++++++++++++++++++++++++++++
> gcc/configure.ac | 42 ++++++++++++++++++++++++
> gcc/testsuite/gcc.target/i386/pr66232-14.c | 13 ++++++++
> gcc/testsuite/gcc.target/i386/pr66232-15.c | 14 ++++++++
> gcc/testsuite/gcc.target/i386/pr66232-16.c | 13 ++++++++
> gcc/testsuite/gcc.target/i386/pr66232-17.c | 13 ++++++++
> gcc/testsuite/gcc.target/i386/pr67400-1.c | 8 +++--
> gcc/testsuite/gcc.target/i386/pr67400-2.c | 8 +++--
> gcc/testsuite/gcc.target/i386/pr67400-3.c | 3 +-
> gcc/testsuite/gcc.target/i386/pr67400-4.c | 5 +--
> gcc/testsuite/gcc.target/i386/pr67400-6.c | 8 +++--
> gcc/testsuite/gcc.target/i386/pr67400-7.c | 6 ++--
> gcc/testsuite/lib/target-supports.exp | 51
> ++++++++++++++++++++++++++++++
> 15 files changed, 256 insertions(+), 22 deletions(-)
> create mode 100644 gcc/testsuite/gcc.target/i386/pr66232-14.c
> create mode 100644 gcc/testsuite/gcc.target/i386/pr66232-15.c
> create mode 100644 gcc/testsuite/gcc.target/i386/pr66232-16.c
> create mode 100644 gcc/testsuite/gcc.target/i386/pr66232-17.c
>
> diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
> index 9c7b015..a2dcf36 100644
> --- a/gcc/config/i386/i386.c
> +++ b/gcc/config/i386/i386.c
> @@ -15125,7 +15125,8 @@ darwin_local_data_pic (rtx disp)
> bool
> ix86_force_load_from_GOT_p (rtx x)
> {
> - return (TARGET_64BIT && !TARGET_PECOFF && !TARGET_MACHO
> + return ((TARGET_64BIT || HAVE_LD_IX86_GOT32X_RELOC)
> + && !TARGET_PECOFF && !TARGET_MACHO
> && !flag_plt && !flag_pic
> && ix86_cmodel != CM_LARGE
> && GET_CODE (x) == SYMBOL_REF
> @@ -15606,6 +15607,14 @@ ix86_legitimate_address_p (machine_mode, rtx addr,
> bool strict)
> used. While ABI specify also 32bit relocations, we don't produce
> them at all and use IP relative instead. */
> case UNSPEC_GOT:
> + gcc_assert (flag_pic
> + || ix86_force_load_from_GOT_p (XVECEXP (XEXP (disp,
> 0), 0, 0)));
> + if (!TARGET_64BIT)
> + goto is_legitimate_pic;
> +
> + /* 64bit address unspec. */
> + return false;
The above should read like:
case UNSPEC_GOT:
if (!TARGET_64BIT
&& ix86_force_load_from_GOT_p (XVECEXP (XEXP (disp, 0), 0, 0)))
goto is_legitimate_pic;
/* FALLTHRU */
case UNSPEC_GOTOFF:
gcc_assert (flag_pic);
if (!TARGET_64BIT)
goto is_legitimate_pic;
Please also update the comment above.
> case UNSPEC_GOTOFF:
> gcc_assert (flag_pic);
> if (!TARGET_64BIT)
> @@ -18194,7 +18203,8 @@ ix86_print_operand_address_as (FILE *file, rtx addr,
> /* Load the external function address via the GOT slot to avoid PLT.
> */
> else if (GET_CODE (disp) == CONST
> && GET_CODE (XEXP (disp, 0)) == UNSPEC
> - && XINT (XEXP (disp, 0), 1) == UNSPEC_GOTPCREL
> + && (XINT (XEXP (disp, 0), 1) == UNSPEC_GOTPCREL
> + || XINT (XEXP (disp, 0), 1) == UNSPEC_GOT)
> && ix86_force_load_from_GOT_p (XVECEXP (XEXP (disp, 0), 0, 0)))
> output_pic_addr_const (file, disp, 0);
> else if (flag_pic)
> @@ -19449,7 +19459,9 @@ ix86_expand_move (machine_mode mode, rtx operands[])
> {
> /* Load the external function address via GOT slot to avoid PLT. */
> op1 = gen_rtx_UNSPEC (Pmode, gen_rtvec (1, op1),
> - UNSPEC_GOTPCREL);
> + (TARGET_64BIT
> + ? UNSPEC_GOTPCREL
> + : UNSPEC_GOT));
> op1 = gen_rtx_CONST (Pmode, op1);
> op1 = gen_const_mem (Pmode, op1);
> set_mem_alias_set (op1, ix86_GOT_alias_set ());
> @@ -28027,7 +28039,8 @@ static bool
> ix86_nopic_noplt_attribute_p (rtx call_op)
> {
> if (flag_pic || ix86_cmodel == CM_LARGE
> - || !TARGET_64BIT || TARGET_MACHO || TARGET_SEH || TARGET_PECOFF
> + || (!TARGET_64BIT && HAVE_LD_IX86_GOT32X_RELOC == 0)
|| !(TARGET_64BIT || HAVE_LD_IX86_GOT32X_RELOC)
> + || TARGET_MACHO || TARGET_SEH || TARGET_PECOFF
> || SYMBOL_REF_LOCAL_P (call_op))
> return false;
>
> @@ -28055,7 +28068,12 @@ ix86_output_call_insn (rtx_insn *insn, rtx call_op)
> if (direct_p)
> {
> if (ix86_nopic_noplt_attribute_p (call_op))
> - xasm = "%!jmp\t{*%p0@GOTPCREL(%%rip)|[QWORD PTR
> %p0@GOTPCREL[rip]]}";
> + {
> + if (TARGET_64BIT)
> + xasm = "%!jmp\t{*%p0@GOTPCREL(%%rip)|[QWORD PTR
> %p0@GOTPCREL[rip]]}";
> + else
> + xasm = "%!jmp\t{*%p0@GOT|[DWORD PTR %p0@GOT]}";
> + }
> else
> xasm = "%!jmp\t%P0";
> }
> @@ -28103,7 +28121,12 @@ ix86_output_call_insn (rtx_insn *insn, rtx call_op)
> if (direct_p)
> {
> if (ix86_nopic_noplt_attribute_p (call_op))
> - xasm = "%!call\t{*%p0@GOTPCREL(%%rip)|[QWORD PTR %p0@GOTPCREL[rip]]}";
> + {
> + if (TARGET_64BIT)
> + xasm = "%!call\t{*%p0@GOTPCREL(%%rip)|[QWORD PTR
> %p0@GOTPCREL[rip]]}";
> + else
> + xasm = "%!call\t{*%p0@GOT|[DWORD PTR %p0@GOT]}";
> + }
> else
> xasm = "%!call\t%P0";
> }
> diff --git a/gcc/configure.ac b/gcc/configure.ac
> index fabd48e..2506957 100644
> --- a/gcc/configure.ac
> +++ b/gcc/configure.ac
> @@ -4200,6 +4200,48 @@ value:'
> [`if test $gcc_cv_as_ix86_tlsldm = yes; then echo 1; else echo 0; fi`],
> [Define to 1 if your assembler and linker support @tlsldm.])
>
> + AC_CACHE_CHECK([linker for R_386_GOT32X relocation],
> + [gcc_cv_ld_ix86_got32x_reloc],
> + [gcc_cv_ld_ix86_got32x_reloc=no
> + if test x$gcc_cv_as != x -a x$gcc_cv_ld != x \
> + -a x$gcc_cv_objdump != x -a x$gcc_cv_readelf != x; then
> + # Enforce 32-bit output with gas and gld.
> + if test x$gas = xyes; then
> + as_ix86_got32x_opt="--32"
> + fi
> + if echo "$ld_ver" | grep GNU > /dev/null; then
> + if $gcc_cv_ld -V 2>/dev/null | grep elf_i386_sol2 > /dev/null; then
> + ld_ix86_got32x_opt="-melf_i386_sol2"
> + else
> + ld_ix86_got32x_opt="-melf_i386"
> + fi
> + fi
> + cat > conftest.s <<EOF
> + .data
> +bar:
> + .byte 1
> + .text
> + .global _start
> +_start:
> + movl \$0, bar@GOT
> + jmp *_start@GOT
> +EOF
> + if $gcc_cv_as $as_ix86_got32x_opt -o conftest.o conftest.s >
> /dev/null 2>&1 \
> + && $gcc_cv_readelf --relocs --wide conftest.o 2>&1 \
> + | grep R_386_GOT32X > /dev/null 2>&1 \
> + && $gcc_cv_ld $ld_ix86_got32x_opt -o conftest conftest.o >
> /dev/null 2>&1; then
> + if $gcc_cv_objdump -dw conftest 2>&1 \
> + | grep 0xffffff > /dev/null 2>&1; then
> + gcc_cv_ld_ix86_got32x_reloc=no
> + else
> + gcc_cv_ld_ix86_got32x_reloc=yes
> + fi
> + fi
> + fi
> + rm -f conftest conftest.s conftest.o])
> + AC_DEFINE_UNQUOTED(HAVE_LD_IX86_GOT32X_RELOC,
> + [`if test x"$gcc_cv_ld_ix86_got32x_reloc" = xyes; then echo 1; else
> echo 0; fi`],
> + [Define 0/1 if Define if your linker supports R_386_GOT32X
> relocation.])
THe configure script already determined how to enforce 32bit output
with gas and gld, please rename and reuse as_ix86_tls_ldm_opt and
ld_ix86_tls_ldm_opt from the above check. Then define conftest_s and
call gcc_GAS_CHECK_FEATURE, as is the case with R_386_TLS_LDM reloc
check.
Also, please name this variable in a similar way, HAVE_AS_IX86_GOT32X.
Please repost v2 patch.
Uros.
> ;;
>
> ia64*-*-*)
> diff --git a/gcc/testsuite/gcc.target/i386/pr66232-14.c
> b/gcc/testsuite/gcc.target/i386/pr66232-14.c
> new file mode 100644
> index 0000000..804e5a5
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr66232-14.c
> @@ -0,0 +1,13 @@
> +/* { dg-do compile { target *-*-linux* } } */
> +/* { dg-options "-O2 -fno-pic -fno-plt" } */
> +
> +extern void bar (void);
> +
> +void
> +foo (void)
> +{
> + bar ();
> +}
> +
> +/* { dg-final { scan-assembler "jmp\[ \t\]*.bar@GOTPCREL" { target { ! ia32
> } } } } */
> +/* { dg-final { scan-assembler "jmp\[ \t\]*.bar@GOT" { target { ia32 &&
> got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr66232-15.c
> b/gcc/testsuite/gcc.target/i386/pr66232-15.c
> new file mode 100644
> index 0000000..3d2f6da
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr66232-15.c
> @@ -0,0 +1,14 @@
> +/* { dg-do compile { target *-*-linux* } } */
> +/* { dg-options "-O2 -fno-pic -fno-plt" } */
> +
> +extern void bar (void);
> +
> +int
> +foo (void)
> +{
> + bar ();
> + return 0;
> +}
> +
> +/* { dg-final { scan-assembler "call\[ \t\]*.bar@GOTPCREL" { target { ! ia32
> } } } } */
> +/* { dg-final { scan-assembler "call\[ \t\]*.bar@GOT" { target { ia32 &&
> got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr66232-16.c
> b/gcc/testsuite/gcc.target/i386/pr66232-16.c
> new file mode 100644
> index 0000000..d67f1a5
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr66232-16.c
> @@ -0,0 +1,13 @@
> +/* { dg-do compile { target *-*-linux* } } */
> +/* { dg-options "-O2 -fno-pic -fno-plt" } */
> +
> +extern int bar (void);
> +
> +int
> +foo (void)
> +{
> + return bar ();
> +}
> +
> +/* { dg-final { scan-assembler "jmp\[ \t\]*.bar@GOTPCREL" { target { ! ia32
> } } } } */
> +/* { dg-final { scan-assembler "jmp\[ \t\]*.bar@GOT" { target { ia32 &&
> got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr66232-17.c
> b/gcc/testsuite/gcc.target/i386/pr66232-17.c
> new file mode 100644
> index 0000000..bf6f375
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/pr66232-17.c
> @@ -0,0 +1,13 @@
> +/* { dg-do compile { target *-*-linux* } } */
> +/* { dg-options "-O2 -fno-pic -fno-plt" } */
> +
> +extern int bar (void);
> +
> +int
> +foo (void)
> +{
> + return bar () + 1;
> +}
> +
> +/* { dg-final { scan-assembler "call\[ \t\]*.bar@GOTPCREL" { target { ! ia32
> } } } } */
> +/* { dg-final { scan-assembler "call\[ \t\]*.bar@GOT" { target { ia32 &&
> got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr67400-1.c
> b/gcc/testsuite/gcc.target/i386/pr67400-1.c
> index 18b3790..8af6650 100644
> --- a/gcc/testsuite/gcc.target/i386/pr67400-1.c
> +++ b/gcc/testsuite/gcc.target/i386/pr67400-1.c
> @@ -1,4 +1,4 @@
> -/* { dg-do compile { target { *-*-linux* && { ! ia32 } } } } */
> +/* { dg-do compile { target *-*-linux* } } */
> /* { dg-options "-O2 -fno-pic -fno-plt" } */
>
> extern void bar (void);
> @@ -9,5 +9,7 @@ foo (void)
> return &bar;
> }
>
> -/* { dg-final { scan-assembler "mov\(l|q\)\[ \t\]*bar@GOTPCREL" } } */
> -/* { dg-final { scan-assembler-not "\(mov|lea\)\(l|q\)\[ \t\]*\(\\\$|\)bar,"
> } } */
> +/* { dg-final { scan-assembler "mov\(l|q\)\[ \t\]*bar@GOTPCREL" { target { !
> ia32 } } } } */
> +/* { dg-final { scan-assembler "movl\[ \t\]*bar@GOT," { target { ia32 &&
> got32x_reloc } } } } */
> +/* { dg-final { scan-assembler-not "\(mov|lea\)\(l|q\)\[ \t\]*\(\\\$|\)bar,"
> { target { ! ia32 } } } } */
> +/* { dg-final { scan-assembler-not "\(mov|lea\)l\[ \t\]*\(\\\$|\)bar," {
> target { ia32 && got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr67400-2.c
> b/gcc/testsuite/gcc.target/i386/pr67400-2.c
> index 8f61c3f..23dd4bf 100644
> --- a/gcc/testsuite/gcc.target/i386/pr67400-2.c
> +++ b/gcc/testsuite/gcc.target/i386/pr67400-2.c
> @@ -1,4 +1,4 @@
> -/* { dg-do compile { target { *-*-linux* && { ! ia32 } } } } */
> +/* { dg-do compile { target *-*-linux* } } */
> /* { dg-options "-O2 -fno-pic -fno-plt" } */
>
> extern void bar (void);
> @@ -10,5 +10,7 @@ foo (void)
> p = &bar;
> }
>
> -/* { dg-final { scan-assembler "mov\(l|q\)\[ \t\]*bar@GOTPCREL" } } */
> -/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*\\\$bar," } } */
> +/* { dg-final { scan-assembler "mov\(l|q\)\[ \t\]*bar@GOTPCREL" { target { !
> ia32 } } } } */
> +/* { dg-final { scan-assembler "movl\[ \t\]*bar@GOT," { target { ia32 &&
> got32x_reloc } } } } */
> +/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*\\\$bar," { target { !
> ia32 } } } } */
> +/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*\\\$bar," { target {
> ia32 && got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr67400-3.c
> b/gcc/testsuite/gcc.target/i386/pr67400-3.c
> index 40d3521..649c980 100644
> --- a/gcc/testsuite/gcc.target/i386/pr67400-3.c
> +++ b/gcc/testsuite/gcc.target/i386/pr67400-3.c
> @@ -13,4 +13,5 @@ foo (void)
> }
>
> /* { dg-final { scan-assembler "mov\(l|q\)\[ \t\]*\\\$bar," } } */
> -/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*bar@GOTPCREL" } } */
> +/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*bar@GOTPCREL" { target
> { ! ia32 } } } } */
> +/* { dg-final { scan-assembler-not "movl\[ \t\]*bar@GOT," { target { ia32 &&
> got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr67400-4.c
> b/gcc/testsuite/gcc.target/i386/pr67400-4.c
> index a329bbf..5f6883d 100644
> --- a/gcc/testsuite/gcc.target/i386/pr67400-4.c
> +++ b/gcc/testsuite/gcc.target/i386/pr67400-4.c
> @@ -1,4 +1,4 @@
> -/* { dg-do compile { target { *-*-linux* && { ! ia32 } } } } */
> +/* { dg-do compile { target *-*-linux* } } */
> /* { dg-options "-O2 -fno-pic -fno-plt" } */
>
> extern void bar (void) __attribute__ ((visibility ("hidden")));
> @@ -10,4 +10,5 @@ foo (void)
> }
>
> /* { dg-final { scan-assembler "mov\(l|q\)\[ \t\]*\\\$bar," } } */
> -/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*bar@GOTPCREL" } } */
> +/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*bar@GOTPCREL" { target
> { ! ia32 } } } } */
> +/* { dg-final { scan-assembler-not "movl\[ \t\]*bar@GOT," { target { ia32 &&
> got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr67400-6.c
> b/gcc/testsuite/gcc.target/i386/pr67400-6.c
> index bb766cd..652add4 100644
> --- a/gcc/testsuite/gcc.target/i386/pr67400-6.c
> +++ b/gcc/testsuite/gcc.target/i386/pr67400-6.c
> @@ -1,4 +1,4 @@
> -/* { dg-do compile { target { *-*-linux* && { ! ia32 } } } } */
> +/* { dg-do compile { target *-*-linux* } } */
> /* { dg-options "-O2 -fno-pic -fno-plt" } */
>
> extern int bar (void);
> @@ -9,5 +9,7 @@ check (void *p)
> return p != &bar;
> }
>
> -/* { dg-final { scan-assembler "cmp\(l|q\)\[ \t\]*.*bar@GOTPCREL" } } */
> -/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*\\\$bar," } } */
> +/* { dg-final { scan-assembler "cmp\(l|q\)\[ \t\]*.*bar@GOTPCREL" { target {
> ! ia32 } } } } */
> +/* { dg-final { scan-assembler "movl\[ \t\]*bar@GOT," { target { ia32 &&
> got32x_reloc } } } } */
> +/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*\\\$bar," { target { !
> ia32 } } } } */
> +/* { dg-final { scan-assembler-not "mov\(l|q\)\[ \t\]*\\\$bar," { target {
> ia32 && got32x_reloc } } } } */
> diff --git a/gcc/testsuite/gcc.target/i386/pr67400-7.c
> b/gcc/testsuite/gcc.target/i386/pr67400-7.c
> index 32ae85f..900e87a 100644
> --- a/gcc/testsuite/gcc.target/i386/pr67400-7.c
> +++ b/gcc/testsuite/gcc.target/i386/pr67400-7.c
> @@ -1,4 +1,4 @@
> -/* { dg-do compile { target { *-*-linux* && { ! ia32 } } } } */
> +/* { dg-do compile { target *-*-linux* } } */
> /* { dg-options "-O2 -fno-pic -fno-plt" } */
>
> extern void bar (void);
> @@ -9,5 +9,5 @@ foo (void)
> return &bar+1;
> }
>
> -/* { dg-final { scan-assembler "mov\(l|q\)\[ \t\]*bar@GOTPCREL" } } */
> -/* { dg-final { scan-assembler-not "\(mov|lea\)\(l|q\)\[ \t\]*\(\\\$|\)bar,"
> } } */
> +/* { dg-final { scan-assembler "mov\(l|q\)\[ \t\]*bar@GOTPCREL" { target { !
> ia32 } } } } */
> +/* { dg-final { scan-assembler-not "\(mov|lea\)\(l|q\)\[ \t\]*\(\\\$|\)bar,"
> { target { ! ia32 } } } } */
> diff --git a/gcc/testsuite/lib/target-supports.exp
> b/gcc/testsuite/lib/target-supports.exp
> index 1b1d03a..0b9b507 100644
> --- a/gcc/testsuite/lib/target-supports.exp
> +++ b/gcc/testsuite/lib/target-supports.exp
> @@ -6975,6 +6975,57 @@ proc check_effective_target_pie_copyreloc { } {
> return $pie_copyreloc_available_saved
> }
>
> +# Return 1 if the x86 target supports R_386_GOT32X relocation, 0
> +# otherwise. Cache the result.
> +
> +proc check_effective_target_got32x_reloc { } {
> + global got32x_reloc_available_saved
> + global tool
> + global GCC_UNDER_TEST
> +
> + if { !([istarget x86_64-*-*] || [istarget i?86-*-*]) } {
> + return 0
> + }
> +
> + # Need auto-host.h to check linker support.
> + if { ![file exists ../../auto-host.h ] } {
> + return 0
> + }
> +
> + if [info exists got32x_reloc_available_saved] {
> + verbose "check_effective_target_got32x_reloc returning saved
> $got32x_reloc_available_saved" 2
> + } else {
> + # Include the current process ID in the file names to prevent
> + # conflicts with invocations for multiple testsuites.
> +
> + set src got32x[pid].c
> + set obj got32x[pid].o
> +
> + set f [open $src "w"]
> + puts $f "#include \"../../auto-host.h\""
> + puts $f "#if HAVE_LD_IX86_GOT32X_RELOC == 0"
> + puts $f "# error Assembler does not support R_386_GOT32X."
> + puts $f "#endif"
> + close $f
> +
> + verbose "check_effective_target_got32x_reloc compiling testfile $src"
> 2
> + set lines [${tool}_target_compile $src $obj object ""]
> +
> + file delete $src
> + file delete $obj
> +
> + if [string match "" $lines] then {
> + verbose "check_effective_target_got32x_reloc testfile compilation
> passed" 2
> + set got32x_reloc_available_saved 1
> + } else {
> + verbose "check_effective_target_got32x_reloc testfile compilation
> failed" 2
> + set got32x_reloc_available_saved 0
> + }
> + }
> +
> + return $got32x_reloc_available_saved
> +}
> +
> # Return 1 if the target uses comdat groups.
>
> proc check_effective_target_comdat_group {} {
> --
> 2.5.5
>
