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S390: Save and restore fprs/vrs while resolving symbols.

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On s390, no fpr/vrs were saved while resolving a symbol
via _dl_runtime_resolve/_dl_runtime_profile.

According to the abi, the fpr-arguments are defined as call clobbered.
In leaf-functions, gcc 4.9 and newer can use fprs for saving/restoring gprs
instead of saving them to the stack.
If gcc do this in one of the resolver-functions, then the floating point
arguments of a library-function are invalid for the first library-function-call.
Thus, this patch saves/restores the fprs around the resolving code.

The same could occur for vector registers. Furthermore an ifunc-resolver
could also clobber the vector/floating point argument registers.
Thus this patch provides the further variants _dl_runtime_resolve_vx/
_dl_runtime_profile_vx, which are used if the kernel claims, that
we run on a machine with vector registers.

Furthermore, if _dl_runtime_profile calls _dl_call_pltexit,
the pointers to inregs-/outregs-structs were setup invalid.
Now they point to the correct location in the stack-frame.
Before branching back to the caller, the return values are now
restored instead of containing the return values of the
_dl_call_pltexit() call.
On s390-32, an endless loop occurs if _dl_call_pltexit() should be called.
Now, this code-path branches to this function instead of just after the
preceding basr-instruction.

ChangeLog:

	* sysdeps/s390/s390-32/dl-trampoline.S: Include dl-trampoline.h twice
	to create a non-vector/vector version for _dl_runtime_resolve and
	_dl_runtime_profile. Move implementation to ...
	* sysdeps/s390/s390-32/dl-trampoline.h: ... here.
	(_dl_runtime_resolve) Save and restore fpr/vrs.
	(_dl_runtime_profile) Save and restore vrs and fix some issues
	if _dl_call_pltexit is called.
	* sysdeps/s390/s390-32/dl-machine.h (elf_machine_runtime_setup):
	Choose the correct resolver function if running on a machine with vx.
	* sysdeps/s390/s390-64/dl-trampoline.S: Include dl-trampoline.h twice
	to create a non-vector/vector version for _dl_runtime_resolve and
	_dl_runtime_profile. Move implementation to ...
	* sysdeps/s390/s390-64/dl-trampoline.h: ... here.
	(_dl_runtime_resolve) Save and restore fpr/vrs.
	(_dl_runtime_profile) Save and restore vrs and fix some issues
	* sysdeps/s390/s390-64/dl-machine.h: (elf_machine_runtime_setup):
	Choose the correct resolver function if running on a machine with vx.
This commit is contained in:
Stefan Liebler 2016-03-31 17:37:16 +02:00
parent e91bd74658
commit 4603c51ef7
7 changed files with 514 additions and 246 deletions
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20
ChangeLog
View File

@ -1,3 +1,23 @@
2016-03-31 Stefan Liebler <stli@linux.vnet.ibm.com>
* sysdeps/s390/s390-32/dl-trampoline.S: Include dl-trampoline.h twice
to create a non-vector/vector version for _dl_runtime_resolve and
_dl_runtime_profile. Move implementation to ...
* sysdeps/s390/s390-32/dl-trampoline.h: ... here.
(_dl_runtime_resolve) Save and restore fpr/vrs.
(_dl_runtime_profile) Save and restore vrs and fix some issues
if _dl_call_pltexit is called.
* sysdeps/s390/s390-32/dl-machine.h (elf_machine_runtime_setup):
Choose the correct resolver function if running on a machine with vx.
* sysdeps/s390/s390-64/dl-trampoline.S: Include dl-trampoline.h twice
to create a non-vector/vector version for _dl_runtime_resolve and
_dl_runtime_profile. Move implementation to ...
* sysdeps/s390/s390-64/dl-trampoline.h: ... here.
(_dl_runtime_resolve) Save and restore fpr/vrs.
(_dl_runtime_profile) Save and restore vrs and fix some issues
* sysdeps/s390/s390-64/dl-machine.h: (elf_machine_runtime_setup):
Choose the correct resolver function if running on a machine with vx.
2016-03-31 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* elf/tst-dlsym-error.c: Include <string.h> for strchrnul.

27
sysdeps/s390/s390-32/dl-machine.h
View File

@ -89,6 +89,11 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
{
extern void _dl_runtime_resolve (Elf32_Word);
extern void _dl_runtime_profile (Elf32_Word);
#if defined HAVE_S390_VX_ASM_SUPPORT
extern void _dl_runtime_resolve_vx (Elf32_Word);
extern void _dl_runtime_profile_vx (Elf32_Word);
#endif
if (l->l_info[DT_JMPREL] && lazy)
{
@ -116,7 +121,14 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
end in this function. */
if (__glibc_unlikely (profile))
{
#if defined HAVE_S390_VX_ASM_SUPPORT
if (GLRO(dl_hwcap) & HWCAP_S390_VX)
got[2] = (Elf32_Addr) &_dl_runtime_profile_vx;
else
got[2] = (Elf32_Addr) &_dl_runtime_profile;
#else
got[2] = (Elf32_Addr) &_dl_runtime_profile;
#endif
if (GLRO(dl_profile) != NULL
&& _dl_name_match_p (GLRO(dl_profile), l))
@ -125,9 +137,18 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
GL(dl_profile_map) = l;
}
else
/* This function will get called to fix up the GOT entry indicated by
the offset on the stack, and then jump to the resolved address. */
got[2] = (Elf32_Addr) &_dl_runtime_resolve;
{
/* This function will get called to fix up the GOT entry indicated by
the offset on the stack, and then jump to the resolved address. */
#if defined HAVE_S390_VX_ASM_SUPPORT
if (GLRO(dl_hwcap) & HWCAP_S390_VX)
got[2] = (Elf32_Addr) &_dl_runtime_resolve_vx;
else
got[2] = (Elf32_Addr) &_dl_runtime_resolve;
#else
got[2] = (Elf32_Addr) &_dl_runtime_resolve;
#endif
}
}
return lazy;

132
sysdeps/s390/s390-32/dl-trampoline.S
View File

@ -16,130 +16,18 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* This code is used in dl-runtime.c to call the `fixup' function
and then redirect to the address it returns. */
/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
* with the following linkage:
* r2 - r6 : parameter registers
* f0, f2 : floating point parameter registers
* 24(r15), 28(r15) : PLT arguments PLT1, PLT2
* 96(r15) : additional stack parameters
* The normal clobber rules for function calls apply:
* r0 - r5 : call clobbered
* r6 - r13 : call saved
* r14 : return address (call clobbered)
* r15 : stack pointer (call saved)
* f4, f6 : call saved
* f0 - f3, f5, f7 - f15 : call clobbered
*/
#include <sysdep.h>
.text
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
cfi_startproc
.align 16
_dl_runtime_resolve:
stm %r2,%r5,32(%r15) # save registers
st %r14,8(%r15)
cfi_offset (r14, -88)
lr %r0,%r15 # create stack frame
ahi %r15,-96
cfi_adjust_cfa_offset (96)
st 0,0(%r15)
lm %r2,%r3,120(%r15) # load args saved by PLT
basr %r1,0
0: l %r14,1f-0b(%r1)
bas %r14,0(%r14,%r1) # call resolver
lr %r1,%r2 # function addr returned in r2
ahi %r15,96 # remove stack frame
cfi_adjust_cfa_offset (-96)
l %r14,8(15) # restore registers
lm %r2,%r5,32(%r15)
br %r1
1: .long _dl_fixup - 0b
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
/* Create variant of _dl_runtime_resolve/profile for machines before z13.
No vector registers are saved/restored. */
#include <dl-trampoline.h>
#ifndef PROF
.globl _dl_runtime_profile
.type _dl_runtime_profile, @function
cfi_startproc
.align 16
_dl_runtime_profile:
stm %r2,%r6,32(%r15) # save registers
std %f0,56(%r15)
std %f2,64(%r15)
st %r6,8(%r15)
st %r12,12(%r15)
st %r14,16(%r15)
cfi_offset (r6, -64)
cfi_offset (f0, -40)
cfi_offset (f2, -32)
cfi_offset (r12, -84)
cfi_offset (r14, -80)
lr %r12,%r15 # create stack frame
cfi_def_cfa_register (12)
ahi %r15,-96
st %r12,0(%r15)
lm %r2,%r3,24(%r12) # load arguments saved by PLT
lr %r4,%r14 # return address as third parameter
basr %r1,0
0: l %r14,6f-0b(%r1)
la %r5,32(%r12) # pointer to struct La_s390_32_regs
la %r6,20(%r12) # long int * framesize
bas %r14,0(%r14,%r1) # call resolver
lr %r1,%r2 # function addr returned in r2
icm %r0,15,20(%r12) # load & test framesize
jnm 2f
lm %r2,%r6,32(%r12)
ld %f0,56(%r12)
ld %f2,64(%r12)
lr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
l %r14,16(%r15) # restore registers
l %r12,12(%r15)
br %r1 # tail-call to the resolved function
cfi_def_cfa_register (12)
2: jz 4f # framesize == 0 ?
ahi %r0,7 # align framesize to 8
lhi %r2,-8
nr %r0,%r2
slr %r15,%r0 # make room for framesize bytes
st %r12,0(%r15)
la %r2,96(%r15)
la %r3,96(%r12)
srl %r0,3
3: mvc 0(8,%r2),0(%r3) # copy additional parameters
la %r2,8(%r2)
la %r3,8(%r3)
brct %r0,3b
4: lm %r2,%r6,32(%r12) # load register parameters
ld %f0,56(%r12)
ld %f2,64(%r12)
basr %r14,%r1 # call resolved function
stm %r2,%r3,72(%r12)
std %f0,80(%r12)
lm %r2,%r3,24(%r12) # load arguments saved by PLT
basr %r1,0
5: l %r14,7f-5b(%r1)
la %r4,32(%r12) # pointer to struct La_s390_32_regs
la %r5,72(%r12) # pointer to struct La_s390_32_retval
basr %r14,%r1 # call _dl_call_pltexit
lr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
l %r14,16(%r15) # restore registers
l %r12,12(%r15)
br %r14
6: .long _dl_profile_fixup - 0b
7: .long _dl_call_pltexit - 5b
cfi_endproc
.size _dl_runtime_profile, .-_dl_runtime_profile
#if defined HAVE_S390_VX_ASM_SUPPORT
/* Create variant of _dl_runtime_resolve/profile for z13 and newer.
The vector registers are saved/restored, too.*/
# define _dl_runtime_resolve _dl_runtime_resolve_vx
# define _dl_runtime_profile _dl_runtime_profile_vx
# define RESTORE_VRS
# include <dl-trampoline.h>
#endif

215
sysdeps/s390/s390-32/dl-trampoline.h Normal file
View File

@ -0,0 +1,215 @@
/* PLT trampolines. s390 version.
Copyright (C) 2016 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/>. */
/* This code is used in dl-runtime.c to call the `fixup' function
and then redirect to the address it returns. */
/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
* with the following linkage:
* r2 - r6 : parameter registers
* f0, f2 : floating point parameter registers
* v24, v26, v28, v30, v25, v27, v29, v31 : vector parameter registers
* 24(r15), 28(r15) : PLT arguments PLT1, PLT2
* 96(r15) : additional stack parameters
* The normal clobber rules for function calls apply:
* r0 - r5 : call clobbered
* r6 - r13 : call saved
* r14 : return address (call clobbered)
* r15 : stack pointer (call saved)
* f4, f6 : call saved
* f0 - f3, f5, f7 - f15 : call clobbered
* v0 - v3, v5, v7 - v15 : bytes 0-7 overlap with fprs: call clobbered
bytes 8-15: call clobbered
* v4, v6 : bytes 0-7 overlap with f4, f6: call saved
bytes 8-15: call clobbered
* v16 - v31 : call clobbered
*/
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
cfi_startproc
.align 16
_dl_runtime_resolve:
stm %r2,%r5,32(%r15) # save registers
cfi_offset (r2, -64)
cfi_offset (r3, -60)
cfi_offset (r4, -56)
cfi_offset (r5, -52)
std %f0,56(%r15)
cfi_offset (f0, -40)
std %f2,64(%r15)
cfi_offset (f2, -32)
st %r14,8(%r15)
cfi_offset (r14, -88)
lr %r0,%r15
lm %r2,%r3,24(%r15) # load args saved by PLT
#ifdef RESTORE_VRS
ahi %r15,-224 # create stack frame
cfi_adjust_cfa_offset (224)
.machine push
.machine "z13"
.machinemode "zarch_nohighgprs"
vstm %v24,%v31,96(%r15) # store call-clobbered vr arguments
cfi_offset (v24, -224)
cfi_offset (v25, -208)
cfi_offset (v26, -192)
cfi_offset (v27, -176)
cfi_offset (v28, -160)
cfi_offset (v29, -144)
cfi_offset (v30, -128)
cfi_offset (v31, -112)
.machine pop
#else
ahi %r15,-96 # create stack frame
cfi_adjust_cfa_offset (96)
#endif
st %r0,0(%r15) # write backchain
basr %r1,0
0: l %r14,1f-0b(%r1)
bas %r14,0(%r14,%r1) # call _dl_fixup
lr %r1,%r2 # function addr returned in r2
#ifdef RESTORE_VRS
.machine push
.machine "z13"
.machinemode "zarch_nohighgprs"
vlm %v24,%v31,96(%r15) # restore vector registers
.machine pop
aghi %r15,224 # remove stack frame
cfi_adjust_cfa_offset (-224)
#else
ahi %r15,96 # remove stack frame
cfi_adjust_cfa_offset (-96)
#endif
l %r14,8(15) # restore registers
ld %f0,56(%r15)
ld %f2,64(%r15)
lm %r2,%r5,32(%r15)
br %r1
1: .long _dl_fixup - 0b
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
#ifndef PROF
.globl _dl_runtime_profile
.type _dl_runtime_profile, @function
cfi_startproc
.align 16
_dl_runtime_profile:
stm %r2,%r6,32(%r15) # save registers
cfi_offset (r2, -64) # + r6 needed as arg for
cfi_offset (r3, -60) # _dl_profile_fixup
cfi_offset (r4, -56)
cfi_offset (r5, -52)
cfi_offset (r6, -48)
std %f0,56(%r15)
cfi_offset (f0, -40)
std %f2,64(%r15)
cfi_offset (f2, -32)
st %r12,12(%r15) # r12 is used as backup of r15
cfi_offset (r12, -84)
st %r14,16(%r15)
cfi_offset (r14, -80)
lr %r12,%r15 # backup stack pointer
cfi_def_cfa_register (12)
#ifdef RESTORE_VRS
ahi %r15,-224 # create stack frame
.machine push
.machine "z13"
.machinemode "zarch_nohighgprs"
vstm %v24,%v31,96(%r15) # store call-clobbered vr arguments
cfi_offset (v24, -224)
cfi_offset (v25, -208)
cfi_offset (v26, -192)
cfi_offset (v27, -176)
cfi_offset (v28, -160)
cfi_offset (v29, -144)
cfi_offset (v30, -128)
cfi_offset (v31, -112)
.machine pop
#else
ahi %r15,-96 # create stack frame
#endif
st %r12,0(%r15) # save backchain
lm %r2,%r3,24(%r12) # load arguments saved by PLT
lr %r4,%r14 # return address as third parameter
basr %r1,0
0: l %r14,6f-0b(%r1)
la %r5,32(%r12) # pointer to struct La_s390_32_regs
la %r6,20(%r12) # long int * framesize
bas %r14,0(%r14,%r1) # call resolver
lr %r1,%r2 # function addr returned in r2
ld %f0,56(%r12) # restore call-clobbered arg fprs
ld %f2,64(%r12)
#ifdef RESTORE_VRS
.machine push
.machine "z13"
.machinemode "zarch_nohighgprs"
vlm %v24,%v31,96(%r15) # restore call-clobbered arg vrs
.machine pop
#endif
icm %r0,15,20(%r12) # load & test framesize
jnm 2f
lm %r2,%r6,32(%r12)
lr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
l %r14,16(%r15) # restore registers
l %r12,12(%r15)
br %r1 # tail-call to the resolved function
cfi_def_cfa_register (12)
2: jz 4f # framesize == 0 ?
ahi %r0,7 # align framesize to 8
lhi %r2,-8
nr %r0,%r2
slr %r15,%r0 # make room for framesize bytes
st %r12,0(%r15) # save backchain
la %r2,96(%r15)
la %r3,96(%r12)
srl %r0,3
3: mvc 0(8,%r2),0(%r3) # copy additional parameters
la %r2,8(%r2)
la %r3,8(%r3)
brct %r0,3b
4: lm %r2,%r6,32(%r12) # load register parameters
basr %r14,%r1 # call resolved function
stm %r2,%r3,72(%r12) # store return values r2, r3, f0
std %f0,80(%r12) # to struct La_s390_32_retval
lm %r2,%r3,24(%r12) # load arguments saved by PLT
basr %r1,0
5: l %r14,7f-5b(%r1)
la %r4,32(%r12) # pointer to struct La_s390_32_regs
la %r5,72(%r12) # pointer to struct La_s390_32_retval
bas %r14,0(%r14,%r1) # call _dl_call_pltexit
lr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
l %r14,16(%r15) # restore registers
l %r12,12(%r15)
l %r2,72(%r15) # restore return values
l %r3,76(%r15)
ld %f0,80(%r15)
br %r14
6: .long _dl_profile_fixup - 0b
7: .long _dl_call_pltexit - 5b
cfi_endproc
.size _dl_runtime_profile, .-_dl_runtime_profile
#endif

27
sysdeps/s390/s390-64/dl-machine.h
View File

@ -26,6 +26,7 @@
#include <sys/param.h>
#include <string.h>
#include <link.h>
#include <sysdeps/s390/dl-procinfo.h>
#include <dl-irel.h>
#define ELF_MACHINE_IRELATIVE R_390_IRELATIVE
@ -78,6 +79,10 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
{
extern void _dl_runtime_resolve (Elf64_Word);
extern void _dl_runtime_profile (Elf64_Word);
#if defined HAVE_S390_VX_ASM_SUPPORT
extern void _dl_runtime_resolve_vx (Elf64_Word);
extern void _dl_runtime_profile_vx (Elf64_Word);
#endif
if (l->l_info[DT_JMPREL] && lazy)
{
@ -105,7 +110,14 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
end in this function. */
if (__glibc_unlikely (profile))
{
#if defined HAVE_S390_VX_ASM_SUPPORT
if (GLRO(dl_hwcap) & HWCAP_S390_VX)
got[2] = (Elf64_Addr) &_dl_runtime_profile_vx;
else
got[2] = (Elf64_Addr) &_dl_runtime_profile;
#else
got[2] = (Elf64_Addr) &_dl_runtime_profile;
#endif
if (GLRO(dl_profile) != NULL
&& _dl_name_match_p (GLRO(dl_profile), l))
@ -114,9 +126,18 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
GL(dl_profile_map) = l;
}
else
/* This function will get called to fix up the GOT entry indicated by
the offset on the stack, and then jump to the resolved address. */
got[2] = (Elf64_Addr) &_dl_runtime_resolve;
{
/* This function will get called to fix up the GOT entry indicated by
the offset on the stack, and then jump to the resolved address. */
#if defined HAVE_S390_VX_ASM_SUPPORT
if (GLRO(dl_hwcap) & HWCAP_S390_VX)
got[2] = (Elf64_Addr) &_dl_runtime_resolve_vx;
else
got[2] = (Elf64_Addr) &_dl_runtime_resolve;
#else
got[2] = (Elf64_Addr) &_dl_runtime_resolve;
#endif
}
}
return lazy;

128
sysdeps/s390/s390-64/dl-trampoline.S
View File

@ -16,126 +16,18 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
* with the following linkage:
* r2 - r6 : parameter registers
* f0, f2, f4, f6 : floating point parameter registers
* 48(r15), 56(r15) : PLT arguments PLT1, PLT2
* 160(r15) : additional stack parameters
* The normal clobber rules for function calls apply:
* r0 - r5 : call clobbered
* r6 - r13 : call saved
* r14 : return address (call clobbered)
* r15 : stack pointer (call saved)
* f1, f3, f5, f7 : call saved
* f0 - f3, f5, f7 - f15 : call clobbered
*/
#include <sysdep.h>
.text
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
cfi_startproc
.align 16
_dl_runtime_resolve:
stmg %r2,%r5,64(15) # save call-clobbered argument registers
stg %r14,96(15)
cfi_offset (r14, -64)
lgr %r0,%r15
aghi %r15,-160 # create stack frame
cfi_adjust_cfa_offset (160)
stg %r0,0(%r15) # write backchain
lmg %r2,%r3,208(%r15)# load args saved by PLT
brasl %r14,_dl_fixup # call fixup
lgr %r1,%r2 # function addr returned in r2
aghi %r15,160 # remove stack frame
cfi_adjust_cfa_offset (-160)
lg %r14,96(15) # restore registers
lmg %r2,%r5,64(15)
br %r1
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
/* Create variant of _dl_runtime_resolve/profile for machines before z13.
No vector registers are saved/restored. */
#include <dl-trampoline.h>
#ifndef PROF
.globl _dl_runtime_profile
.type _dl_runtime_profile, @function
cfi_startproc
.align 16
_dl_runtime_profile:
stmg %r2,%r6,64(%r15) # save call-clobbered arg regs
std %f0,104(%r15) # + r6 needed as arg for
std %f2,112(%r15) # _dl_profile_fixup
std %f4,120(%r15)
std %f6,128(%r15)
stg %r12,24(%r15) # r12 is used as backup of r15
stg %r14,32(%r15)
cfi_offset (r6, -96)
cfi_offset (f0, -56)
cfi_offset (f2, -48)
cfi_offset (f4, -40)
cfi_offset (f6, -32)
cfi_offset (r12, -136)
cfi_offset (r14, -128)
lgr %r12,%r15 # backup stack pointer
cfi_def_cfa_register (12)
aghi %r15,-160 # create stack frame
stg %r12,0(%r15) # save backchain
lmg %r2,%r3,48(%r12) # load arguments saved by PLT
lgr %r4,%r14 # return address as third parameter
la %r5,64(%r12) # pointer to struct La_s390_32_regs
la %r6,40(%r12) # long int * framesize
brasl %r14,_dl_profile_fixup # call resolver
lgr %r1,%r2 # function addr returned in r2
lg %r0,40(%r12) # load framesize
ltgr %r0,%r0
jnm 1f
lmg %r2,%r6,64(%r12) # framesize < 0 means no pltexit call
ld %f0,104(%r12) # so we can do a tail call without
ld %f2,112(%r12) # copying the arg overflow area
ld %f4,120(%r12)
ld %f6,128(%r12)
lgr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
lg %r14,32(%r15) # restore registers
lg %r12,24(%r15)
br %r1 # tail-call to resolved function
cfi_def_cfa_register (12)
1: jz 4f # framesize == 0 ?
aghi %r0,7 # align framesize to 8
nill %r0,0xfff8
slgr %r15,%r0 # make room for framesize bytes
stg %r12,0(%r15)
la %r2,160(%r15)
la %r3,160(%r12)
srlg %r0,%r0,3
3: mvc 0(8,%r2),0(%r3) # copy additional parameters
la %r2,8(%r2)
la %r3,8(%r3)
brctg %r0,3b
4: lmg %r2,%r6,64(%r12) # load register parameters
ld %f0,104(%r12) # restore call-clobbered arg regs
ld %f2,112(%r12)
ld %f4,120(%r12)
ld %f6,128(%r12)
basr %r14,%r1 # call resolved function
stg %r2,136(%r12)
std %f0,144(%r12)
lmg %r2,%r3,48(%r12) # load arguments saved by PLT
la %r4,32(%r12) # pointer to struct La_s390_32_regs
la %r5,72(%r12) # pointer to struct La_s390_32_retval
brasl %r14,_dl_call_pltexit
lgr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
lg %r14,32(%r15) # restore registers
lg %r12,24(%r15)
br %r14
cfi_endproc
.size _dl_runtime_profile, .-_dl_runtime_profile
#if defined HAVE_S390_VX_ASM_SUPPORT
/* Create variant of _dl_runtime_resolve/profile for z13 and newer.
The vector registers are saved/restored, too.*/
# define _dl_runtime_resolve _dl_runtime_resolve_vx
# define _dl_runtime_profile _dl_runtime_profile_vx
# define RESTORE_VRS
# include <dl-trampoline.h>
#endif

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sysdeps/s390/s390-64/dl-trampoline.h Normal file
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/* PLT trampolines. s390x version.
Copyright (C) 2016 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/>. */
/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
* with the following linkage:
* r2 - r6 : parameter registers
* f0, f2, f4, f6 : floating point parameter registers
* v24, v26, v28, v30, v25, v27, v29, v31 : vector parameter registers
* 48(r15), 56(r15) : PLT arguments PLT1, PLT2
* 160(r15) : additional stack parameters
* The normal clobber rules for function calls apply:
* r0 - r5 : call clobbered
* r6 - r13 : call saved
* r14 : return address (call clobbered)
* r15 : stack pointer (call saved)
* f0 - f7 : call clobbered
* f8 - f15 : call saved
* v0 - v7 : bytes 0-7 overlap with f0-f7: call clobbered
bytes 8-15: call clobbered
* v8 - v15 : bytes 0-7 overlap with f8-f15: call saved
bytes 8-15: call clobbered
* v16 - v31 : call clobbered
*/
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, @function
cfi_startproc
.align 16
_dl_runtime_resolve:
stmg %r2,%r5,64(%r15) # save call-clobbered argument registers
cfi_offset (r2, -96)
cfi_offset (r3, -88)
cfi_offset (r4, -80)
cfi_offset (r5, -72)
std %f0,104(%r15)
cfi_offset (f0, -56)
std %f2,112(%r15)
cfi_offset (f2, -48)
std %f4,120(%r15)
cfi_offset (f4, -40)
std %f6,128(%r15)
cfi_offset (f6, -32)
stg %r14,96(15)
cfi_offset (r14, -64)
lmg %r2,%r3,48(%r15) # load args for fixup saved by PLT
lgr %r0,%r15
#ifdef RESTORE_VRS
aghi %r15,-288 # create stack frame
cfi_adjust_cfa_offset (288)
.machine push
.machine "z13"
vstm %v24,%v31,160(%r15)# store call-clobbered vector argument registers
cfi_offset (v24, -288)
cfi_offset (v25, -272)
cfi_offset (v26, -256)
cfi_offset (v27, -240)
cfi_offset (v28, -224)
cfi_offset (v29, -208)
cfi_offset (v30, -192)
cfi_offset (v31, -176)
.machine pop
#else
aghi %r15,-160 # create stack frame
cfi_adjust_cfa_offset (160)
#endif
stg %r0,0(%r15) # write backchain
brasl %r14,_dl_fixup # call _dl_fixup
lgr %r1,%r2 # function addr returned in r2
#ifdef RESTORE_VRS
.machine push
.machine "z13"
vlm %v24,%v31,160(%r15)# restore vector registers
.machine pop
aghi %r15,288 # remove stack frame
cfi_adjust_cfa_offset (-288)
#else
aghi %r15,160 # remove stack frame
cfi_adjust_cfa_offset (-160)
#endif
lg %r14,96(%r15) # restore registers
ld %f0,104(%r15)
ld %f2,112(%r15)
ld %f4,120(%r15)
ld %f6,128(%r15)
lmg %r2,%r5,64(%r15)
br %r1
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
#ifndef PROF
.globl _dl_runtime_profile
.type _dl_runtime_profile, @function
cfi_startproc
.align 16
_dl_runtime_profile:
stmg %r2,%r6,64(%r15) # save call-clobbered arg regs
cfi_offset (r2, -96) # + r6 needed as arg for
cfi_offset (r3, -88) # _dl_profile_fixup
cfi_offset (r4, -80)
cfi_offset (r5, -72)
cfi_offset (r6, -64)
std %f0,104(%r15)
cfi_offset (f0, -56)
std %f2,112(%r15)
cfi_offset (f2, -48)
std %f4,120(%r15)
cfi_offset (f4, -40)
std %f6,128(%r15)
cfi_offset (f6, -32)
stg %r12,24(%r15) # r12 is used as backup of r15
cfi_offset (r12, -136)
stg %r14,32(%r15)
cfi_offset (r14, -128)
lgr %r12,%r15 # backup stack pointer
cfi_def_cfa_register (12)
#ifdef RESTORE_VRS
aghi %r15,-288 # create stack frame
.machine push
.machine "z13"
vstm %v24,%v31,160(%r15)# store call-clobbered vector argument registers
cfi_offset (v24, -288)
cfi_offset (v25, -272)
cfi_offset (v26, -256)
cfi_offset (v27, -240)
cfi_offset (v28, -224)
cfi_offset (v29, -208)
cfi_offset (v30, -192)
cfi_offset (v31, -176)
.machine pop
#else
aghi %r15,-160 # create stack frame
#endif
stg %r12,0(%r15) # save backchain
lmg %r2,%r3,48(%r12) # load arguments saved by PLT
lgr %r4,%r14 # return address as third parameter
la %r5,64(%r12) # pointer to struct La_s390_64_regs
la %r6,40(%r12) # long int * framesize
brasl %r14,_dl_profile_fixup # call resolver
lgr %r1,%r2 # function addr returned in r2
ld %f0,104(%r12) # restore call-clobbered arg fprs
ld %f2,112(%r12)
ld %f4,120(%r12)
ld %f6,128(%r12)
#ifdef RESTORE_VRS
.machine push
.machine "z13"
vlm %v24,%v31,160(%r15) # restore call-clobbered arg vrs
.machine pop
#endif
lg %r0,40(%r12) # load framesize
ltgr %r0,%r0
jnm 1f
lmg %r2,%r6,64(%r12) # framesize < 0 means no pltexit call
# so we can do a tail call without
# copying the arg overflow area
lgr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
lg %r14,32(%r15) # restore registers
lg %r12,24(%r15)
br %r1 # tail-call to resolved function
cfi_def_cfa_register (12)
1: jz 4f # framesize == 0 ?
aghi %r0,7 # align framesize to 8
nill %r0,0xfff8
slgr %r15,%r0 # make room for framesize bytes
stg %r12,0(%r15) # save backchain
la %r2,160(%r15)
la %r3,160(%r12)
srlg %r0,%r0,3
3: mvc 0(8,%r2),0(%r3) # copy additional parameters
la %r2,8(%r2) # depending on framesize
la %r3,8(%r3)
brctg %r0,3b
4: lmg %r2,%r6,64(%r12) # restore call-clobbered arg gprs
basr %r14,%r1 # call resolved function
stg %r2,136(%r12) # store return values r2, f0
std %f0,144(%r12) # to struct La_s390_64_retval
lmg %r2,%r3,48(%r12) # load arguments saved by PLT
la %r4,64(%r12) # pointer to struct La_s390_64_regs
la %r5,136(%r12) # pointer to struct La_s390_64_retval
brasl %r14,_dl_call_pltexit
lgr %r15,%r12 # remove stack frame
cfi_def_cfa_register (15)
lg %r14,32(%r15) # restore registers
lg %r12,24(%r15)
lg %r2,136(%r15) # restore return values
ld %f0,144(%r15)
br %r14 # Jump back to caller
cfi_endproc
.size _dl_runtime_profile, .-_dl_runtime_profile
#endif