mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 14:50:17 +00:00
a8e211daea
It consolidates the code required to call la_pltexit audit
callback.
Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
(cherry picked from commit 8c0664e2b8)
Resolved conflicts:
sysdeps/hppa/dl-runtime.c
362 lines
10 KiB
ArmAsm
362 lines
10 KiB
ArmAsm
/* PLT trampolines. hppa version.
|
|
Copyright (C) 2005-2021 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* This code gets called via the .plt stub, and is used in
|
|
dl-runtime.c to call the `_dl_fixup' function and then redirect
|
|
to the address it returns. `_dl_fixup' takes two arguments, however
|
|
`_dl_profile_fixup' takes a number of parameters for use with
|
|
library auditing (LA).
|
|
|
|
WARNING: This template is also used by gcc's __cffc, and expects
|
|
that the "bl" for _dl_runtime_resolve exist at a particular offset.
|
|
Do not change this template without changing gcc, while the prefix
|
|
"bl" should fix everything so gcc finds the right spot, it will
|
|
slow down __cffc when it attempts to call fixup to resolve function
|
|
descriptor references. Please refer to gcc/gcc/config/pa/fptr.c
|
|
|
|
Enter with r19 = reloc offset, r20 = got-8, r21 = fixup ltp, r22 = fp. */
|
|
|
|
/* RELOCATION MARKER: bl to provide gcc's __cffc with fixup loc. */
|
|
.text
|
|
/* THIS CODE DOES NOT EXECUTE */
|
|
bl _dl_fixup, %r2
|
|
.text
|
|
.global _dl_runtime_resolve
|
|
.type _dl_runtime_resolve,@function
|
|
cfi_startproc
|
|
.align 4
|
|
_dl_runtime_resolve:
|
|
.PROC
|
|
.CALLINFO FRAME=128,CALLS,SAVE_RP,ENTRY_GR=3
|
|
.ENTRY
|
|
/* SAVE_RP says we do */
|
|
stw %rp, -20(%sp)
|
|
|
|
/* Save static link register */
|
|
stw %r29,-16(%sp)
|
|
/* Save argument registers */
|
|
stw %r26,-36(%sp)
|
|
stw %r25,-40(%sp)
|
|
stw %r24,-44(%sp)
|
|
stw %r23,-48(%sp)
|
|
|
|
/* Build a call frame, and save structure pointer. */
|
|
copy %sp, %r1 /* Copy previous sp */
|
|
/* Save function result address (on entry) */
|
|
stwm %r28,128(%sp)
|
|
/* Fill in some frame info to follow ABI */
|
|
stw %r1,-4(%sp) /* Previous sp */
|
|
stw %r21,-32(%sp) /* PIC register value */
|
|
|
|
/* Save input floating point registers. This must be done
|
|
in the new frame since the previous frame doesn't have
|
|
enough space */
|
|
ldo -64(%sp),%r1
|
|
fstd,ma %fr4,-8(%r1)
|
|
fstd,ma %fr5,-8(%r1)
|
|
fstd,ma %fr6,-8(%r1)
|
|
|
|
/* Test PA_GP_RELOC bit. */
|
|
bb,>= %r19,31,2f /* branch if not reloc offset */
|
|
fstd,ma %fr7,-8(%r1)
|
|
|
|
/* Set up args to fixup func, needs only two arguments */
|
|
ldw 8+4(%r20),%r26 /* (1) got[1] == struct link_map */
|
|
copy %r19,%r25 /* (2) reloc offset */
|
|
|
|
/* Call the real address resolver. */
|
|
3: bl _dl_fixup,%rp
|
|
copy %r21,%r19 /* set fixup func ltp */
|
|
|
|
/* While the linker will set a function pointer to NULL when it
|
|
encounters an undefined weak function, we need to dynamically
|
|
detect removed weak functions. The issue arises because a weak
|
|
__gmon_start__ function was added to shared executables to work
|
|
around issues in _init that are now resolved. The presence of
|
|
__gmon_start__ in every shared library breaks the linker
|
|
`--as-needed' option. This __gmon_start__ function does nothing
|
|
but removal is tricky. Depending on the binding, removal can
|
|
cause an application using it to fault. The call to _dl_fixup
|
|
returns NULL when a function isn't resolved. In order to help
|
|
with __gmon_start__ removal, we return directly to the caller
|
|
when _dl_fixup returns NULL. This check could be removed when
|
|
BZ 19170 is fixed. */
|
|
comib,= 0,%r28,1f
|
|
|
|
/* Load up the returned func descriptor */
|
|
copy %r28, %r22
|
|
copy %r29, %r19
|
|
|
|
/* Reload arguments fp args */
|
|
ldo -64(%sp),%r1
|
|
fldd,ma -8(%r1),%fr4
|
|
fldd,ma -8(%r1),%fr5
|
|
fldd,ma -8(%r1),%fr6
|
|
fldd,ma -8(%r1),%fr7
|
|
|
|
/* Adjust sp, and restore function result address*/
|
|
ldwm -128(%sp),%r28
|
|
|
|
/* Reload static link register */
|
|
ldw -16(%sp),%r29
|
|
/* Reload general args */
|
|
ldw -36(%sp),%r26
|
|
ldw -40(%sp),%r25
|
|
ldw -44(%sp),%r24
|
|
ldw -48(%sp),%r23
|
|
|
|
/* Jump to new function, but return to previous function */
|
|
bv %r0(%r22)
|
|
ldw -20(%sp),%rp
|
|
|
|
1:
|
|
/* Return to previous function */
|
|
ldw -148(%sp),%rp
|
|
bv %r0(%rp)
|
|
ldo -128(%sp),%sp
|
|
|
|
2:
|
|
/* Set up args for _dl_fix_reloc_arg. */
|
|
copy %r22,%r26 /* (1) function pointer */
|
|
depi 0,31,2,%r26 /* clear least significant bits */
|
|
ldw 8+4(%r20),%r25 /* (2) got[1] == struct link_map */
|
|
|
|
/* Save ltp and link map arg for _dl_fixup. */
|
|
stw %r21,-56(%sp) /* ltp */
|
|
stw %r25,-60(%sp) /* struct link map */
|
|
|
|
/* Find reloc offset. */
|
|
bl _dl_fix_reloc_arg,%rp
|
|
copy %r21,%r19 /* set func ltp */
|
|
|
|
/* Set up args for _dl_fixup. */
|
|
ldw -56(%sp),%r21 /* ltp */
|
|
ldw -60(%sp),%r26 /* (1) struct link map */
|
|
b 3b
|
|
copy %ret0,%r25 /* (2) reloc offset */
|
|
.EXIT
|
|
.PROCEND
|
|
cfi_endproc
|
|
.size _dl_runtime_resolve, . - _dl_runtime_resolve
|
|
|
|
.text
|
|
.global _dl_runtime_profile
|
|
.type _dl_runtime_profile,@function
|
|
cfi_startproc
|
|
.align 4
|
|
_dl_runtime_profile:
|
|
.PROC
|
|
.CALLINFO FRAME=192,CALLS,SAVE_RP,ENTRY_GR=3
|
|
.ENTRY
|
|
|
|
/* SAVE_RP says we do */
|
|
stw %rp, -20(%sp)
|
|
/* Save static link register */
|
|
stw %r29,-16(%sp)
|
|
|
|
/* Build a call frame, and save structure pointer. */
|
|
copy %sp, %r1 /* Copy previous sp */
|
|
/* Save function result address (on entry) */
|
|
stwm %r28,192(%sp)
|
|
/* Fill in some frame info to follow ABI */
|
|
stw %r1,-4(%sp) /* Previous sp */
|
|
stw %r21,-32(%sp) /* PIC register value */
|
|
|
|
/* Create La_hppa_retval */
|
|
/* -140, lrv_r28
|
|
-136, lrv_r29
|
|
-132, 4 byte pad
|
|
-128, lr_fr4 (8 bytes) */
|
|
|
|
/* Create save space for _dl_profile_fixup arguments
|
|
-120, Saved reloc offset
|
|
-116, Saved struct link_map
|
|
-112, *framesizep */
|
|
|
|
/* Create La_hppa_regs */
|
|
/* 32-bit registers */
|
|
stw %r26,-108(%sp)
|
|
stw %r25,-104(%sp)
|
|
stw %r24,-100(%sp)
|
|
stw %r23,-96(%sp)
|
|
/* -92, 4 byte pad */
|
|
/* 64-bit floating point registers */
|
|
ldo -88(%sp),%r1
|
|
fstd,ma %fr4,8(%r1)
|
|
fstd,ma %fr5,8(%r1)
|
|
fstd,ma %fr6,8(%r1)
|
|
fstd,ma %fr7,8(%r1)
|
|
|
|
/* Test PA_GP_RELOC bit. */
|
|
bb,>= %r19,31,2f /* branch if not reloc offset */
|
|
/* 32-bit stack pointer */
|
|
stw %sp,-56(%sp)
|
|
|
|
/* Set up args to fixup func, needs five arguments */
|
|
ldw 8+4(%r20),%r26 /* (1) got[1] == struct link_map */
|
|
stw %r26,-116(%sp) /* Save struct link_map */
|
|
copy %r19,%r25 /* (2) reloc offset */
|
|
stw %r25,-120(%sp) /* Save reloc offset */
|
|
copy %rp,%r24 /* (3) profile_fixup needs rp */
|
|
ldo -56(%sp),%r23 /* (4) La_hppa_regs */
|
|
ldo -112(%sp), %r1
|
|
stw %r1, -52(%sp) /* (5) long int *framesizep */
|
|
|
|
/* Call the real address resolver. */
|
|
3: bl _dl_profile_fixup,%rp
|
|
copy %r21,%r19 /* set fixup func ltp */
|
|
|
|
/* Load up the returned function descriptor */
|
|
copy %r28, %r22
|
|
copy %r29, %r19
|
|
|
|
/* Restore gr/fr/sp/rp */
|
|
ldw -108(%sp),%r26
|
|
ldw -104(%sp),%r25
|
|
ldw -100(%sp),%r24
|
|
ldw -96(%sp),%r23
|
|
/* -92, 4 byte pad, skip */
|
|
ldo -88(%sp),%r1
|
|
fldd,ma 8(%r1),%fr4
|
|
fldd,ma 8(%r1),%fr5
|
|
fldd,ma 8(%r1),%fr6
|
|
fldd,ma 8(%r1),%fr7
|
|
|
|
/* Reload rp register -(192+20) without adjusting stack */
|
|
ldw -212(%sp),%rp
|
|
|
|
/* Reload static link register -(192+16) without adjusting stack */
|
|
ldw -208(%sp),%r29
|
|
|
|
/* *framesizep is >= 0 if we have to run pltexit */
|
|
ldw -112(%sp),%r28
|
|
cmpb,>>=,N %r0,%r28,L(cpe)
|
|
|
|
/* Adjust sp, and restore function result address*/
|
|
ldwm -192(%sp),%r28
|
|
/* Jump to new function, but return to previous function */
|
|
bv %r0(%r22)
|
|
ldw -20(%sp),%rp
|
|
/* NO RETURN */
|
|
|
|
L(nf):
|
|
/* Call the returned function descriptor */
|
|
bv %r0(%r22)
|
|
nop
|
|
b,n L(cont)
|
|
|
|
L(cpe):
|
|
/* We are going to call the resolved function, but we have a
|
|
stack frame in the middle. We use the value of framesize to
|
|
guess how much extra frame we need, and how much frame to
|
|
copy forward. */
|
|
|
|
/* Round to nearest multiple of 64 */
|
|
addi 63, %r28, %r28
|
|
depi 0, 27, 6, %r28
|
|
|
|
/* Calcualte start of stack copy */
|
|
ldo -192(%sp),%r2
|
|
|
|
/* Increate the stack by *framesizep */
|
|
copy %sp, %r1
|
|
add %sp, %r28, %sp
|
|
/* Save stack pointer */
|
|
stw %r1, -4(%sp)
|
|
|
|
/* Single byte copy of prevous stack onto newly allocated stack */
|
|
1: ldb %r28(%r2), %r1
|
|
add %r28, %sp, %r26
|
|
stb %r1, 0(%r26)
|
|
addi,< -1,%r28,%r28
|
|
b,n 1b
|
|
|
|
/* Retore r28 and r27 and r2 already points at -192(%sp) */
|
|
ldw 0(%r2),%r28
|
|
ldw 84(%r2),%r26
|
|
|
|
/* Calculate address of L(cont) */
|
|
b,l L(nf),%r2
|
|
depwi 0,31,2,%r2
|
|
L(cont):
|
|
/* Undo fake stack */
|
|
ldw -4(%sp),%r1
|
|
copy %r1, %sp
|
|
|
|
/* Arguments to _dl_audit_pltexit */
|
|
ldw -116(%sp), %r26 /* (1) got[1] == struct link_map */
|
|
ldw -120(%sp), %r25 /* (2) reloc offsets */
|
|
ldo -56(%sp), %r24 /* (3) *La_hppa_regs */
|
|
ldo -124(%sp), %r23 /* (4) *La_hppa_retval */
|
|
|
|
/* Fill *La_hppa_retval */
|
|
stw %r28,-140(%sp)
|
|
stw %r29,-136(%sp)
|
|
ldo -128(%sp), %r1
|
|
fstd %fr4,0(%r1)
|
|
|
|
/* Call _dl_audit_pltexit */
|
|
bl _dl_audit_pltexit,%rp
|
|
nop
|
|
|
|
/* Restore *La_hppa_retval */
|
|
ldw -140(%sp), %r28
|
|
ldw -136(%sp), %r29
|
|
ldo -128(%sp), %r1
|
|
fldd 0(%r1), %fr4
|
|
|
|
/* Unwind the stack */
|
|
ldo 192(%sp),%sp
|
|
/* Retore callers rp */
|
|
ldw -20(%sp),%rp
|
|
/* Return */
|
|
bv,n 0(%r2)
|
|
|
|
2:
|
|
/* Set up args for _dl_fix_reloc_arg. */
|
|
copy %r22,%r26 /* (1) function pointer */
|
|
depi 0,31,2,%r26 /* clear least significant bits */
|
|
ldw 8+4(%r20),%r25 /* (2) got[1] == struct link_map */
|
|
|
|
/* Save ltp and link map arg for _dl_fixup. */
|
|
stw %r21,-92(%sp) /* ltp */
|
|
stw %r25,-116(%sp) /* struct link map */
|
|
|
|
/* Find reloc offset. */
|
|
bl _dl_fix_reloc_arg,%rp
|
|
copy %r21,%r19 /* set func ltp */
|
|
|
|
/* Restore fixup ltp. */
|
|
ldw -92(%sp),%r21 /* ltp */
|
|
|
|
/* Set up args to fixup func, needs five arguments */
|
|
ldw -116(%sp),%r26 /* (1) struct link map */
|
|
copy %ret0,%r25 /* (2) reloc offset */
|
|
stw %r25,-120(%sp) /* Save reloc offset */
|
|
ldw -212(%sp),%r24 /* (3) profile_fixup needs rp */
|
|
ldo -56(%sp),%r23 /* (4) La_hppa_regs */
|
|
ldo -112(%sp), %r1
|
|
b 3b
|
|
stw %r1, -52(%sp) /* (5) long int *framesizep */
|
|
.EXIT
|
|
.PROCEND
|
|
cfi_endproc
|
|
.size _dl_runtime_profile, . - _dl_runtime_profile
|