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glibc/sysdeps/hppa/dl-trampoline.S

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/* PLT trampolines. hppa version.
Copyright (C) 2005-2023 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
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