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S390: Do not clobber R0 in 64-bit _dl_runtime_resolve 

Preparation for the usage of R0 by __fentry__.

ChangeLog:

	* sysdeps/s390/s390-64/dl-trampoline.h (_dl_runtime_resolve):
	Do not clobber R0.
This commit is contained in:
Ilya Leoshkevich 2018-08-10 09:07:43 +02:00 committed by Stefan Liebler
parent c8ad85225b
commit 5755f5e4cc
2 changed files with 13 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-08-10 Ilya Leoshkevich <iii@linux.ibm.com>
* sysdeps/s390/s390-64/dl-trampoline.h (_dl_runtime_resolve):
Do not clobber R0.
2018-08-10 Ilya Leoshkevich <iii@linux.ibm.com>
* sysdeps/s390/s390-32/dl-trampoline.h (_dl_runtime_profile):

10
sysdeps/s390/s390-64/dl-trampoline.h
View File

@ -23,8 +23,9 @@
* 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
* The slightly tightened normal clobber rules for function calls apply:
* r0 : call saved (for __fentry__)
* r1 - r5 : call clobbered
* r6 - r13 : call saved
* r14 : return address (call clobbered)
* r15 : stack pointer (call saved)
@ -47,6 +48,7 @@
#define V29_OFF -208
#define V30_OFF -192
#define V31_OFF -176
#define R0_OFF -120
#define PLT1_OFF -112
#define PLT2_OFF -104
#define R2_OFF -96
@ -64,6 +66,8 @@
cfi_startproc
.align 16
_dl_runtime_resolve:
stg %r0,CFA_OFF+R0_OFF(%r15)
cfi_offset (r0, R0_OFF)
stmg %r2,%r5,CFA_OFF+R2_OFF(%r15) # save registers
cfi_offset (r2, R2_OFF)
cfi_offset (r3, R3_OFF)
@ -120,6 +124,7 @@ _dl_runtime_resolve:
ld %f4,CFA_OFF+F4_OFF(%r15)
ld %f6,CFA_OFF+F6_OFF(%r15)
lmg %r2,%r5,CFA_OFF+R2_OFF(%r15)
lg %r0,CFA_OFF+R0_OFF(%r15)
br %r1
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
@ -131,6 +136,7 @@ _dl_runtime_resolve:
#undef V29_OFF
#undef V30_OFF
#undef V31_OFF
#undef R0_OFF
#undef PLT1_OFF
#undef PLT2_OFF
#undef R2_OFF