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| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2018-08-10 09:07:43 +0200 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.ibm.com> | 2018-08-10 09:07:43 +0200 |
| commit | 5755f5e4ccc97f6a502d4a176ccec87a98f1c866 (patch) | |
| tree | 5aa2ed66b269881fb31bf30c4643f1acb4373ea8 /sysdeps/s390/s390-64 | |
| parent | c8ad85225bd5968e45c716519d88743811dbdb3e (diff) | |
| download | glibc-5755f5e4ccc97f6a502d4a176ccec87a98f1c866.tar.gz glibc-5755f5e4ccc97f6a502d4a176ccec87a98f1c866.tar.xz glibc-5755f5e4ccc97f6a502d4a176ccec87a98f1c866.zip | |
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.
Diffstat (limited to 'sysdeps/s390/s390-64')
| -rw-r--r-- | sysdeps/s390/s390-64/dl-trampoline.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/sysdeps/s390/s390-64/dl-trampoline.h b/sysdeps/s390/s390-64/dl-trampoline.h index e05974322c..a9d56a6925 100644 --- a/sysdeps/s390/s390-64/dl-trampoline.h +++ b/sysdeps/s390/s390-64/dl-trampoline.h @@ -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 |