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s390: Use pc-relative insns in 31-bit mode

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It's silly to stick to esa/390 features when the compiler won't.
Detect when brasl and larl are used by the compiler and then use
them in the assembly.
This commit is contained in:
Richard Henderson
2014-12-18 16:21:07 -05:00
parent 2f530de168
commit f69ec6f35d
2 changed files with 34 additions and 2 deletions
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17
configure.ac
View File

@@ -183,6 +183,23 @@ if test x$TARGET = xX86 || test x$TARGET = xX86_WIN32 || test x$TARGET = xX86_64
fi
fi
if test x$TARGET = xS390; then
AC_CACHE_CHECK([compiler uses zarch features],
libffi_cv_as_s390_zarch, [
libffi_cv_as_s390_zarch=no
echo 'void foo(void) { bar(); bar(); }' > conftest.c
if $CC $CFLAGS -S conftest.c > /dev/null 2>&1; then
if grep -q brasl conftest.s; then
libffi_cv_as_s390_zarch=yes
fi
fi
])
if test "x$libffi_cv_as_s390_zarch" = xyes; then
AC_DEFINE(HAVE_AS_S390_ZARCH, 1,
[Define if the compiler uses zarch features.])
fi
fi
# On PaX enable kernels that have MPROTECT enable we can't use PROT_EXEC.
AC_ARG_ENABLE(pax_emutramp,
[ --enable-pax_emutramp enable pax emulated trampolines, for we can't use PROT_EXEC],

19
src/s390/sysv.S
View File

@@ -55,13 +55,21 @@ ffi_call_SYSV:
.cfi_rel_offset r14, 56
.cfi_def_cfa_register r13
l %r15,60(%r2) # Set up outgoing stack
#ifdef HAVE_AS_S390_ZARCH
larl %r14,.Ltable
#else
basr %r14,0 # Set up base register
.Lbase:
#endif
sla %r3,3 # ret_type *= 8
lr %r12,%r4 # Save ret_addr
lr %r1,%r5 # Save fun
lr %r0,%r6 # Install static chain
#ifdef HAVE_AS_S390_ZARCH
la %r14,0(%r14,%r3) # Set return address
#else
la %r14,.Ltable-.Lbase(%r14,%r3) # Set return address
#endif
lm %r2,%r6,8(%r13) # Load arguments
ld %f0,64(%r13)
ld %f2,72(%r13)
@@ -141,10 +149,12 @@ ffi_closure_SYSV:
.cfi_rel_offset r13, 52
.cfi_rel_offset r14, 56
.cfi_rel_offset r15, 60
#ifndef HAVE_AS_S390_ZARCH
basr %r13,0 # Set up base register
.Lcbase:
ahi %r15,-96-8 # Set up stack frame
l %r1,.Lchelper-.Lcbase(%r13) # Get helper function
#endif
ahi %r15,-96-8 # Set up stack frame
st %r12,0(%r15) # Set up back chain
std %f0,64(%r12) # Save fp arguments
@@ -154,7 +164,11 @@ ffi_closure_SYSV:
st %r5,96(%r15)
la %r6,64(%r12) # FPRs
la %r5,8(%r12) # GPRs
#ifdef HAVE_AS_S390_ZARCH
brasl %r14,ffi_closure_helper_SYSV
#else
bas %r14,0(%r1,%r13) # Call helper
#endif
lr %r15,%r12
.cfi_def_cfa_register r15
@@ -165,10 +179,11 @@ ffi_closure_SYSV:
br %r14
.cfi_endproc
#ifndef HAVE_AS_S390_ZARCH
.align 4
.Lchelper:
.long ffi_closure_helper_SYSV-.Lcbase
#endif
.size ffi_closure_SYSV,.-ffi_closure_SYSV