summaryrefslogtreecommitdiff
path: root/sysdeps/s390/s390-32/dl-trampoline.S
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/s390/s390-32/dl-trampoline.S')
-rw-r--r--sysdeps/s390/s390-32/dl-trampoline.S134
1 files changed, 134 insertions, 0 deletions
diff --git a/sysdeps/s390/s390-32/dl-trampoline.S b/sysdeps/s390/s390-32/dl-trampoline.S
new file mode 100644
index 0000000000..fbbbc189db
--- /dev/null
+++ b/sysdeps/s390/s390-32/dl-trampoline.S
@@ -0,0 +1,134 @@
+/* PLT trampolines. s390 version.
+ Copyright (C) 2005 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/* This code is used in dl-runtime.c to call the `fixup' function
+ and then redirect to the address it returns. */
+
+/* The PLT stubs will call _dl_runtime_resolve/_dl_runtime_profile
+ * with the following linkage:
+ * r2 - r6 : parameter registers
+ * f0, f2 : floating point parameter registers
+ * 24(r15), 28(r15) : PLT arguments PLT1, PLT2
+ * 96(r15) : additional stack parameters
+ * The normal clobber rules for function calls apply:
+ * r0 - r5 : call clobbered
+ * r6 - r13 : call saved
+ * r14 : return address (call clobbered)
+ * r15 : stack pointer (call saved)
+ * f4, f6 : call saved
+ * f0 - f3, f5, f7 - f15 : call clobbered
+ */
+
+#include <sysdep.h>
+
+ .text
+ .globl _dl_runtime_resolve
+ .type _dl_runtime_resolve, @function
+ cfi_startproc
+ .align 16
+_dl_runtime_resolve:
+ stm %r2,%r5,32(%r15) # save registers
+ st %r14,8(%r15)
+ lr %r0,%r15 # create stack frame
+ ahi %r15,-96
+ cfi_adjust_cfa_offset (96)
+ st 0,0(%r15)
+ lm %r2,%r3,120(%r15) # load args saved by PLT
+ basr %r1,0
+0: l %r14,1f-0b(%r1)
+ bas %r14,0(%r14,%r1) # call resolver
+ lr %r1,%r2 # function addr returned in r2
+ ahi %r15,96 # remove stack frame
+ cfi_adjust_cfa_offset (-96)
+ l %r14,8(15) # restore registers
+ lm %r2,%r5,32(%r15)
+ br %r1
+1: .long _dl_fixup - 0b
+ cfi_endproc
+ .size _dl_runtime_resolve, .-_dl_runtime_resolve
+
+
+#ifndef PROF
+ .globl _dl_runtime_profile
+ .type _dl_runtime_profile, @function
+ cfi_startproc
+ .align 16
+_dl_runtime_profile:
+ stm %r2,%r6,32(%r15) # save registers
+ std %f0,56(%r15)
+ std %f2,64(%r15)
+ st %r6,8(%r15)
+ st %r12,12(%r15)
+ st %r14,16(%r15)
+ lr %r12,%r15 # create stack frame
+ cfi_def_cfa_register (12)
+ ahi %r15,-96
+ st %r12,0(%r15)
+ lm %r2,%r3,24(%r12) # load arguments saved by PLT
+ lr %r4,%r14 # return address as third parameter
+ basr %r1,0
+0: l %r14,6f-0b(%r1)
+ la %r5,32(%r12) # pointer to struct La_s390_32_regs
+ la %r6,20(%r12) # long int * framesize
+ bas %r14,0(%r14,%r1) # call resolver
+ lr %r1,%r2 # function addr returned in r2
+ icm %r0,15,20(%r12) # load & test framesize
+ jnm 2f
+ lm %r2,%r6,32(%r12)
+ ld %f0,56(%r12)
+ ld %f2,64(%r12)
+ basr %r14,%r1 # call resolved function
+1: lr %r15,%r12 # remove stack frame
+ cfi_def_cfa_register (15)
+ l %r14,16(%r15) # restore registers
+ l %r12,12(%r15)
+ l %r6,8(%r15)
+ br %r14
+ cfi_def_cfa_register (12)
+2: jz 4f # framesize == 0 ?
+ ahi %r0,7 # align framesize to 8
+ lhi %r2,-8
+ nr %r0,%r2
+ slr %r15,%r0 # make room for framesize bytes
+ st %r12,0(%r15)
+ la %r2,96(%r15)
+ la %r3,96(%r12)
+ srl %r0,3
+3: mvc 0(8,%r2),0(%r3) # copy additional parameters
+ la %r2,8(%r2)
+ la %r3,8(%r3)
+ brct %r0,3b
+4: lm %r2,%r6,32(%r12) # load register parameters
+ ld %f0,56(%r12)
+ ld %f2,64(%r12)
+ basr %r14,%r1 # call resolved function
+ stm %r2,%r3,72(%r12)
+ std %f0,80(%r12)
+ lm %r2,%r3,24(%r12) # load arguments saved by PLT
+ basr %r1,0
+5: l %r14,7f-5b(%r1)
+ la %r4,32(%r12) # pointer to struct La_s390_32_regs
+ la %r5,72(%r12) # pointer to struct La_s390_32_retval
+ basr %r14,%r1 # call _dl_call_pltexit
+ j 1b
+6: .long _dl_profile_fixup - 0b
+7: .long _dl_call_pltexit - 5b
+ cfi_endproc
+ .size _dl_runtime_profile, .-_dl_runtime_profile
+#endif