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green
2001-04-22 18:22:43 +00:00
parent a8b0d40ff9
commit 7247436b5f
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161
libffi/src/s390/sysv.S
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/* -----------------------------------------------------------------------
sysv.S - Copyright (c) 2000 Software AG
S390 Foreign Function Interface
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
``Software''), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL CYGNUS SOLUTIONS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
----------------------------------------------------------------------- */
#define LIBFFI_ASM
#include <ffi.h>
#ifdef HAVE_MACHINE_ASM_H
#include <machine/asm.h>
#endif
.text
# r2: ffi_prep_args
# r3: &ecif
# r4: cif->bytes
# r5: fig->flags
# r6: ecif.rvalue
# sp+0: fn
# This assumes we are using gas.
.globl ffi_call_SYSV
.type ffi_call_SYSV,%function
ffi_call_SYSV:
# Save registers
stm %r7,%r15,28(%r15)
l %r7,96(%r15) # Get A(fn)
lr %r0,%r15
ahi %r15,-128 # Make room for my args
st %r0,0(%r15) # Set backchain
lr %r11,%r15 # Establish my stack register
sr %r15,%r4 # Make room for fn args
ahi %r15,-96 # Make room for new frame
lr %r10,%r15 # Establish stack build area
ahi %r15,-96 # Stack for next call
lr %r1,%r7
stm %r2,%r7,96(%r11) # Save args on my stack
#------------------------------------------------------------------
# move first 3 parameters in registers
#------------------------------------------------------------------
lr %r9,%r2 # r9: &ffi_prep_args
lr %r2,%r10 # Parm 1: &stack Parm 2: &ecif
basr %r14,%r9 # call ffi_prep_args
#------------------------------------------------------------------
# load first 5 parameter registers
#------------------------------------------------------------------
lm %r2,%r6,24(%r10)
#------------------------------------------------------------------
# load fp parameter registers
#------------------------------------------------------------------
ld %f0,48(%r10)
ld %f2,56(%r10)
#------------------------------------------------------------------
# call function
#------------------------------------------------------------------
lr %r15,%r10 # Set new stack
l %r9,116(%r11) # Get &fn
basr %r14,%r9 # Call function
#------------------------------------------------------------------
# On return:
# r2: Return value (r3: Return value + 4 for long long)
#------------------------------------------------------------------
#------------------------------------------------------------------
# If the return value pointer is NULL, assume no return value.
#------------------------------------------------------------------
icm %r6,15,112(%r11)
jz .Lepilogue
l %r5,108(%r11) # Get return type
#------------------------------------------------------------------
# return INT
#------------------------------------------------------------------
chi %r5,FFI_TYPE_INT
jne .Lchk64
st %r2,0(%r6)
j .Lepilogue
.Lchk64:
#------------------------------------------------------------------
# return LONG LONG (signed/unsigned)
#------------------------------------------------------------------
chi %r5,FFI_TYPE_UINT64
je .LdoLongLong
chi %r5,FFI_TYPE_SINT64
jne .LchkFloat
.LdoLongLong:
stm %r2,%r3,0(%r6)
j .Lepilogue
.LchkFloat:
#------------------------------------------------------------------
# return FLOAT
#------------------------------------------------------------------
chi %r5,FFI_TYPE_FLOAT
jne .LchkDouble
std %f0,0(%r6)
j .Lepilogue
.LchkDouble:
#------------------------------------------------------------------
# return DOUBLE or LONGDOUBLE
#------------------------------------------------------------------
chi %r5,FFI_TYPE_DOUBLE
jne .LchkStruct
std %f0,0(%r6)
std %f2,8(%r6)
j .Lepilogue
.LchkStruct:
#------------------------------------------------------------------
# Structure - rvalue already set as sent as 1st parm to routine
#------------------------------------------------------------------
chi %r5,FFI_TYPE_STRUCT
je .Lepilogue
.Ldefault:
#------------------------------------------------------------------
# return a pointer
#------------------------------------------------------------------
st %r2,0(%r6)
j .Lepilogue
.Lepilogue:
l %r15,0(%r11)
l %r4,56(%r15)
lm %r7,%r15,28(%r15)
br %r4
.ffi_call_SYSV_end:
.size ffi_call_SYSV,.ffi_call_SYSV_end-ffi_call_SYSV