forked from OSchip/llvm-project
add __save_vfp_d8_d15_regs and __restore_vfp_d8_d15_regs for ARM
llvm-svn: 85531
This commit is contained in:
parent
554a75a973
commit
d4b78d38d4
|
@ -0,0 +1,45 @@
|
|||
//===-- save_restore_regs.S - Implement save/restore* ---------------------===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file is distributed under the University of Illinois Open Source
|
||||
// License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "../assembly.h"
|
||||
|
||||
//
|
||||
// When compiling C++ functions that need to handle thrown exceptions the
|
||||
// compiler is required to save all registers and call __Unwind_SjLj_Register
|
||||
// in the function prolog. But when compiling for thumb1, there are
|
||||
// no instructions to access the floating point registers, so the
|
||||
// compiler needs to add a call to the helper function _save_vfp_d8_d15_regs
|
||||
// written in ARM to save the float registers. In the epilog, the compiler
|
||||
// must also add a call to __restore_vfp_d8_d15_regs to restore those registers.
|
||||
//
|
||||
|
||||
.text
|
||||
.syntax unified
|
||||
|
||||
//
|
||||
// Save registers d8-d15 onto stack
|
||||
//
|
||||
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs)
|
||||
vstmdb sp!, {d8-d15} // push registers d8-d15 onto stack
|
||||
bx lr // return to prolog
|
||||
|
||||
|
||||
|
||||
//
|
||||
// Restore registers d8-d15 from stack
|
||||
//
|
||||
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__restore_vfp_d8_d15_regs)
|
||||
vldmia sp!, {d8-d15} // pop registers d8-d15 off stack
|
||||
bx lr // return to prolog
|
||||
|
||||
|
||||
|
||||
// tell linker it can break up file at label boundaries
|
||||
.subsections_via_symbols
|
||||
|
|
@ -58,7 +58,7 @@ Funcs_armv6 = adddf3vfp.o addsf3vfp.o bswapdi2.o bswapsi2.o divdf3vfp.o \
|
|||
muldf3vfp.o mulsf3vfp.o \
|
||||
nedf2vfp.o negdf2vfp.o negsf2vfp.o nesf2vfp.o \
|
||||
subdf3vfp.o subsf3vfp.o truncdfsf2vfp.o unorddf2vfp.o unordsf2vfp.o \
|
||||
modsi3.o umodsi3.o udivsi3.o divsi3.o switch.o
|
||||
modsi3.o umodsi3.o udivsi3.o divsi3.o switch.o save_restore_d8_d15.o
|
||||
|
||||
|
||||
# copies any public headers to DSTROOT
|
||||
|
|
Loading…
Reference in New Issue