]>
Commit | Line | Data |
---|---|---|
1a4d82fc JJ |
1 | //===-- save_restore_regs.S - Implement save/restore* ---------------------===// |
2 | // | |
3 | // The LLVM Compiler Infrastructure | |
4 | // | |
5 | // This file is dual licensed under the MIT and the University of Illinois Open | |
6 | // Source Licenses. See LICENSE.TXT for details. | |
7 | // | |
8 | //===----------------------------------------------------------------------===// | |
9 | ||
10 | #include "../assembly.h" | |
11 | ||
12 | // | |
13 | // When compiling C++ functions that need to handle thrown exceptions the | |
14 | // compiler is required to save all registers and call __Unwind_SjLj_Register | |
15 | // in the function prolog. But when compiling for thumb1, there are | |
16 | // no instructions to access the floating point registers, so the | |
17 | // compiler needs to add a call to the helper function _save_vfp_d8_d15_regs | |
18 | // written in ARM to save the float registers. In the epilog, the compiler | |
19 | // must also add a call to __restore_vfp_d8_d15_regs to restore those registers. | |
20 | // | |
21 | ||
22 | .text | |
23 | .syntax unified | |
24 | ||
25 | // | |
26 | // Save registers d8-d15 onto stack | |
27 | // | |
92a42be0 | 28 | .p2align 2 |
1a4d82fc JJ |
29 | DEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs) |
30 | vstmdb sp!, {d8-d15} // push registers d8-d15 onto stack | |
31 | bx lr // return to prolog | |
32 | END_COMPILERRT_FUNCTION(__save_vfp_d8_d15_regs) | |
33 |