diff options
| author | jcmvbkbc <jcmvbkbc@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-08-18 01:05:44 +0000 |
|---|---|---|
| committer | jcmvbkbc <jcmvbkbc@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-08-18 01:05:44 +0000 |
| commit | 863356eada6aec2742740b12fae686073dd7e6ca (patch) | |
| tree | 845563e546aa52686bd12c1ff095df50de0a9c06 /libgcc | |
| parent | 85780966029f9c2263a225b534d8a7baf915fb59 (diff) | |
| download | gcc-863356eada6aec2742740b12fae686073dd7e6ca.tar.gz | |
xtensa: reimplement register spilling
Spilling windowed registers in userspace is much easier, more portable,
less error-prone and equally effective as in kernel. Now that register
spilling syscall is considered obsolete in the xtensa linux kernel
replace it with CALL12 followed by series of ENTRY in libgcc.
2015-08-18 Max Filippov <jcmvbkbc@gmail.com>
libgcc/
* config/xtensa/lib2funcs.S (__xtensa_libgcc_window_spill): Use
CALL12 followed by series of ENTRY to spill windowed registers.
(__xtensa_nonlocal_goto): Call __xtensa_libgcc_window_spill
instead of making linux spill syscall.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@226962 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libgcc')
| -rw-r--r-- | libgcc/ChangeLog | 7 | ||||
| -rw-r--r-- | libgcc/config/xtensa/lib2funcs.S | 30 |
2 files changed, 30 insertions, 7 deletions
diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog index 5ce8f7261ee..9b25699aa56 100644 --- a/libgcc/ChangeLog +++ b/libgcc/ChangeLog @@ -1,3 +1,10 @@ +2015-08-18 Max Filippov <jcmvbkbc@gmail.com> + + * config/xtensa/lib2funcs.S (__xtensa_libgcc_window_spill): Use + CALL12 followed by series of ENTRY to spill windowed registers. + (__xtensa_nonlocal_goto): Call __xtensa_libgcc_window_spill + instead of making linux spill syscall. + 2015-08-14 Yuri Rumyantsev <ysrumyan@gmail.com> * config/i386/cpuinfo.c (enum processor_subtypes): Add skylake. diff --git a/libgcc/config/xtensa/lib2funcs.S b/libgcc/config/xtensa/lib2funcs.S index 4d451c8c71c..ef0703f016e 100644 --- a/libgcc/config/xtensa/lib2funcs.S +++ b/libgcc/config/xtensa/lib2funcs.S @@ -34,10 +34,29 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see .global __xtensa_libgcc_window_spill .type __xtensa_libgcc_window_spill,@function __xtensa_libgcc_window_spill: - entry sp, 32 - movi a2, 0 - syscall + entry sp, 48 +#if XCHAL_NUM_AREGS > 16 + call12 1f + retw + .align 4 +1: + .rept (XCHAL_NUM_AREGS - 24) / 12 + _entry sp, 48 + mov a12, a0 + .endr + _entry sp, 16 +#if XCHAL_NUM_AREGS % 12 == 0 + mov a4, a4 +#elif XCHAL_NUM_AREGS % 12 == 4 + mov a8, a8 +#elif XCHAL_NUM_AREGS % 12 == 8 + mov a12, a12 +#endif retw +#else + mov a8, a8 + retw +#endif .size __xtensa_libgcc_window_spill, .-__xtensa_libgcc_window_spill #endif @@ -61,10 +80,7 @@ __xtensa_nonlocal_goto: entry sp, 32 /* Flush registers. */ - mov a5, a2 - movi a2, 0 - syscall - mov a2, a5 + call8 __xtensa_libgcc_window_spill /* Because the save area for a0-a3 is stored one frame below the one identified by a2, the only way to restore those |