diff options
Diffstat (limited to 'packages/gcc/5.5.0/0015-xtensa-reimplement-register-spilling.patch')
| -rw-r--r-- | packages/gcc/5.5.0/0015-xtensa-reimplement-register-spilling.patch | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/packages/gcc/5.5.0/0015-xtensa-reimplement-register-spilling.patch b/packages/gcc/5.5.0/0015-xtensa-reimplement-register-spilling.patch new file mode 100644 index 0000000..b85ecb9 --- /dev/null +++ b/packages/gcc/5.5.0/0015-xtensa-reimplement-register-spilling.patch @@ -0,0 +1,71 @@ +From 40507bf199440082ed69b777986d50c31efe2520 Mon Sep 17 00:00:00 2001 +From: Max Filippov <jcmvbkbc@gmail.com> +Date: Mon, 10 Aug 2015 21:35:20 +0300 +Subject: [PATCH 1/3] 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. + +Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> +--- +Backported from: r226962 + + libgcc/config/xtensa/lib2funcs.S | 30 +++++++++++++++++++++++------- + 1 file changed, 23 insertions(+), 7 deletions(-) + +--- a/libgcc/config/xtensa/lib2funcs.S ++++ b/libgcc/config/xtensa/lib2funcs.S +@@ -34,10 +34,29 @@ + .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 @@ + 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 |