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author | kozyilmaz <kazim@monolytic.com> | 2016-08-24 08:33:24 (GMT) |
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committer | kozyilmaz <kazim@monolytic.com> | 2016-08-24 08:33:24 (GMT) |
commit | deaa4b8ded066f0b32b4d6be28756d2d7d68d7d6 (patch) | |
tree | e58f6f9b0bb442cf1b50b301bc73f7a1946724f2 /patches/gcc/5.4.0/871-xtensa-reimplement-register-spilling.patch | |
parent | 11cb2ddd43fd1ff493f4b7cd63f1cf654294165f (diff) |
xgcc: Update gcc 5 to 5.4.0
patches synced with buildroot trunk and:
110-xtensa-implement-trap-pattern.patch (copied to 5.4.0 patches)
130-build_gcc-5_with_gcc-6.patch (upstreamed in 5.4.0, dropped)
370-gcc-plugin-Win-Dont-need-undefined-extern-var-refs-nor-fpic.patch (copied to 5.4.0 patches)
380-gcc-plugin-POSIX-include-sys-select-h.patch (copied to 5.4.0 patches)
910-nios2-bad-multilib-default.patch (copied to 5.4.0 patches)
Diffstat (limited to 'patches/gcc/5.4.0/871-xtensa-reimplement-register-spilling.patch')
-rw-r--r-- | patches/gcc/5.4.0/871-xtensa-reimplement-register-spilling.patch | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/patches/gcc/5.4.0/871-xtensa-reimplement-register-spilling.patch b/patches/gcc/5.4.0/871-xtensa-reimplement-register-spilling.patch new file mode 100644 index 0000000..4056f8b --- /dev/null +++ b/patches/gcc/5.4.0/871-xtensa-reimplement-register-spilling.patch @@ -0,0 +1,76 @@ +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(-) + +diff --git a/libgcc/config/xtensa/lib2funcs.S b/libgcc/config/xtensa/lib2funcs.S +index 4d451c8..ef0703f 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 +-- +1.8.1.4 + |