commit e4d39b5f7145e8600b1d67fdedc471b6debb879a Author: Nicolas Chauvet <kwizart(a)gmail.com&gt; Date: Mon Dec 11 10:39:33 2017 +0100 Add backported patch for recent binutils on arm neon ...BUS-on-ARM-when-compiled-with-binutils-2..patch | 108 +++++++++++++++++++++ 1 file changed, 108 insertions(+) --- diff --git a/0001-arm-Fix-SIGBUS-on-ARM-when-compiled-with-binutils-2..patch b/0001-arm-Fix-SIGBUS-on-ARM-when-compiled-with-binutils-2..patch new file mode 100644 index 0000000..4440cb2 --- /dev/null +++ b/0001-arm-Fix-SIGBUS-on-ARM-when-compiled-with-binutils-2..patch @@ -0,0 +1,108 @@ +From 9dde6ab06c48f9447cd16f39bee33569cddb7be4 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin(a)martin.st&gt; +Date: Thu, 31 Aug 2017 12:06:44 +0300 +Subject: [PATCH] arm: Fix SIGBUS on ARM when compiled with binutils 2.29 +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +In binutils 2.29, the behavior of the ADR instruction changed so that 1 is +added to the address of a Thumb function (previously nothing was added). This +allows the loaded address to be passed to a BLX instruction and the correct +mode change will occur. + +See: https://sourceware.org/bugzilla/show_bug.cgi?id=21458 + +By using adr with a label that isn't annotated as a thumb function, +we avoid the new behaviour in binutils 2.29 and get the same behaviour +as in prior releases, and as in other assemblers (ms armasm.exe, +clang's built in assembler) - an idea that Janne Grunau came up with. + +Signed-off-by: Martin Storsjö <martin(a)martin.st&gt; +--- + libavcodec/arm/h264idct_neon.S | 20 ++++++++++++-------- + 1 file changed, 12 insertions(+), 8 deletions(-) + +diff --git a/libavcodec/arm/h264idct_neon.S b/libavcodec/arm/h264idct_neon.S +index f588f3e744..b078cf25f9 100644 +--- a/libavcodec/arm/h264idct_neon.S ++++ b/libavcodec/arm/h264idct_neon.S +@@ -21,6 +21,7 @@ + #include "libavutil/arm/asm.S" + + function ff_h264_idct_add_neon, export=1 ++h264_idct_add_neon_nothumb: + vld1.64 {d0-d3}, [r1,:128] + vmov.i16 q15, #0 + +@@ -73,6 +74,7 @@ function ff_h264_idct_add_neon, export=1 + endfunc + + function ff_h264_idct_dc_add_neon, export=1 ++h264_idct_dc_add_neon_nothumb: + mov r3, #0 + vld1.16 {d2[],d3[]}, [r1,:16] + strh r3, [r1] +@@ -113,8 +115,8 @@ function ff_h264_idct_add16_neon, export=1 + movne lr, #0 + cmp lr, #0 + ite ne +- adrne lr, X(ff_h264_idct_dc_add_neon) + CONFIG_THUMB +- adreq lr, X(ff_h264_idct_add_neon) + CONFIG_THUMB ++ adrne lr, h264_idct_dc_add_neon_nothumb + CONFIG_THUMB ++ adreq lr, h264_idct_add_neon_nothumb + CONFIG_THUMB + blx lr + 2: subs ip, ip, #1 + add r1, r1, #32 +@@ -138,8 +140,8 @@ function ff_h264_idct_add16intra_neon, export=1 + cmp r8, #0 + ldrsh r8, [r1] + iteet ne +- adrne lr, X(ff_h264_idct_add_neon) + CONFIG_THUMB +- adreq lr, X(ff_h264_idct_dc_add_neon) + CONFIG_THUMB ++ adrne lr, h264_idct_add_neon_nothumb + CONFIG_THUMB ++ adreq lr, h264_idct_dc_add_neon_nothumb + CONFIG_THUMB + cmpeq r8, #0 + blxne lr + subs ip, ip, #1 +@@ -166,8 +168,8 @@ function ff_h264_idct_add8_neon, export=1 + cmp r8, #0 + ldrsh r8, [r1] + iteet ne +- adrne lr, X(ff_h264_idct_add_neon) + CONFIG_THUMB +- adreq lr, X(ff_h264_idct_dc_add_neon) + CONFIG_THUMB ++ adrne lr, h264_idct_add_neon_nothumb + CONFIG_THUMB ++ adreq lr, h264_idct_dc_add_neon_nothumb + CONFIG_THUMB + cmpeq r8, #0 + blxne lr + add r12, r12, #1 +@@ -267,6 +269,7 @@ endfunc + .endm + + function ff_h264_idct8_add_neon, export=1 ++h264_idct8_add_neon_nothumb: + vmov.i16 q3, #0 + vld1.16 {q8-q9}, [r1,:128] + vst1.16 {q3}, [r1,:128]! +@@ -328,6 +331,7 @@ function ff_h264_idct8_add_neon, export=1 + endfunc + + function ff_h264_idct8_dc_add_neon, export=1 ++h264_idct8_dc_add_neon_nothumb: + mov r3, #0 + vld1.16 {d30[],d31[]},[r1,:16] + strh r3, [r1] +@@ -388,8 +392,8 @@ function ff_h264_idct8_add4_neon, export=1 + movne lr, #0 + cmp lr, #0 + ite ne +- adrne lr, X(ff_h264_idct8_dc_add_neon) + CONFIG_THUMB +- adreq lr, X(ff_h264_idct8_add_neon) + CONFIG_THUMB ++ adrne lr, h264_idct8_dc_add_neon_nothumb + CONFIG_THUMB ++ adreq lr, h264_idct8_add_neon_nothumb + CONFIG_THUMB + blx lr + 2: subs r12, r12, #4 + add r1, r1, #128 +-- +2.13.6 +