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