From 8b1357c1f79c1e1d4b59bb4ff81d600a38350c5b Mon Sep 17 00:00:00 2001
From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Date: Tue, 3 Oct 2023 22:22:35 -0500
Subject: user/{firefox-esr,thunderbird}: Fix x86 asm in avc

Required for binutils-2.41 upgrade.  See patch for details.

Fixes: #1074
---
 user/firefox-esr/BTS-1074.patch | 62 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 user/firefox-esr/BTS-1074.patch

(limited to 'user/firefox-esr/BTS-1074.patch')

diff --git a/user/firefox-esr/BTS-1074.patch b/user/firefox-esr/BTS-1074.patch
new file mode 100644
index 000000000..fdc5478b4
--- /dev/null
+++ b/user/firefox-esr/BTS-1074.patch
@@ -0,0 +1,62 @@
+gas(1) under binutils-2.41 no longer allows invalid negative shifts.
+
+This patch fixes the bundled FFmpeg in Firefox to not use them.
+
+--- a/media/ffvpx/libavcodec/x86/mathops.h.old	2023-10-03 22:15:24.440738743 -0500
++++ b/media/ffvpx/libavcodec/x86/mathops.h	2023-10-03 22:15:41.458911245 -0500
+@@ -35,12 +35,20 @@
+ static av_always_inline av_const int MULL(int a, int b, unsigned shift)
+ {
+     int rt, dummy;
++    if (__builtin_constant_p(shift))
+     __asm__ (
+         "imull %3               \n\t"
+         "shrdl %4, %%edx, %%eax \n\t"
+         :"=a"(rt), "=d"(dummy)
+-        :"a"(a), "rm"(b), "ci"((uint8_t)shift)
++        :"a"(a), "rm"(b), "i"(shift & 0x1F)
+     );
++    else
++        __asm__ (
++            "imull %3               \n\t"
++            "shrdl %4, %%edx, %%eax \n\t"
++            :"=a"(rt), "=d"(dummy)
++            :"a"(a), "rm"(b), "c"((uint8_t)shift)
++        );
+     return rt;
+ }
+ 
+@@ -113,19 +121,31 @@
+ // avoid +32 for shift optimization (gcc should do that ...)
+ #define NEG_SSR32 NEG_SSR32
+ static inline  int32_t NEG_SSR32( int32_t a, int8_t s){
++    if (__builtin_constant_p(s))
+     __asm__ ("sarl %1, %0\n\t"
+          : "+r" (a)
+-         : "ic" ((uint8_t)(-s))
++         : "i" (-s & 0x1F)
+     );
++    else
++        __asm__ ("sarl %1, %0\n\t"
++               : "+r" (a)
++               : "c" ((uint8_t)(-s))
++        );
+     return a;
+ }
+ 
+ #define NEG_USR32 NEG_USR32
+ static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
++    if (__builtin_constant_p(s))
+     __asm__ ("shrl %1, %0\n\t"
+          : "+r" (a)
+-         : "ic" ((uint8_t)(-s))
++         : "i" (-s & 0x1F)
+     );
++    else
++        __asm__ ("shrl %1, %0\n\t"
++               : "+r" (a)
++               : "c" ((uint8_t)(-s))
++        );
+     return a;
+ }
+ 
-- 
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