From 40e77dad836abf130bf49af1838d108f0fc2e94e Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Wed, 25 Sep 2019 15:15:52 -0400
Subject: [PATCH] musl [PATCH] arm: fix setjmp and longjmp asm for armv8-a

From: Szabolcs Nagy <szabolcs.nagy@arm.com>

armv8 removed the coprocessor instructions other than cp14, so
on an armv8 system the related hwcaps should never be set.

new llvm complains about the use of coprocessor instructions in
armv8-a mode (even though they are never executed at runtime),
so ifdef them out when musl is built for armv8.

<dalias> i think the patch looks ok
---
 lib/libc/musl/src/setjmp/arm/{longjmp.s => longjmp.S} | 7 +++++++
 lib/libc/musl/src/setjmp/arm/{setjmp.s => setjmp.S}   | 7 +++++++
 src/install_files.h                                   | 4 ++--
 3 files changed, 16 insertions(+), 2 deletions(-)
 rename lib/libc/musl/src/setjmp/arm/{longjmp.s => longjmp.S} (87%)
 rename lib/libc/musl/src/setjmp/arm/{setjmp.s => setjmp.S} (88%)

diff --git a/lib/libc/musl/src/setjmp/arm/longjmp.s b/lib/libc/musl/src/setjmp/arm/longjmp.S
similarity index 87%
rename from lib/libc/musl/src/setjmp/arm/longjmp.s
rename to lib/libc/musl/src/setjmp/arm/longjmp.S
index 76cc2920a3..8df0b8190d 100644
--- a/lib/libc/musl/src/setjmp/arm/longjmp.s
+++ b/lib/libc/musl/src/setjmp/arm/longjmp.S
@@ -16,11 +16,14 @@ longjmp:
 	ldr r2,1f
 	ldr r1,[r1,r2]
 
+#if __ARM_ARCH < 8
 	tst r1,#0x260
 	beq 3f
+	// HWCAP_ARM_FPA
 	tst r1,#0x20
 	beq 2f
 	ldc p2, cr4, [ip], #48
+#endif
 2:	tst r1,#0x40
 	beq 2f
 	.fpu vfp
@@ -28,6 +31,8 @@ longjmp:
 	.fpu softvfp
 	.eabi_attribute 10, 0
 	.eabi_attribute 27, 0
+#if __ARM_ARCH < 8
+	// HWCAP_ARM_IWMMXT
 2:	tst r1,#0x200
 	beq 3f
 	ldcl p1, cr10, [ip], #8
@@ -36,6 +41,8 @@ longjmp:
 	ldcl p1, cr13, [ip], #8
 	ldcl p1, cr14, [ip], #8
 	ldcl p1, cr15, [ip], #8
+#endif
+2:
 3:	bx lr
 
 .hidden __hwcap
diff --git a/lib/libc/musl/src/setjmp/arm/setjmp.s b/lib/libc/musl/src/setjmp/arm/setjmp.S
similarity index 88%
rename from lib/libc/musl/src/setjmp/arm/setjmp.s
rename to lib/libc/musl/src/setjmp/arm/setjmp.S
index 011315b70f..45731d228e 100644
--- a/lib/libc/musl/src/setjmp/arm/setjmp.s
+++ b/lib/libc/musl/src/setjmp/arm/setjmp.S
@@ -18,11 +18,14 @@ setjmp:
 	ldr r2,1f
 	ldr r1,[r1,r2]
 
+#if __ARM_ARCH < 8
 	tst r1,#0x260
 	beq 3f
+	// HWCAP_ARM_FPA
 	tst r1,#0x20
 	beq 2f
 	stc p2, cr4, [ip], #48
+#endif
 2:	tst r1,#0x40
 	beq 2f
 	.fpu vfp
@@ -30,6 +33,8 @@ setjmp:
 	.fpu softvfp
 	.eabi_attribute 10, 0
 	.eabi_attribute 27, 0
+#if __ARM_ARCH < 8
+	// HWCAP_ARM_IWMMXT
 2:	tst r1,#0x200
 	beq 3f
 	stcl p1, cr10, [ip], #8
@@ -38,6 +43,8 @@ setjmp:
 	stcl p1, cr13, [ip], #8
 	stcl p1, cr14, [ip], #8
 	stcl p1, cr15, [ip], #8
+#endif
+2:
 3:	bx lr
 
 .hidden __hwcap
diff --git a/src/install_files.h b/src/install_files.h
index 138d0f5278..5e89c07b54 100644
--- a/src/install_files.h
+++ b/src/install_files.h
@@ -1155,8 +1155,8 @@ static const char *ZIG_MUSL_SRC_FILES[] = {
 "musl/src/select/select.c",
 "musl/src/setjmp/aarch64/longjmp.s",
 "musl/src/setjmp/aarch64/setjmp.s",
-"musl/src/setjmp/arm/longjmp.s",
-"musl/src/setjmp/arm/setjmp.s",
+"musl/src/setjmp/arm/longjmp.S",
+"musl/src/setjmp/arm/setjmp.S",
 "musl/src/setjmp/i386/longjmp.s",
 "musl/src/setjmp/i386/setjmp.s",
 "musl/src/setjmp/longjmp.c",