Update to musl 1.2.1. (#222)

See the WHATSNEW file for details. WASI libc currently uses a separate
malloc, so the new mallocng is not currently used.

This includes a few new custom changes to disable code for handling
directed rounding modes. Wasm doesn't have directed rounding modes,
so disabling this code size saves code size, something the WASI libc
project cares about!

expected/wasm32-wasi/defined-symbols.txt

@@ -218,7 +218,6 @@ __strcoll_l
 __strerror_l
 __strftime_fmt_1
 __strftime_l
-__string_read
 __strncasecmp_l
 __strtoimax_internal
 __strtol_internal

libc-top-half/musl/COPYRIGHT

@@ -127,10 +127,13 @@ Copyright © 2017-2018 Arm Limited
 and labelled as such in comments in the individual source files. All
 have been licensed under extremely permissive terms.
 
-The ARM memcpy code (src/string/arm/memcpy_el.S) is Copyright © 2008
+The ARM memcpy code (src/string/arm/memcpy.S) is Copyright © 2008
 The Android Open Source Project and is licensed under a two-clause BSD
 license. It was taken from Bionic libc, used on Android.
 
+The AArch64 memcpy and memset code (src/string/aarch64/*) are
+Copyright © 1999-2019, Arm Limited.
+
 The implementation of DES for crypt (src/crypt/crypt_des.c) is
 Copyright © 1994 David Burren. It is licensed under a BSD license.
 

libc-top-half/musl/Makefile

@@ -17,7 +17,8 @@ includedir = $(prefix)/include
 libdir = $(prefix)/lib
 syslibdir = /lib
 
-SRC_DIRS = $(addprefix $(srcdir)/,src/* crt ldso $(COMPAT_SRC_DIRS))
+MALLOC_DIR = mallocng
+SRC_DIRS = $(addprefix $(srcdir)/,src/* src/malloc/$(MALLOC_DIR) crt ldso $(COMPAT_SRC_DIRS))
 BASE_GLOBS = $(addsuffix /*.c,$(SRC_DIRS))
 ARCH_GLOBS = $(addsuffix /$(ARCH)/*.[csS],$(SRC_DIRS))
 BASE_SRCS = $(sort $(wildcard $(BASE_GLOBS)))

libc-top-half/musl/VERSION

@@ -1 +1 @@
-1.2.0
+1.2.1

libc-top-half/musl/WHATSNEW

@@ -2200,3 +2200,39 @@ arch-specific bugs fixed:
 - arm dynamic linker chose wrong tls/atomic variants since 1.1.21
 - some math library functions returned excess precision on i386
 - unconfirmed regression in fchmodat AT_SYMLINK_NOFOLLOW on mips*
+
+
+
+1.2.1 release notes
+
+major changes:
+- new malloc implementation (mallocng & overhauled bump allocator)
+
+new features:
+- DNS queries via res_* now set AD flag, report zone signedness (DNSSEC)
+- PTHREAD_NULL macro (POSIX-future)
+
+performance:
+- optimized memcpy and memset for aarch64
+- optimized memcpy for arm now supports big endian
+- optimized x86_64 remquol
+- improved strerror without linear search
+
+bugs fixed:
+- lock-skipping for processes that returned to single-threaded was wrong
+- AF_UNSPEC dns lookups mishandled single failure in paired A+AAAA
+- res_send and res_query returned wrong value on errors from nameserver
+- corrupted sysvipc timestamps on 32-bit archs with old kernels
+- incorrect parsing of timezone offsets after overly-long zone name
+- clock_adjtime was broken on 32-bit archs (time64)
+- pthread_kill as not async-signal-safe
+- pthread_cancel was not async-cancel-safe
+- large-ulp errors in various math functions in non-default rounding modes
+
+arch-specific bugs fixed:
+- arm clock_gettime was broken on some hw due to bad time64 vdso
+- m68k sqrtl lacked long double precision
+- mips* syscall mechanism regressions on older kernels
+- mips* had negated error codes for some syscalls (kernel bug)
+- mips* SIGEMT was wrongly called SIGSTKFLT
+- sh fesetround didn't work correctly on sh

libc-top-half/musl/arch/arm/syscall_arch.h

@@ -98,12 +98,6 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
 	__asm_syscall(R7_OPERAND, "0"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r5));
 }
 
-#define VDSO_USEFUL
-#define VDSO_CGT32_SYM "__vdso_clock_gettime"
-#define VDSO_CGT32_VER "LINUX_2.6"
-#define VDSO_CGT_SYM "__vdso_clock_gettime64"
-#define VDSO_CGT_VER "LINUX_2.6"
-
 #define SYSCALL_FADVISE_6_ARG
 
 #define SYSCALL_IPC_BROKEN_MODE

libc-top-half/musl/arch/mips/bits/signal.h

@@ -93,7 +93,7 @@ typedef struct __ucontext {
 #define SIGTRAP   5
 #define SIGABRT   6
 #define SIGIOT    SIGABRT
-#define SIGSTKFLT 7
+#define SIGEMT    7
 #define SIGFPE    8
 #define SIGKILL   9
 #define SIGBUS    10

libc-top-half/musl/arch/mips/syscall_arch.h

@@ -18,40 +18,40 @@
 static inline long __syscall0(long n)
 {
 	register long r7 __asm__("$7");
-	register long r2 __asm__("$2") = n;
+	register long r2 __asm__("$2");
 	__asm__ __volatile__ (
-		"syscall"
-		: "+r"(r2), "=r"(r7)
-		:
+		"addu $2,$0,%2 ; syscall"
+		: "=&r"(r2), "=r"(r7)
+		: "ir"(n), "0"(r2)
 		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
-	return r7 ? -r2 : r2;
+	return r7 && r2>0 ? -r2 : r2;
 }
 
 static inline long __syscall1(long n, long a)
 {
 	register long r4 __asm__("$4") = a;
 	register long r7 __asm__("$7");
-	register long r2 __asm__("$2") = n;
+	register long r2 __asm__("$2");
 	__asm__ __volatile__ (
-		"syscall"
-		: "+r"(r2), "=r"(r7)
-		: "r"(r4)
+		"addu $2,$0,%2 ; syscall"
+		: "=&r"(r2), "=r"(r7)
+		: "ir"(n), "0"(r2), "r"(r4)
 		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
-	return r7 ? -r2 : r2;
+	return r7 && r2>0 ? -r2 : r2;
 }
 
 static inline long __syscall2(long n, long a, long b)
 {
 	register long r4 __asm__("$4") = a;
 	register long r5 __asm__("$5") = b;
 	register long r7 __asm__("$7");
-	register long r2 __asm__("$2") = n;
+	register long r2 __asm__("$2");
 	__asm__ __volatile__ (
-		"syscall"
-		: "+r"(r2), "=r"(r7)
-		: "r"(r4), "r"(r5)
+		"addu $2,$0,%2 ; syscall"
+		: "=&r"(r2), "=r"(r7)
+		: "ir"(n), "0"(r2), "r"(r4), "r"(r5)
 		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
-	return r7 ? -r2 : r2;
+	return r7 && r2>0 ? -r2 : r2;
 }
 
 static inline long __syscall3(long n, long a, long b, long c)
@@ -60,13 +60,13 @@ static inline long __syscall3(long n, long a, long b, long c)
 	register long r5 __asm__("$5") = b;
 	register long r6 __asm__("$6") = c;
 	register long r7 __asm__("$7");
-	register long r2 __asm__("$2") = n;
+	register long r2 __asm__("$2");
 	__asm__ __volatile__ (
-		"syscall"
-		: "+r"(r2), "=r"(r7)
-		: "r"(r4), "r"(r5), "r"(r6)
+		"addu $2,$0,%2 ; syscall"
+		: "=&r"(r2), "=r"(r7)
+		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
 		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
-	return r7 ? -r2 : r2;
+	return r7 && r2>0 ? -r2 : r2;
 }
 
 static inline long __syscall4(long n, long a, long b, long c, long d)
@@ -75,13 +75,13 @@ static inline long __syscall4(long n, long a, long b, long c, long d)
 	register long r5 __asm__("$5") = b;
 	register long r6 __asm__("$6") = c;
 	register long r7 __asm__("$7") = d;
-	register long r2 __asm__("$2") = n;
+	register long r2 __asm__("$2");
 	__asm__ __volatile__ (
-		"syscall"
-		: "+r"(r2), "+r"(r7)
-		: "r"(r4), "r"(r5), "r"(r6)
+		"addu $2,$0,%2 ; syscall"
+		: "=&r"(r2), "+r"(r7)
+		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
 		: SYSCALL_CLOBBERLIST, "$8", "$9", "$10");
-	return r7 ? -r2 : r2;
+	return r7 && r2>0 ? -r2 : r2;
 }
 
 static inline long __syscall5(long n, long a, long b, long c, long d, long e)
@@ -91,15 +91,15 @@ static inline long __syscall5(long n, long a, long b, long c, long d, long e)
 	register long r6 __asm__("$6") = c;
 	register long r7 __asm__("$7") = d;
 	register long r8 __asm__("$8") = e;
-	register long r2 __asm__("$2") = n;
+	register long r2 __asm__("$2");
 	__asm__ __volatile__ (
 		"subu $sp,$sp,32 ; sw $8,16($sp) ; "
-		"syscall ;"
+		"addu $2,$0,%3 ; syscall ;"
 		"addu $sp,$sp,32"
-		: "+r"(r2), "+r"(r7), "+r"(r8)
-		: "r"(r4), "r"(r5), "r"(r6)
+		: "=&r"(r2), "+r"(r7), "+r"(r8)
+		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
 		: SYSCALL_CLOBBERLIST, "$9", "$10");
-	return r7 ? -r2 : r2;
+	return r7 && r2>0 ? -r2 : r2;
 }
 
 static inline long __syscall6(long n, long a, long b, long c, long d, long e, long f)
@@ -110,15 +110,15 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
 	register long r7 __asm__("$7") = d;
 	register long r8 __asm__("$8") = e;
 	register long r9 __asm__("$9") = f;
-	register long r2 __asm__("$2") = n;
+	register long r2 __asm__("$2");
 	__asm__ __volatile__ (
 		"subu $sp,$sp,32 ; sw $8,16($sp) ; sw $9,20($sp) ; "
-		"syscall ;"
+		"addu $2,$0,%4 ; syscall ;"
 		"addu $sp,$sp,32"
-		: "+r"(r2), "+r"(r7), "+r"(r8), "+r"(r9)
-		: "r"(r4), "r"(r5), "r"(r6)
+		: "=&r"(r2), "+r"(r7), "+r"(r8), "+r"(r9)
+		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
 		: SYSCALL_CLOBBERLIST, "$10");
-	return r7 ? -r2 : r2;
+	return r7 && r2>0 ? -r2 : r2;
 }
 
 static inline long __syscall7(long n, long a, long b, long c, long d, long e, long f, long g)
@@ -130,15 +130,15 @@ static inline long __syscall7(long n, long a, long b, long c, long d, long e, lo
 	register long r8 __asm__("$8") = e;
 	register long r9 __asm__("$9") = f;
 	register long r10 __asm__("$10") = g;
-	register long r2 __asm__("$2") = n;
+	register long r2 __asm__("$2");
 	__asm__ __volatile__ (
 		"subu $sp,$sp,32 ; sw $8,16($sp) ; sw $9,20($sp) ; sw $10,24($sp) ; "
-		"syscall ;"
+		"addu $2,$0,%5 ; syscall ;"
 		"addu $sp,$sp,32"
-		: "+r"(r2), "+r"(r7), "+r"(r8), "+r"(r9), "+r"(r10)
-		: "r"(r4), "r"(r5), "r"(r6)
+		: "=&r"(r2), "+r"(r7), "+r"(r8), "+r"(r9), "+r"(r10)
+		: "ir"(n), "0"(r2), "r"(r4), "r"(r5), "r"(r6)
 		: SYSCALL_CLOBBERLIST);
-	return r7 ? -r2 : r2;
+	return r7 && r2>0 ? -r2 : r2;
 }
 
 #define VDSO_USEFUL

libc-top-half/musl/arch/mips64/bits/signal.h

@@ -112,7 +112,7 @@ typedef struct __ucontext {
 #define SIGTRAP   5
 #define SIGABRT   6
 #define SIGIOT    SIGABRT
-#define SIGSTKFLT 7
+#define SIGEMT    7
 #define SIGFPE    8
 #define SIGKILL   9
 #define SIGBUS    10