musl: Add risc-v port

This will be merged soon, but lets try it out from fork
and ensure all testing is done for upstreaming

Signed-off-by: Khem Raj <raj.khem@gmail.com>

recipes-core/musl/musl/0002-RISC-V-Add-cache-flush-syscall.patch

@@ -0,0 +1,51 @@
+From d471b10ce2abe4f3dfec6d24ad0f8ef1fe1070b3 Mon Sep 17 00:00:00 2001
+From: Drew DeVault <sir@cmpwn.com>
+Date: Sun, 16 Dec 2018 10:55:09 -0500
+Subject: [PATCH 2/5] RISC-V: Add cache flush syscall
+
+---
+ arch/riscv32/bits/syscall.h.in | 1 +
+ arch/riscv64/bits/syscall.h.in | 1 +
+ src/linux/cache.c              | 9 +++++++++
+ 3 files changed, 11 insertions(+)
+
+diff --git a/arch/riscv32/bits/syscall.h.in b/arch/riscv32/bits/syscall.h.in
+index 3c81c107..11393c29 100644
+--- a/arch/riscv32/bits/syscall.h.in
++++ b/arch/riscv32/bits/syscall.h.in
+@@ -275,4 +275,5 @@
+ #define __NR_pkey_alloc 289
+ #define __NR_pkey_free 290
+ #define __NR_sysriscv __NR_arch_specific_syscall
++#define __NR_riscv_flush_icache (__NR_sysriscv + 15)
+ 
+diff --git a/arch/riscv64/bits/syscall.h.in b/arch/riscv64/bits/syscall.h.in
+index 3c81c107..11393c29 100644
+--- a/arch/riscv64/bits/syscall.h.in
++++ b/arch/riscv64/bits/syscall.h.in
+@@ -275,4 +275,5 @@
+ #define __NR_pkey_alloc 289
+ #define __NR_pkey_free 290
+ #define __NR_sysriscv __NR_arch_specific_syscall
++#define __NR_riscv_flush_icache (__NR_sysriscv + 15)
+ 
+diff --git a/src/linux/cache.c b/src/linux/cache.c
+index 84a138a4..4ce919cf 100644
+--- a/src/linux/cache.c
++++ b/src/linux/cache.c
+@@ -15,3 +15,12 @@ int __cachectl(void *addr, int len, int op)
+ }
+ weak_alias(__cachectl, cachectl);
+ #endif
++
++#ifdef SYS_riscv_flush_icache
++int __riscv_flush_icache(void *start, void *end, unsigned long int flags) 
++{
++	// TODO: Use vdso
++	return syscall(SYS_riscv_flush_icache, start, end, flags);
++}
++weak_alias(__riscv_flush_icache, riscv_flush_icache);
++#endif
+-- 
+2.20.1
+

recipes-core/musl/musl/0003-RISC-V-Fix-syscall_cp-on-riscv64-32.patch

@@ -0,0 +1,53 @@
+From e257365645012bc47a4273eeb2224451b656a3ad Mon Sep 17 00:00:00 2001
+From: Drew DeVault <sir@cmpwn.com>
+Date: Fri, 14 Dec 2018 20:32:12 -0500
+Subject: [PATCH 3/5] RISC-V: Fix syscall_cp on riscv64/32
+
+Thanks to Rich Felker for pointing out this error on the musl list. In
+addition to fixing the labels, this loads the cancel flag with lw
+instead of ld.
+---
+ src/thread/riscv32/syscall_cp.s | 4 ++--
+ src/thread/riscv64/syscall_cp.s | 6 +++---
+ 2 files changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/src/thread/riscv32/syscall_cp.s b/src/thread/riscv32/syscall_cp.s
+index 71bf6d3e..9c450402 100644
+--- a/src/thread/riscv32/syscall_cp.s
++++ b/src/thread/riscv32/syscall_cp.s
+@@ -23,7 +23,7 @@ __cp_begin:
+         lw a6, 0(sp)
+         mv a7, t0
+         scall
+-__cp_cancel:
+-        ret
+ __cp_end:
++        ret
++__cp_cancel:
+         j __cancel
+diff --git a/src/thread/riscv64/syscall_cp.s b/src/thread/riscv64/syscall_cp.s
+index c745b328..65cf722f 100644
+--- a/src/thread/riscv64/syscall_cp.s
++++ b/src/thread/riscv64/syscall_cp.s
+@@ -10,7 +10,7 @@
+ .type __syscall_cp_asm, %function
+ __syscall_cp_asm:
+ __cp_begin:
+-        ld t0, 0(a0)
++        lw t0, 0(a0)
+         bnez t0, __cp_cancel
+ 
+         mv t0, a1
+@@ -23,7 +23,7 @@ __cp_begin:
+         ld a6, 0(sp)
+         mv a7, t0
+         scall
+-__cp_cancel:
+-        ret
+ __cp_end:
++        ret
++__cp_cancel:
+         j __cancel
+-- 
+2.20.1
+

recipes-core/musl/musl/0004-Use-the-generic-fcntl.h-header-Currently-the-fcntl.h.patch

@@ -0,0 +1,104 @@
+From fc003fe211ae03e911c0a4d1f823788bbbce1900 Mon Sep 17 00:00:00 2001
+From: Nick Kossifidis <mickflemm@gmail.com>
+Date: Mon, 29 Oct 2018 12:36:18 +0200
+Subject: [PATCH 4/5] Use the generic fcntl.h header Currently the fcntl.h
+
+header uses different macros from those on upstream Linux. On upstream Linux there is no arch-specific fcntl.h, the generic one is used. As a result various syscalls using these macros fail, an example being BusyBox where any call to opendir() will fail because O_DIRECTORY id is different between the headers used here (probably coming from arm64) and the generic headers used by the kernel. Simple delete the arch-specific fcntl.h and let musl use the generic header as well.
+---
+ arch/riscv32/bits/fcntl.h | 38 --------------------------------------
+ arch/riscv64/bits/fcntl.h | 38 --------------------------------------
+ 2 files changed, 76 deletions(-)
+ delete mode 100644 arch/riscv32/bits/fcntl.h
+ delete mode 100644 arch/riscv64/bits/fcntl.h
+
+diff --git a/arch/riscv32/bits/fcntl.h b/arch/riscv32/bits/fcntl.h
+deleted file mode 100644
+index 92787976..00000000
+--- a/arch/riscv32/bits/fcntl.h
++++ /dev/null
+@@ -1,38 +0,0 @@
+-#define O_CREAT        0100
+-#define O_EXCL         0200
+-#define O_NOCTTY       0400
+-#define O_TRUNC       01000
+-#define O_APPEND      02000
+-#define O_NONBLOCK    04000
+-#define O_DSYNC      010000
+-#define O_SYNC     04010000
+-#define O_RSYNC    04010000
+-#define O_DIRECTORY  040000
+-#define O_NOFOLLOW  0100000
+-#define O_CLOEXEC  02000000
+-
+-#define O_ASYNC      020000
+-#define O_DIRECT    0200000
+-#define O_LARGEFILE 0400000
+-#define O_NOATIME  01000000
+-#define O_PATH    010000000
+-#define O_TMPFILE 020040000
+-#define O_NDELAY O_NONBLOCK
+-
+-#define F_DUPFD  0
+-#define F_GETFD  1
+-#define F_SETFD  2
+-#define F_GETFL  3
+-#define F_SETFL  4
+-#define F_GETLK  5
+-#define F_SETLK  6
+-#define F_SETLKW 7
+-#define F_SETOWN 8
+-#define F_GETOWN 9
+-#define F_SETSIG 10
+-#define F_GETSIG 11
+-
+-#define F_SETOWN_EX 15
+-#define F_GETOWN_EX 16
+-
+-#define F_GETOWNER_UIDS 17
+diff --git a/arch/riscv64/bits/fcntl.h b/arch/riscv64/bits/fcntl.h
+deleted file mode 100644
+index 92787976..00000000
+--- a/arch/riscv64/bits/fcntl.h
++++ /dev/null
+@@ -1,38 +0,0 @@
+-#define O_CREAT        0100
+-#define O_EXCL         0200
+-#define O_NOCTTY       0400
+-#define O_TRUNC       01000
+-#define O_APPEND      02000
+-#define O_NONBLOCK    04000
+-#define O_DSYNC      010000
+-#define O_SYNC     04010000
+-#define O_RSYNC    04010000
+-#define O_DIRECTORY  040000
+-#define O_NOFOLLOW  0100000
+-#define O_CLOEXEC  02000000
+-
+-#define O_ASYNC      020000
+-#define O_DIRECT    0200000
+-#define O_LARGEFILE 0400000
+-#define O_NOATIME  01000000
+-#define O_PATH    010000000
+-#define O_TMPFILE 020040000
+-#define O_NDELAY O_NONBLOCK
+-
+-#define F_DUPFD  0
+-#define F_GETFD  1
+-#define F_SETFD  2
+-#define F_GETFL  3
+-#define F_SETFL  4
+-#define F_GETLK  5
+-#define F_SETLK  6
+-#define F_SETLKW 7
+-#define F_SETOWN 8
+-#define F_GETOWN 9
+-#define F_SETSIG 10
+-#define F_GETSIG 11
+-
+-#define F_SETOWN_EX 15
+-#define F_GETOWN_EX 16
+-
+-#define F_GETOWNER_UIDS 17
+-- 
+2.20.1
+

recipes-core/musl/musl/0005-Fix-missing-macros-from-fcntl.h.patch

@@ -0,0 +1,56 @@
+From 6731272acf55de3bb82d186c0c7690211feb064a Mon Sep 17 00:00:00 2001
+From: Nick Kossifidis <mickflemm@gmail.com>
+Date: Sun, 4 Nov 2018 20:38:48 +0200
+Subject: [PATCH 5/5] Fix missing macros from fcntl.h
+
+This fixes file locking, tested with busybox
+---
+ arch/generic/bits/fcntl.h | 10 ++++++----
+ include/fcntl.h           |  2 ++
+ 2 files changed, 8 insertions(+), 4 deletions(-)
+
+diff --git a/arch/generic/bits/fcntl.h b/arch/generic/bits/fcntl.h
+index ae233cc0..d9e779a6 100644
+--- a/arch/generic/bits/fcntl.h
++++ b/arch/generic/bits/fcntl.h
+@@ -24,15 +24,17 @@
+ #define F_SETFD  2
+ #define F_GETFL  3
+ #define F_SETFL  4
+-
++#define F_GETLK  5
++#define F_SETLK  6
++#define F_SETLKW 7
+ #define F_SETOWN 8
+ #define F_GETOWN 9
+ #define F_SETSIG 10
+ #define F_GETSIG 11
+ 
+-#define F_GETLK 12
+-#define F_SETLK 13
+-#define F_SETLKW 14
++#define F_GETLK64 12
++#define F_SETLK64 13
++#define F_SETLKW64 14
+ 
+ #define F_SETOWN_EX 15
+ #define F_GETOWN_EX 16
+diff --git a/include/fcntl.h b/include/fcntl.h
+index 4d91338b..c34de91f 100644
+--- a/include/fcntl.h
++++ b/include/fcntl.h
+@@ -187,9 +187,11 @@ ssize_t tee(int, int, size_t, unsigned);
+ #endif
+ 
+ #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
++#ifndef F_GETLK64
+ #define F_GETLK64 F_GETLK
+ #define F_SETLK64 F_SETLK
+ #define F_SETLKW64 F_SETLKW
++#endif
+ #define flock64 flock
+ #define open64 open
+ #define openat64 openat
+-- 
+2.20.1
+

recipes-core/musl/musl_%.bbappend

@@ -0,0 +1,12 @@
+# Copyright (C) 2019 Khem Raj <raj.khem@gmail.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += "\
+            file://0001-RISC-V-add-riscv32-and-riscv64-architecture-support.patch \
+            file://0002-RISC-V-Add-cache-flush-syscall.patch \
+            file://0003-RISC-V-Fix-syscall_cp-on-riscv64-32.patch \
+            file://0004-Use-the-generic-fcntl.h-header-Currently-the-fcntl.h.patch \
+            file://0005-Fix-missing-macros-from-fcntl.h.patch \
+"