From a6c649571d49c972e6d207577780ada7e9b6bad5 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Tue, 8 Dec 2015 08:31:52 +0000
Subject: [PATCH 45/57] Support for arm-linux-musl.

Fix musl ldso for all arches

Upstream-Status: backport [partial]
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
 gcc/config/aarch64/aarch64-linux.h |  1 +
 gcc/config/arm/linux-eabi.h        | 17 +++++++++++++++++
 gcc/config/i386/linux.h            |  1 +
 gcc/config/i386/linux64.h          |  5 +++++
 gcc/config/mips/linux.h            |  8 +++++++-
 gcc/config/rs6000/linux64.h        | 13 +++++++++----
 gcc/config/rs6000/sysv4.h          | 10 +++++++---
 libitm/config/arm/hwcap.cc         |  4 ++++
 libitm/config/linux/x86/tls.h      |  8 ++++++--
 9 files changed, 57 insertions(+), 10 deletions(-)

diff --git a/gcc/config/aarch64/aarch64-linux.h b/gcc/config/aarch64/aarch64-linux.h
index f9e65fc..1b2d0c0 100644
--- a/gcc/config/aarch64/aarch64-linux.h
+++ b/gcc/config/aarch64/aarch64-linux.h
@@ -22,6 +22,7 @@
 #define GCC_AARCH64_LINUX_H
 
 #define GLIBC_DYNAMIC_LINKER  SYSTEMLIBS_DIR "ld-linux-aarch64%{mbig-endian:_be}%{mabi=ilp32:_ilp32}.so.1"
+#define MUSL_DYNAMIC_LINKER  SYSTEMLIBS_DIR "ld-musl-aarch64.so.1"
 
 #define MUSL_DYNAMIC_LINKER  SYSTEMLIBS_DIR "ld-musl-aarch64.so.1"
 
diff --git a/gcc/config/arm/linux-eabi.h b/gcc/config/arm/linux-eabi.h
index 048a062..adb9c44 100644
--- a/gcc/config/arm/linux-eabi.h
+++ b/gcc/config/arm/linux-eabi.h
@@ -81,6 +81,23 @@
 #undef TARGET_FIX_V4BX_SPEC
 #define TARGET_FIX_V4BX_SPEC "%{mcpu=arm8|mcpu=arm810|mcpu=strongarm*|march=armv4: --fix-v4bx}"
 
+/* For ARM musl currently supports four dynamic linkers:
+   - ld-musl-arm.so.1 - for the EABI-derived soft-float ABI
+   - ld-musl-armhf.so.1 - for the EABI-derived hard-float ABI
+   - ld-musl-armeb.so.1 - for the EABI-derived soft-float ABI, EB
+   - ld-musl-armebhf.so.1 - for the EABI-derived hard-float ABI, EB
+   musl does not support the legacy OABI mode.
+   All the dynamic linkers live in /lib.
+   We default to soft-float, EL. */
+#undef  MUSL_DYNAMIC_LINKER
+#if TARGET_BIG_ENDIAN_DEFAULT
+#define MUSL_DYNAMIC_LINKER_E "%{mlittle-endian:;:eb}"
+#else
+#define MUSL_DYNAMIC_LINKER_E "%{mbig-endian:eb}"
+#endif
+#define MUSL_DYNAMIC_LINKER \
+  SYSTEMLIBS_DIR "ld-musl-arm" MUSL_DYNAMIC_LINKER_E "%{mfloat-abi=hard:hf}.so.1"
+
 /* At this point, bpabi.h will have clobbered LINK_SPEC.  We want to
    use the GNU/Linux version, not the generic BPABI version.  */
 #undef  LINK_SPEC
diff --git a/gcc/config/i386/linux.h b/gcc/config/i386/linux.h
index 21ba2b2..e2b81e5 100644
--- a/gcc/config/i386/linux.h
+++ b/gcc/config/i386/linux.h
@@ -21,3 +21,4 @@ along with GCC; see the file COPYING3.  If not see
 
 #define GNU_USER_LINK_EMULATION "elf_i386"
 #define GLIBC_DYNAMIC_LINKER SYSTEMLIBS_DIR "ld-linux.so.2"
+#define MUSL_DYNAMIC_LINKER SYSTEMLIBS_DIR "ld-musl-i386.so.1"
diff --git a/gcc/config/i386/linux64.h b/gcc/config/i386/linux64.h
index 6185cce..5a3a977 100644
--- a/gcc/config/i386/linux64.h
+++ b/gcc/config/i386/linux64.h
@@ -30,3 +30,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define GLIBC_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-linux.so.2"
 #define GLIBC_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld-linux-x86-64.so.2"
 #define GLIBC_DYNAMIC_LINKERX32 SYSTEMLIBS_DIR "ld-linux-x32.so.2"
+
+#define MUSL_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-musl-i386.so.1"
+#define MUSL_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld-musl-x86_64.so.1"
+#define MUSL_DYNAMIC_LINKERX32 SYSTEMLIBS_DIR "ld-musl-x32.so.1"
+
diff --git a/gcc/config/mips/linux.h b/gcc/config/mips/linux.h
index c306afb..b899388 100644
--- a/gcc/config/mips/linux.h
+++ b/gcc/config/mips/linux.h
@@ -21,6 +21,12 @@ along with GCC; see the file COPYING3.  If not see
 #define GNU_USER_LINK_EMULATION64 "elf64%{EB:b}%{EL:l}tsmip"
 #define GNU_USER_LINK_EMULATIONN32 "elf32%{EB:b}%{EL:l}tsmipn32"
 
+#undef MUSL_DYNAMIC_LINKER32
+#define MUSL_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-musl-mips%{EL:el}%{msoft-float:-sf}.so.1"
+#undef MUSL_DYNAMIC_LINKER64
+#define MUSL_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld-musl-mips64%{EL:el}%{msoft-float:-sf}.so.1"
+#define MUSL_DYNAMIC_LINKERN32 SYSTEMLIBS_DIR "ld-musl-mipsn32%{EL:el}%{msoft-float:-sf}.so.1"
+
 #define GLIBC_DYNAMIC_LINKER32 \
   "%{mnan=2008:" SYSTEMLIBS_DIR "ld-linux-mipsn8.so.1;:" SYSTEMLIBS_DIR "ld.so.1}"
 #define GLIBC_DYNAMIC_LINKER64 \
@@ -40,4 +46,4 @@ along with GCC; see the file COPYING3.  If not see
 #define BIONIC_DYNAMIC_LINKERN32 "/system/bin/linker32"
 #define GNU_USER_DYNAMIC_LINKERN32 \
   CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKERN32, UCLIBC_DYNAMIC_LINKERN32, \
-                         BIONIC_DYNAMIC_LINKERN32)
+                         BIONIC_DYNAMIC_LINKERN32,  MUSL_DYNAMIC_LINKERN32)
diff --git a/gcc/config/rs6000/linux64.h b/gcc/config/rs6000/linux64.h
index 31c4338..679da4b 100644
--- a/gcc/config/rs6000/linux64.h
+++ b/gcc/config/rs6000/linux64.h
@@ -365,17 +365,22 @@ extern int dot_symbols;
 #endif
 #define UCLIBC_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-uClibc.so.0"
 #define UCLIBC_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld64-uClibc.so.0"
+#define MUSL_DYNAMIC_LINKER32 SYSTEMLIBS_DIR "ld-musl-powerpc.so.1"
+#define MUSL_DYNAMIC_LINKER64 SYSTEMLIBS_DIR "ld-musl-powerpc64.so.1"
+
 #if DEFAULT_LIBC == LIBC_UCLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
+#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{mmusl:" M ";:" U "}}"
 #elif DEFAULT_LIBC == LIBC_GLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
+#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{muclibc:" U ";:%{mmusl:" M ";:" G "}}"
+#elif DEFAULT_LIBC == LIBC_MUSL
+#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{muclibc:" U ";:" M "}}"
 #else
 #error "Unsupported DEFAULT_LIBC"
 #endif
 #define GNU_USER_DYNAMIC_LINKER32 \
-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32)
+  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER32, UCLIBC_DYNAMIC_LINKER32, MUSL_DYNAMIC_LINKER32)
 #define GNU_USER_DYNAMIC_LINKER64 \
-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64)
+  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER64, UCLIBC_DYNAMIC_LINKER64, MUSL_DYNAMIC_LINKER64)
 
 #undef  DEFAULT_ASM_ENDIAN
 #if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
diff --git a/gcc/config/rs6000/sysv4.h b/gcc/config/rs6000/sysv4.h
index 7cd07e0..8794fa5 100644
--- a/gcc/config/rs6000/sysv4.h
+++ b/gcc/config/rs6000/sysv4.h
@@ -763,15 +763,19 @@ ENDIAN_SELECT(" -mbig", " -mlittle", DEFAULT_ASM_ENDIAN)
 
 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
 #define UCLIBC_DYNAMIC_LINKER "/lib/ld-uClibc.so.0"
+#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-powerpc.so.1"
+
 #if DEFAULT_LIBC == LIBC_UCLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{mglibc:" G ";:" U "}"
+#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{mmusl:" M ";:" U "}}"
+#elif DEFAULT_LIBC == LIBC_MUSL
+#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{mglibc:" G ";:%{muclibc:" U ";:" M "}}"
 #elif !defined (DEFAULT_LIBC) || DEFAULT_LIBC == LIBC_GLIBC
-#define CHOOSE_DYNAMIC_LINKER(G, U) "%{muclibc:" U ";:" G "}"
+#define CHOOSE_DYNAMIC_LINKER(G, U, M) "%{muclibc:" U ";:%{mmusl:" M ";:" G "}}"
 #else
 #error "Unsupported DEFAULT_LIBC"
 #endif
 #define GNU_USER_DYNAMIC_LINKER \
-  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER)
+  CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER, MUSL_DYNAMIC_LINKER)
 
 #define LINK_OS_LINUX_SPEC "-m elf32ppclinux %{!shared: %{!static: \
   %{rdynamic:-export-dynamic} \
diff --git a/libitm/config/arm/hwcap.cc b/libitm/config/arm/hwcap.cc
index a1c2cfd..dd4fad2 100644
--- a/libitm/config/arm/hwcap.cc
+++ b/libitm/config/arm/hwcap.cc
@@ -40,7 +40,11 @@ int GTM_hwcap HIDDEN = 0
 
 #ifdef __linux__
 #include <unistd.h>
+#ifdef __GLIBC__
 #include <sys/fcntl.h>
+#else
+#include <fcntl.h>
+#endif
 #include <elf.h>
 
 static void __attribute__((constructor))
diff --git a/libitm/config/linux/x86/tls.h b/libitm/config/linux/x86/tls.h
index e731ab7..54ad8b6 100644
--- a/libitm/config/linux/x86/tls.h
+++ b/libitm/config/linux/x86/tls.h
@@ -25,16 +25,19 @@
 #ifndef LIBITM_X86_TLS_H
 #define LIBITM_X86_TLS_H 1
 
-#if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 10)
+#if defined(__GLIBC_PREREQ)
+#if __GLIBC_PREREQ(2, 10)
 /* Use slots in the TCB head rather than __thread lookups.
    GLIBC has reserved words 10 through 13 for TM.  */
 #define HAVE_ARCH_GTM_THREAD 1
 #define HAVE_ARCH_GTM_THREAD_DISP 1
 #endif
+#endif
 
 #include "config/generic/tls.h"
 
-#if defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 10)
+#if defined(__GLIBC_PREREQ)
+#if __GLIBC_PREREQ(2, 10)
 namespace GTM HIDDEN {
 
 #ifdef __x86_64__
@@ -101,5 +104,6 @@ static inline void set_abi_disp(struct abi_dispatch *x)
 
 } // namespace GTM
 #endif /* >= GLIBC 2.10 */
+#endif
 
 #endif // LIBITM_X86_TLS_H
-- 
2.7.4