Update copyright dates with scripts/update-copyrights

[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / powerpc / sysdep.h

diff --git a/sysdeps/unix/sysv/linux/powerpc/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
index b2bca598b9d10827a04ca05b9c62a5929140aaeb..d3605d562d2747a83bf25979573feef6149c9ca7 100644 (file)
--- a/sysdeps/unix/sysv/linux/powerpc/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
@@ -1,5 +1,5 @@
 /* Syscall definitions, Linux PowerPC generic version.
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -64,39 +64,84 @@
 #define INTERNAL_VSYSCALL_CALL(funcptr, nr, args...)                   \
   INTERNAL_VSYSCALL_CALL_TYPE(funcptr, long int, nr, args)
 
+#define DECLARE_REGS                           \
+  register long int r0  __asm__ ("r0");                \
+  register long int r3  __asm__ ("r3");                \
+  register long int r4  __asm__ ("r4");                \
+  register long int r5  __asm__ ("r5");                \
+  register long int r6  __asm__ ("r6");                \
+  register long int r7  __asm__ ("r7");                \
+  register long int r8  __asm__ ("r8");
 
-#undef INTERNAL_SYSCALL
-#define INTERNAL_SYSCALL_NCS(name, nr, args...) \
-  ({                                                                   \
-    register long int r0  __asm__ ("r0");                              \
-    register long int r3  __asm__ ("r3");                              \
-    register long int r4  __asm__ ("r4");                              \
-    register long int r5  __asm__ ("r5");                              \
-    register long int r6  __asm__ ("r6");                              \
-    register long int r7  __asm__ ("r7");                              \
-    register long int r8  __asm__ ("r8");                              \
-    LOADARGS_##nr (name, ##args);                                      \
-    __asm__ __volatile__                                               \
-      ("sc\n\t"                                                                \
-       "mfcr  %0\n\t"                                                  \
-       "0:"                                                            \
-       : "=&r" (r0),                                                   \
-         "=&r" (r3), "=&r" (r4), "=&r" (r5),                           \
-         "=&r" (r6), "=&r" (r7), "=&r" (r8)                            \
-       : ASM_INPUT_##nr                                                        \
-       : "r9", "r10", "r11", "r12",                                    \
-         "cr0", "ctr", "memory");                                      \
-    r0 & (1 << 28) ? -r3 : r3;                                         \
+#define SYSCALL_SCV(nr)                                \
+  ({                                           \
+    __asm__ __volatile__                       \
+      ("scv 0\n\t"                             \
+       "0:"                                    \
+       : "=&r" (r0),                           \
+        "=&r" (r3), "=&r" (r4), "=&r" (r5),    \
+        "=&r" (r6), "=&r" (r7), "=&r" (r8)     \
+       : ASM_INPUT_##nr                        \
+       : "r9", "r10", "r11", "r12",            \
+        "lr", "ctr", "memory");                \
+    r3;                                        \
   })
-#define INTERNAL_SYSCALL(name, nr, args...)                            \
-  INTERNAL_SYSCALL_NCS (__NR_##name, nr, args)
+
+#define SYSCALL_SC(nr)                         \
+  ({                                           \
+    __asm__ __volatile__                       \
+      ("sc\n\t"                                \
+       "mfcr %0\n\t"                           \
+       "0:"                                    \
+       : "=&r" (r0),                           \
+        "=&r" (r3), "=&r" (r4), "=&r" (r5),    \
+        "=&r" (r6), "=&r" (r7), "=&r" (r8)     \
+       : ASM_INPUT_##nr                        \
+       : "r9", "r10", "r11", "r12",            \
+        "cr0", "ctr", "memory");               \
+    r0 & (1 << 28) ? -r3 : r3;                 \
+  })
+
+/* This will only be non-empty for 64-bit systems, see below.  */
+#define TRY_SYSCALL_SCV(nr)
 
 #if defined(__PPC64__) || defined(__powerpc64__)
 # define SYSCALL_ARG_SIZE 8
+
+/* For the static case, unlike the dynamic loader, there is no compile-time way
+   to check if we are inside startup code.  So we need to check if the thread
+   pointer has already been setup before trying to access the TLS.  */
+# ifndef SHARED
+#  define CHECK_THREAD_POINTER (__thread_register != 0)
+# else
+#  define CHECK_THREAD_POINTER (1)
+# endif
+
+/* When inside the dynamic loader, the thread pointer may not have been
+   initialized yet, so don't check for scv support in that case.  */
+# if !IS_IN(rtld)
+#  undef TRY_SYSCALL_SCV
+#  define TRY_SYSCALL_SCV(nr)                                          \
+  CHECK_THREAD_POINTER && THREAD_GET_HWCAP() & PPC_FEATURE2_SCV ?      \
+      SYSCALL_SCV(nr) :
+# endif
+
 #else
 # define SYSCALL_ARG_SIZE 4
 #endif
 
+# define INTERNAL_SYSCALL_NCS(name, nr, args...)       \
+  ({                                                   \
+    DECLARE_REGS;                                      \
+    LOADARGS_##nr (name, ##args);                      \
+    TRY_SYSCALL_SCV(nr)                                        \
+    SYSCALL_SC(nr);                                    \
+  })
+
+#undef INTERNAL_SYSCALL
+#define INTERNAL_SYSCALL(name, nr, args...)                            \
+  INTERNAL_SYSCALL_NCS (__NR_##name, nr, args)
+
 #define LOADARGS_0(name, dummy) \
        r0 = name
 #define LOADARGS_1(name, __arg1) \