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-rw-r--r--libc/sysdeps/linux/arc/bits/atomic.h76
-rwxr-xr-xlibc/sysdeps/linux/arc/bits/fcntl.h3
-rw-r--r--libc/sysdeps/linux/arc/bits/fenv.h75
-rwxr-xr-xlibc/sysdeps/linux/arc/bits/uClibc_arch_features.h3
4 files changed, 152 insertions, 5 deletions
diff --git a/libc/sysdeps/linux/arc/bits/atomic.h b/libc/sysdeps/linux/arc/bits/atomic.h
index 587860964..610b3c7c7 100644
--- a/libc/sysdeps/linux/arc/bits/atomic.h
+++ b/libc/sysdeps/linux/arc/bits/atomic.h
@@ -26,8 +26,10 @@ void __arc_link_error (void);
#ifdef __A7__
#define atomic_full_barrier() __asm__ __volatile__("": : :"memory")
+#define ARC_BARRIER_INSTR ""
#else
#define atomic_full_barrier() __asm__ __volatile__("dmb 3": : :"memory")
+#define ARC_BARRIER_INSTR "dmb 3"
#endif
/* Atomic compare and exchange. */
@@ -38,11 +40,12 @@ void __arc_link_error (void);
#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
({ __arc_link_error (); oldval; })
-#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
+#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
({ __arc_link_error (); oldval; })
#ifdef __CONFIG_ARC_HAS_ATOMICS__
+#ifdef __A7__
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
({ \
__typeof(oldval) prev; \
@@ -60,8 +63,55 @@ void __arc_link_error (void);
\
prev; \
})
+#else /* !__A7__ */
+#define USE_ATOMIC_COMPILER_BUILTINS 1
-#else
+#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+ ({ \
+ __typeof(*mem) __oldval = (oldval); \
+ __atomic_compare_exchange_n(mem, (void *) &__oldval, newval, 0, \
+ __ATOMIC_ACQUIRE, __ATOMIC_RELAXED); \
+ __oldval; \
+ })
+
+#define __arch_compare_and_exchange_val_8_rel(mem, newval, oldval) \
+ ({ __arc_link_error (); oldval; })
+
+#define __arch_compare_and_exchange_val_16_rel(mem, newval, oldval) \
+ ({ __arc_link_error (); oldval; })
+
+#define __arch_compare_and_exchange_val_64_rel(mem, newval, oldval) \
+ ({ __arc_link_error (); oldval; })
+
+#define __arch_compare_and_exchange_val_32_rel(mem, newval, oldval) \
+ ({ \
+ __typeof(*mem) __oldval = (oldval); \
+ __atomic_compare_exchange_n(mem, (void *) &__oldval, newval, 0, \
+ __ATOMIC_RELEASE, __ATOMIC_RELAXED); \
+ __oldval; \
+ })
+
+/* Compare and exchange with "acquire" semantics, ie barrier after */
+#define atomic_compare_and_exchange_val_acq(mem, new, old) \
+ __atomic_val_bysize(__arch_compare_and_exchange_val, acq, \
+ mem, new, old)
+
+/* Compare and exchange with "release" semantics, ie barrier before */
+#define atomic_compare_and_exchange_val_rel(mem, new, old) \
+ __atomic_val_bysize(__arch_compare_and_exchange_val, rel, \
+ mem, new, old)
+
+/* Explicitly define here to use release semantics*/
+#define atomic_compare_and_exchange_bool_rel(mem, newval, oldval) \
+ ({ \
+ __typeof (oldval) __atg3_old = (oldval); \
+ atomic_compare_and_exchange_val_rel (mem, newval, __atg3_old) \
+ != __atg3_old; \
+ })
+
+#endif /* __A7__ */
+
+#else /* !__CONFIG_ARC_HAS_ATOMICS__ */
#ifndef __NR_arc_usr_cmpxchg
#error "__NR_arc_usr_cmpxchg missing: Please upgrade to kernel 4.9+ headers"
@@ -101,6 +151,21 @@ void __arc_link_error (void);
__typeof__(*(mem)) val = newval; \
\
__asm__ __volatile__( \
+ "ex %0, [%1]\n" \
+ ARC_BARRIER_INSTR \
+ : "+r" (val) \
+ : "r" (mem) \
+ : "memory" ); \
+ \
+ val; \
+ })
+
+#define __arch_exchange_32_rel(mem, newval) \
+ ({ \
+ __typeof__(*(mem)) val = newval; \
+ \
+ __asm__ __volatile__( \
+ ARC_BARRIER_INSTR"\n" \
"ex %0, [%1]" \
: "+r" (val) \
: "r" (mem) \
@@ -115,3 +180,10 @@ void __arc_link_error (void);
abort(); \
__arch_exchange_32_acq(mem, newval); \
})
+
+#define atomic_exchange_rel(mem, newval) \
+ ({ \
+ if (sizeof(*(mem)) != 4) \
+ abort(); \
+ __arch_exchange_32_rel(mem, newval); \
+ })
diff --git a/libc/sysdeps/linux/arc/bits/fcntl.h b/libc/sysdeps/linux/arc/bits/fcntl.h
index beb32e41e..b02849691 100755
--- a/libc/sysdeps/linux/arc/bits/fcntl.h
+++ b/libc/sysdeps/linux/arc/bits/fcntl.h
@@ -230,3 +230,6 @@ extern ssize_t tee (int __fdin, int __fdout, size_t __len,
#endif
__END_DECLS
+
+/* Include generic Linux declarations. */
+#include <bits/fcntl-linux.h>
diff --git a/libc/sysdeps/linux/arc/bits/fenv.h b/libc/sysdeps/linux/arc/bits/fenv.h
new file mode 100644
index 000000000..c5c76cb93
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/fenv.h
@@ -0,0 +1,75 @@
+/* Floating point environment. ARC version.
+ Copyright (C) 2020-2025 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _FENV_H
+# error "Never use <bits/fenv.h> directly; include <fenv.h> instead."
+#endif
+
+enum
+ {
+ FE_INVALID =
+# define FE_INVALID (0x01)
+ FE_INVALID,
+ FE_DIVBYZERO =
+# define FE_DIVBYZERO (0x02)
+ FE_DIVBYZERO,
+ FE_OVERFLOW =
+# define FE_OVERFLOW (0x04)
+ FE_OVERFLOW,
+ FE_UNDERFLOW =
+# define FE_UNDERFLOW (0x08)
+ FE_UNDERFLOW,
+ FE_INEXACT =
+# define FE_INEXACT (0x10)
+ FE_INEXACT
+ };
+
+# define FE_ALL_EXCEPT \
+ (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)
+
+enum
+ {
+ FE_TOWARDZERO =
+# define FE_TOWARDZERO (0x0)
+ FE_TOWARDZERO,
+ FE_TONEAREST =
+# define FE_TONEAREST (0x1) /* default */
+ FE_TONEAREST,
+ FE_UPWARD =
+# define FE_UPWARD (0x2)
+ FE_UPWARD,
+ FE_DOWNWARD =
+# define FE_DOWNWARD (0x3)
+ FE_DOWNWARD
+ };
+
+typedef unsigned int fexcept_t;
+
+typedef struct
+{
+ unsigned int __fpcr;
+ unsigned int __fpsr;
+} fenv_t;
+
+/* If the default argument is used we use this value. */
+#define FE_DFL_ENV ((const fenv_t *) -1)
+
+/* Type representing floating-point control modes. */
+typedef unsigned int femode_t;
+
+/* Default floating-point control modes. */
+# define FE_DFL_MODE ((const femode_t *) -1L)
diff --git a/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h b/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h
index 119bbb7e1..94e089d5d 100755
--- a/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h
+++ b/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h
@@ -17,9 +17,6 @@
/* can your target use syscall6() for mmap ? */
#undef __UCLIBC_MMAP_HAS_6_ARGS__
-/* does your target use statx */
-#undef __UCLIBC_HAVE_STATX__
-
/* does your target have a broken create_module() ? */
#undef __UCLIBC_BROKEN_CREATE_MODULE__
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-01 13:44:08 +0000