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Diffstat (limited to 'libgcc/config/nios2/linux-atomic.c')
-rw-r--r--libgcc/config/nios2/linux-atomic.c281
1 files changed, 0 insertions, 281 deletions
diff --git a/libgcc/config/nios2/linux-atomic.c b/libgcc/config/nios2/linux-atomic.c
deleted file mode 100644
index 26308ce..0000000
--- a/libgcc/config/nios2/linux-atomic.c
+++ /dev/null
@@ -1,281 +0,0 @@
-/* Linux-specific atomic operations for Nios II Linux.
- Copyright (C) 2008-2024 Free Software Foundation, Inc.
-
-This file is free software; you can redistribute it and/or modify it
-under the terms of the GNU General Public License as published by the
-Free Software Foundation; either version 3, or (at your option) any
-later version.
-
-This file 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
-General Public License for more details.
-
-Under Section 7 of GPL version 3, you are granted additional
-permissions described in the GCC Runtime Library Exception, version
-3.1, as published by the Free Software Foundation.
-
-You should have received a copy of the GNU General Public License and
-a copy of the GCC Runtime Library Exception along with this program;
-see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
-<http://www.gnu.org/licenses/>. */
-
-/* We implement byte, short and int versions of each atomic operation
- using the kernel helper defined below. There is no support for
- 64-bit operations yet. */
-
-/* Crash a userspace program with SIGSEV. */
-#define ABORT_INSTRUCTION asm ("stw zero, 0(zero)")
-
-/* Kernel helper for compare-and-exchange a 32-bit value. */
-static inline long
-__kernel_cmpxchg (int oldval, int newval, int *mem)
-{
- register int r2 asm ("r2");
- register int *r4 asm ("r4") = mem;
- register int r5 asm ("r5") = oldval;
- register int r6 asm ("r6") = newval;
-
- /* Call the kernel provided fixed address cmpxchg helper routine. */
- asm volatile ("movi %0, %4\n\t"
- "callr %0\n"
- : "=r" (r2)
- : "r" (r4), "r" (r5), "r" (r6), "I" (0x00001004)
- : "ra", "memory");
- return r2;
-}
-
-#define HIDDEN __attribute__ ((visibility ("hidden")))
-
-#ifdef __nios2_little_endian__
-#define INVERT_MASK_1 0
-#define INVERT_MASK_2 0
-#else
-#define INVERT_MASK_1 24
-#define INVERT_MASK_2 16
-#endif
-
-#define MASK_1 0xffu
-#define MASK_2 0xffffu
-
-#define FETCH_AND_OP_WORD(OP, PFX_OP, INF_OP) \
- int HIDDEN \
- __sync_fetch_and_##OP##_4 (int *ptr, int val) \
- { \
- int failure, tmp; \
- \
- do { \
- tmp = *ptr; \
- failure = __kernel_cmpxchg (tmp, PFX_OP (tmp INF_OP val), ptr); \
- } while (failure != 0); \
- \
- return tmp; \
- }
-
-FETCH_AND_OP_WORD (add, , +)
-FETCH_AND_OP_WORD (sub, , -)
-FETCH_AND_OP_WORD (or, , |)
-FETCH_AND_OP_WORD (and, , &)
-FETCH_AND_OP_WORD (xor, , ^)
-FETCH_AND_OP_WORD (nand, ~, &)
-
-#define NAME_oldval(OP, WIDTH) __sync_fetch_and_##OP##_##WIDTH
-#define NAME_newval(OP, WIDTH) __sync_##OP##_and_fetch_##WIDTH
-
-/* Implement both __sync_<op>_and_fetch and __sync_fetch_and_<op> for
- subword-sized quantities. */
-
-#define SUBWORD_SYNC_OP(OP, PFX_OP, INF_OP, TYPE, WIDTH, RETURN) \
- TYPE HIDDEN \
- NAME##_##RETURN (OP, WIDTH) (TYPE *ptr, TYPE val) \
- { \
- int *wordptr = (int *) ((unsigned long) ptr & ~3); \
- unsigned int mask, shift, oldval, newval; \
- int failure; \
- \
- shift = (((unsigned long) ptr & 3) << 3) ^ INVERT_MASK_##WIDTH; \
- mask = MASK_##WIDTH << shift; \
- \
- do { \
- oldval = *wordptr; \
- newval = ((PFX_OP (((oldval & mask) >> shift) \
- INF_OP (unsigned int) val)) << shift) & mask; \
- newval |= oldval & ~mask; \
- failure = __kernel_cmpxchg (oldval, newval, wordptr); \
- } while (failure != 0); \
- \
- return (RETURN & mask) >> shift; \
- }
-
-SUBWORD_SYNC_OP (add, , +, unsigned short, 2, oldval)
-SUBWORD_SYNC_OP (sub, , -, unsigned short, 2, oldval)
-SUBWORD_SYNC_OP (or, , |, unsigned short, 2, oldval)
-SUBWORD_SYNC_OP (and, , &, unsigned short, 2, oldval)
-SUBWORD_SYNC_OP (xor, , ^, unsigned short, 2, oldval)
-SUBWORD_SYNC_OP (nand, ~, &, unsigned short, 2, oldval)
-
-SUBWORD_SYNC_OP (add, , +, unsigned char, 1, oldval)
-SUBWORD_SYNC_OP (sub, , -, unsigned char, 1, oldval)
-SUBWORD_SYNC_OP (or, , |, unsigned char, 1, oldval)
-SUBWORD_SYNC_OP (and, , &, unsigned char, 1, oldval)
-SUBWORD_SYNC_OP (xor, , ^, unsigned char, 1, oldval)
-SUBWORD_SYNC_OP (nand, ~, &, unsigned char, 1, oldval)
-
-#define OP_AND_FETCH_WORD(OP, PFX_OP, INF_OP) \
- int HIDDEN \
- __sync_##OP##_and_fetch_4 (int *ptr, int val) \
- { \
- int tmp, failure; \
- \
- do { \
- tmp = *ptr; \
- failure = __kernel_cmpxchg (tmp, PFX_OP (tmp INF_OP val), ptr); \
- } while (failure != 0); \
- \
- return PFX_OP (tmp INF_OP val); \
- }
-
-OP_AND_FETCH_WORD (add, , +)
-OP_AND_FETCH_WORD (sub, , -)
-OP_AND_FETCH_WORD (or, , |)
-OP_AND_FETCH_WORD (and, , &)
-OP_AND_FETCH_WORD (xor, , ^)
-OP_AND_FETCH_WORD (nand, ~, &)
-
-SUBWORD_SYNC_OP (add, , +, unsigned short, 2, newval)
-SUBWORD_SYNC_OP (sub, , -, unsigned short, 2, newval)
-SUBWORD_SYNC_OP (or, , |, unsigned short, 2, newval)
-SUBWORD_SYNC_OP (and, , &, unsigned short, 2, newval)
-SUBWORD_SYNC_OP (xor, , ^, unsigned short, 2, newval)
-SUBWORD_SYNC_OP (nand, ~, &, unsigned short, 2, newval)
-
-SUBWORD_SYNC_OP (add, , +, unsigned char, 1, newval)
-SUBWORD_SYNC_OP (sub, , -, unsigned char, 1, newval)
-SUBWORD_SYNC_OP (or, , |, unsigned char, 1, newval)
-SUBWORD_SYNC_OP (and, , &, unsigned char, 1, newval)
-SUBWORD_SYNC_OP (xor, , ^, unsigned char, 1, newval)
-SUBWORD_SYNC_OP (nand, ~, &, unsigned char, 1, newval)
-
-int HIDDEN
-__sync_val_compare_and_swap_4 (int *ptr, int oldval, int newval)
-{
- int actual_oldval, fail;
-
- while (1)
- {
- actual_oldval = *ptr;
-
- if (oldval != actual_oldval)
- return actual_oldval;
-
- fail = __kernel_cmpxchg (actual_oldval, newval, ptr);
-
- if (!fail)
- return oldval;
- }
-}
-
-#define SUBWORD_VAL_CAS(TYPE, WIDTH) \
- TYPE HIDDEN \
- __sync_val_compare_and_swap_##WIDTH (TYPE *ptr, TYPE oldval, \
- TYPE newval) \
- { \
- int *wordptr = (int *)((unsigned long) ptr & ~3), fail; \
- unsigned int mask, shift, actual_oldval, actual_newval; \
- \
- shift = (((unsigned long) ptr & 3) << 3) ^ INVERT_MASK_##WIDTH; \
- mask = MASK_##WIDTH << shift; \
- \
- while (1) \
- { \
- actual_oldval = *wordptr; \
- \
- if (((actual_oldval & mask) >> shift) != (unsigned int) oldval) \
- return (actual_oldval & mask) >> shift; \
- \
- actual_newval = (actual_oldval & ~mask) \
- | (((unsigned int) newval << shift) & mask); \
- \
- fail = __kernel_cmpxchg (actual_oldval, actual_newval, \
- wordptr); \
- \
- if (!fail) \
- return oldval; \
- } \
- }
-
-SUBWORD_VAL_CAS (unsigned short, 2)
-SUBWORD_VAL_CAS (unsigned char, 1)
-
-typedef unsigned char bool;
-
-bool HIDDEN
-__sync_bool_compare_and_swap_4 (int *ptr, int oldval, int newval)
-{
- int failure = __kernel_cmpxchg (oldval, newval, ptr);
- return (failure == 0);
-}
-
-#define SUBWORD_BOOL_CAS(TYPE, WIDTH) \
- bool HIDDEN \
- __sync_bool_compare_and_swap_##WIDTH (TYPE *ptr, TYPE oldval, \
- TYPE newval) \
- { \
- TYPE actual_oldval \
- = __sync_val_compare_and_swap_##WIDTH (ptr, oldval, newval); \
- return (oldval == actual_oldval); \
- }
-
-SUBWORD_BOOL_CAS (unsigned short, 2)
-SUBWORD_BOOL_CAS (unsigned char, 1)
-
-int HIDDEN
-__sync_lock_test_and_set_4 (int *ptr, int val)
-{
- int failure, oldval;
-
- do {
- oldval = *ptr;
- failure = __kernel_cmpxchg (oldval, val, ptr);
- } while (failure != 0);
-
- return oldval;
-}
-
-#define SUBWORD_TEST_AND_SET(TYPE, WIDTH) \
- TYPE HIDDEN \
- __sync_lock_test_and_set_##WIDTH (TYPE *ptr, TYPE val) \
- { \
- int failure; \
- unsigned int oldval, newval, shift, mask; \
- int *wordptr = (int *) ((unsigned long) ptr & ~3); \
- \
- shift = (((unsigned long) ptr & 3) << 3) ^ INVERT_MASK_##WIDTH; \
- mask = MASK_##WIDTH << shift; \
- \
- do { \
- oldval = *wordptr; \
- newval = (oldval & ~mask) \
- | (((unsigned int) val << shift) & mask); \
- failure = __kernel_cmpxchg (oldval, newval, wordptr); \
- } while (failure != 0); \
- \
- return (oldval & mask) >> shift; \
- }
-
-SUBWORD_TEST_AND_SET (unsigned short, 2)
-SUBWORD_TEST_AND_SET (unsigned char, 1)
-
-#define SYNC_LOCK_RELEASE(TYPE, WIDTH) \
- void HIDDEN \
- __sync_lock_release_##WIDTH (TYPE *ptr) \
- { \
- /* All writes before this point must be seen before we release \
- the lock itself. */ \
- __builtin_sync (); \
- *ptr = 0; \
- }
-
-SYNC_LOCK_RELEASE (int, 4)
-SYNC_LOCK_RELEASE (short, 2)
-SYNC_LOCK_RELEASE (char, 1)
generated by cgit v1.1 at 2025-07-17 06:13:32 +0000