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-rw-r--r--sysdeps/unix/sysv/linux/arm/sysdep-cancel.h207
1 files changed, 7 insertions, 200 deletions
diff --git a/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h b/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h
index de12acf046..8930245ff3 100644
--- a/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h
+++ b/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h
@@ -17,216 +17,26 @@
#include <sysdep.h>
#include <tls.h>
-#ifndef __ASSEMBLER__
-# include <nptl/pthreadP.h>
-#endif
+#include <nptl/pthreadP.h>
#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
-/* NOTE: We do mark syscalls with unwind annotations, for the benefit of
- cancellation; but they're really only accurate at the point of the
- syscall. The ARM unwind directives are not rich enough without adding
- a custom personality function. */
-
-# undef PSEUDO
-# define PSEUDO(name, syscall_name, args) \
- .text; \
- ENTRY (__##syscall_name##_nocancel); \
- CFI_SECTIONS; \
- DO_CALL (syscall_name, args); \
- cmn r0, $4096; \
- PSEUDO_RET; \
- END (__##syscall_name##_nocancel); \
- ENTRY (name); \
- SINGLE_THREAD_P; \
- DOARGS_##args; \
- bne .Lpseudo_cancel; \
- cfi_remember_state; \
- ldr r7, =SYS_ify (syscall_name); \
- swi 0x0; \
- UNDOARGS_##args; \
- cmn r0, $4096; \
- PSEUDO_RET; \
- cfi_restore_state; \
- .Lpseudo_cancel: \
- .fnstart; /* matched by the .fnend in UNDOARGS below. */ \
- DOCARGS_##args; /* save syscall args etc. around CENABLE. */ \
- CENABLE; \
- mov ip, r0; /* put mask in safe place. */ \
- UNDOCARGS_##args; /* restore syscall args. */ \
- ldr r7, =SYS_ify (syscall_name); \
- swi 0x0; /* do the call. */ \
- mov r7, r0; /* save syscall return value. */ \
- mov r0, ip; /* get mask back. */ \
- CDISABLE; \
- mov r0, r7; /* retrieve return value. */ \
- RESTORE_LR_##args; \
- UNDOARGS_##args; \
- cmn r0, $4096
-
-/* DOARGS pushes eight bytes on the stack for five arguments, twelve bytes for
- six arguments, and four bytes for fewer. In order to preserve doubleword
- alignment, sometimes we must save an extra register. */
-
-# define RESTART_UNWIND \
- .fnend; \
- .fnstart; \
- .save {r7}; \
- .save {lr}
-
-# define DOCARGS_0 \
- .save {r7}; \
- push {lr}; \
- cfi_adjust_cfa_offset (4); \
- cfi_rel_offset (lr, 0); \
- .save {lr}
-# define UNDOCARGS_0
-# define RESTORE_LR_0 \
- pop {lr}; \
- cfi_adjust_cfa_offset (-4); \
- cfi_restore (lr)
-
-# define DOCARGS_1 \
- .save {r7}; \
- push {r0, r1, lr}; \
- cfi_adjust_cfa_offset (12); \
- cfi_rel_offset (lr, 8); \
- .save {lr}; \
- .pad #8
-# define UNDOCARGS_1 \
- ldr r0, [sp], #8; \
- cfi_adjust_cfa_offset (-8); \
- RESTART_UNWIND
-# define RESTORE_LR_1 \
- RESTORE_LR_0
-
-# define DOCARGS_2 \
- .save {r7}; \
- push {r0, r1, lr}; \
- cfi_adjust_cfa_offset (12); \
- cfi_rel_offset (lr, 8); \
- .save {lr}; \
- .pad #8
-# define UNDOCARGS_2 \
- pop {r0, r1}; \
- cfi_adjust_cfa_offset (-8); \
- RESTART_UNWIND
-# define RESTORE_LR_2 \
- RESTORE_LR_0
-
-# define DOCARGS_3 \
- .save {r7}; \
- push {r0, r1, r2, r3, lr}; \
- cfi_adjust_cfa_offset (20); \
- cfi_rel_offset (lr, 16); \
- .save {lr}; \
- .pad #16
-# define UNDOCARGS_3 \
- pop {r0, r1, r2, r3}; \
- cfi_adjust_cfa_offset (-16); \
- RESTART_UNWIND
-# define RESTORE_LR_3 \
- RESTORE_LR_0
-
-# define DOCARGS_4 \
- .save {r7}; \
- push {r0, r1, r2, r3, lr}; \
- cfi_adjust_cfa_offset (20); \
- cfi_rel_offset (lr, 16); \
- .save {lr}; \
- .pad #16
-# define UNDOCARGS_4 \
- pop {r0, r1, r2, r3}; \
- cfi_adjust_cfa_offset (-16); \
- RESTART_UNWIND
-# define RESTORE_LR_4 \
- RESTORE_LR_0
-
-/* r4 is only stmfd'ed for correct stack alignment. */
-# define DOCARGS_5 \
- .save {r4, r7}; \
- push {r0, r1, r2, r3, r4, lr}; \
- cfi_adjust_cfa_offset (24); \
- cfi_rel_offset (lr, 20); \
- .save {lr}; \
- .pad #20
-# define UNDOCARGS_5 \
- pop {r0, r1, r2, r3}; \
- cfi_adjust_cfa_offset (-16); \
- .fnend; \
- .fnstart; \
- .save {r4, r7}; \
- .save {lr}; \
- .pad #4
-# define RESTORE_LR_5 \
- pop {r4, lr}; \
- cfi_adjust_cfa_offset (-8); \
- /* r4 will be marked as restored later. */ \
- cfi_restore (lr)
-
-# define DOCARGS_6 \
- .save {r4, r5, r7}; \
- push {r0, r1, r2, r3, lr}; \
- cfi_adjust_cfa_offset (20); \
- cfi_rel_offset (lr, 16); \
- .save {lr}; \
- .pad #16
-# define UNDOCARGS_6 \
- pop {r0, r1, r2, r3}; \
- cfi_adjust_cfa_offset (-16); \
- .fnend; \
- .fnstart; \
- .save {r4, r5, r7}; \
- .save {lr};
-# define RESTORE_LR_6 \
- RESTORE_LR_0
-
# if IS_IN (libpthread)
-# define CENABLE bl PLTJMP(__pthread_enable_asynccancel)
-# define CDISABLE bl PLTJMP(__pthread_disable_asynccancel)
# define __local_multiple_threads __pthread_multiple_threads
# elif IS_IN (libc)
-# define CENABLE bl PLTJMP(__libc_enable_asynccancel)
-# define CDISABLE bl PLTJMP(__libc_disable_asynccancel)
# define __local_multiple_threads __libc_multiple_threads
-# elif IS_IN (librt)
-# define CENABLE bl PLTJMP(__librt_enable_asynccancel)
-# define CDISABLE bl PLTJMP(__librt_disable_asynccancel)
-# else
-# error Unsupported library
# endif
# if IS_IN (libpthread) || IS_IN (libc)
-# ifndef __ASSEMBLER__
extern int __local_multiple_threads attribute_hidden;
-# define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
-# else
-# define SINGLE_THREAD_P \
- LDST_PCREL(ldr, ip, ip, __local_multiple_threads); \
- teq ip, #0
-# endif
+# define SINGLE_THREAD_P __glibc_likely (__local_multiple_threads == 0)
# else
/* There is no __local_multiple_threads for librt, so use the TCB. */
-# ifndef __ASSEMBLER__
-# define SINGLE_THREAD_P \
- __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
- header.multiple_threads) == 0, 1)
-# else
-# define SINGLE_THREAD_P \
- push {r0, lr}; \
- cfi_adjust_cfa_offset (8); \
- cfi_rel_offset (lr, 4); \
- GET_TLS (lr); \
- NEGOFF_ADJ_BASE (r0, MULTIPLE_THREADS_OFFSET); \
- ldr ip, NEGOFF_OFF1 (r0, MULTIPLE_THREADS_OFFSET); \
- pop {r0, lr}; \
- cfi_adjust_cfa_offset (-8); \
- cfi_restore (lr); \
- teq ip, #0
-# endif
+# define SINGLE_THREAD_P \
+ __glibc_likely (THREAD_GETMEM (THREAD_SELF, header.multiple_threads) == 0)
# endif
-#elif !defined __ASSEMBLER__
+#else
/* For rtld, et cetera. */
# define SINGLE_THREAD_P 1
@@ -234,8 +44,5 @@ extern int __local_multiple_threads attribute_hidden;
#endif
-#ifndef __ASSEMBLER__
-# define RTLD_SINGLE_THREAD_P \
- __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
- header.multiple_threads) == 0, 1)
-#endif
+#define RTLD_SINGLE_THREAD_P \
+ __glibc_likely (THREAD_GETMEM (THREAD_SELF, header.multiple_threads) == 0)
generated by cgit v1.2.3-70-g09d2 (git 2.50.0) at 2025-08-18 18:59:32 +0000