2019-09-17 Adhemerval Zanella <adhemerval.zanella@linaro.org>
+ * sysdeps/unix/sysv/linux/libc-vdso.h (VDSO_IFUNC_RET): Define if not
+ defined.
+ * sysdeps/unix/sysv/linux/powerpc/get_timebase_freq.c
+ (__get_timebase_freq): Remove use of
+ INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK.
+ (get_timebase_freq_fallback): New symbol.
+ * sysdeps/unix/sysv/linux/powerpc/gettimeofday.c (time): Use
+ HAVE_GETTIMEOFDAY_VSYSCALL.
+ * sysdeps/unix/sysv/linux/powerpc/time.c (gettimeofday): Use
+ HAVE_TIME_VSYSCALL.
+ * sysdeps/unix/sysv/linux/powerpc/libc-vdso.h: Include generic
+ implementation.
+ * sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
+ (INTERNAL_VSYSCALL_CALL_TYPE): Make calling convention similar to
+ powerpc64.
+ (INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK): Remove macro.
+ * .../sysv/linux/powerpc/powerpc64/sysdep.h
+ (INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK): Likewise.
+ * sysdeps/unix/sysv/linux/powerpc/sysdep.h
+ (HAVE_GETTIMEOFDAY_VSYSCALL): Define.
+
* sysdeps/powerpc/powerpc32/backtrace.c (is_sigtramp_address,
is_sigtramp_address_rt): Use HAVE_SIGTRAMP_{RT}32 instead of SHARED.
* sysdeps/powerpc/powerpc64/backtrace.c (is_sigtramp_address):
#define VDSO_SYMBOL(__name) __vdso_##__name
+/* Adjust the return IFUNC value from a vDSO symbol accordingly required
+ by the ELFv1 ABI. It is used by the architecture to create an ODP
+ entry since the kernel vDSO does not provide it. */
+#ifndef VDSO_IFUNC_RET
+# define VDSO_IFUNC_RET(__value) (__value)
+#endif
+
#ifdef HAVE_CLOCK_GETTIME_VSYSCALL
extern int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
attribute_hidden;
#include <not-cancel.h>
#include <libc-vdso.h>
-uint64_t
-__get_timebase_freq (void)
+static uint64_t
+get_timebase_freq_fallback (void)
{
hp_timing_t result = 0L;
-#ifdef SHARED
- /* The vDSO does not return an error (it clear cr0.so on returning). */
- INTERNAL_SYSCALL_DECL (err);
- result =
- INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK (get_tbfreq, err, uint64_t, 0);
-#else
/* We read the information from the /proc filesystem. /proc/cpuinfo
contains at least one line like:
timebase : 33333333
}
}
}
-#endif
return result;
}
+
+uint64_t
+__get_timebase_freq (void)
+{
+ /* The vDSO does not have a fallback mechanism (such calling a syscall). */
+ __typeof (VDSO_SYMBOL (get_tbfreq)) vdsop = VDSO_SYMBOL (get_tbfreq);
+ PTR_DEMANGLE (vdsop);
+ if (vdsop == NULL)
+ return get_timebase_freq_fallback ();
+
+ INTERNAL_SYSCALL_DECL (err);
+ return INTERNAL_VSYSCALL_CALL_TYPE (vdsop, err, uint64_t, 0);
+}
weak_alias (__get_timebase_freq, __ppc_get_timebase_freq)
#include <sysdep.h>
#include <sysdep-vdso.h>
-#include_next <libc-vdso.h>
-
-extern unsigned long long (*VDSO_SYMBOL(get_tbfreq)) (void);
-#if defined(__PPC64__) || defined(__powerpc64__)
-extern void *VDSO_SYMBOL(sigtramp_rt64);
-#else
-extern void *VDSO_SYMBOL(sigtramp32);
-extern void *VDSO_SYMBOL(sigtramp_rt32);
-#endif
#if (defined(__PPC64__) || defined(__powerpc64__)) && _CALL_ELF != 2
+# include <dl-machine.h>
/* The correct solution is for _dl_vdso_vsym to return the address of the OPD
for the kernel VDSO function. That address would then be stored in the
__vdso_* variables and returned as the result of the IFUNC resolver function.
are processed immediately at startup the resolver functions and this code need
not be thread-safe, but if the caller writes to a PLT slot it must do so in a
thread-safe manner with all the required barriers. */
-#define VDSO_IFUNC_RET(value) \
+# define VDSO_IFUNC_RET(value) \
({ \
static Elf64_FuncDesc vdso_opd = { .fd_toc = ~0x0 }; \
vdso_opd.fd_func = (Elf64_Addr)value; \
})
#else
-#define VDSO_IFUNC_RET(value) ((void *) (value))
+# define VDSO_IFUNC_RET(value) ((void *) (value))
+#endif
+
+#include_next <libc-vdso.h>
+
+extern unsigned long long (*VDSO_SYMBOL(get_tbfreq)) (void);
+#if defined(__PPC64__) || defined(__powerpc64__)
+extern void *VDSO_SYMBOL(sigtramp_rt64);
+#else
+extern void *VDSO_SYMBOL(sigtramp32);
+extern void *VDSO_SYMBOL(sigtramp_rt32);
#endif
#endif /* _LIBC_VDSO_H */
function call, with the exception of LR (which is needed for the
"sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
an error return status). */
-# define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, nr, type, args...) \
+# define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, type, nr, args...) \
({ \
register void *r0 __asm__ ("r0"); \
register long int r3 __asm__ ("r3"); \
})
#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
- INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, nr, long int, args)
+ INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, long int, nr, args)
# undef INLINE_SYSCALL
# define INLINE_SYSCALL(name, nr, args...) \
# undef INTERNAL_SYSCALL_ERRNO
# define INTERNAL_SYSCALL_ERRNO(val, err) (val)
-# define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...) \
- ({ \
- type sc_ret = ENOSYS; \
- \
- __typeof (__vdso_##name) vdsop = __vdso_##name; \
- PTR_DEMANGLE (vdsop); \
- if (vdsop != NULL) \
- sc_ret = \
- INTERNAL_VSYSCALL_CALL_TYPE (vdsop, err, nr, type, ##args); \
- else \
- err = 1 << 28; \
- sc_ret; \
- })
-
# define LOADARGS_0(name, dummy) \
r0 = name
# define LOADARGS_1(name, __arg1) \
#endif /* __ASSEMBLER__ */
-/* This version is for internal uses when there is no desire
- to set errno */
-#define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...) \
- ({ \
- type sc_ret = ENOSYS; \
- \
- __typeof (__vdso_##name) vdsop = __vdso_##name; \
- PTR_DEMANGLE (vdsop); \
- if (vdsop != NULL) \
- sc_ret = \
- INTERNAL_VSYSCALL_CALL_TYPE (vdsop, err, type, nr, ##args); \
- else \
- err = 1 << 28; \
- sc_ret; \
- })
-
/* Define a macro which expands inline into the wrapper code for a system
call. This use is for internal calls that do not need to handle errors
normally. It will never touch errno. This returns just what the kernel
#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, long int, nr, args)
-#undef INLINE_SYSCALL
-
/* This version is for kernels that implement system calls that
behave like function calls as far as register saving. */
+#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
({ \
INTERNAL_SYSCALL_DECL (sc_err); \
projects / thirdparty / glibc.git / commitdiff
