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1827059925
At issue for INLINE_SYSCALL was that it used "err" and "val" as variable names in a #define, so that if it was used in a context where the "caller" was also using "err" or "val", and those variables were passed in to INLINE_SYSCALL, we would end up referencing the internal shadowed variables instead. For example, "char val" in check_may_shrink_heap() in sysdeps/unix/sysv/linux/malloc-sysdep.h was being shadowed by the syscall return "val" in INLINE_SYSCALL, causing the "char val" not to get updated at all, and may_shrink_heap ended up always false. A similar fix was made to INTERNAL_VSYSCALL_CALL.
237 lines
10 KiB
C
237 lines
10 KiB
C
/* Copyright (C) 2011-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <asm/unistd.h>
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#include <sysdeps/tile/sysdep.h>
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#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
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#include <sys/syscall.h>
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#undef SYS_ify
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#define SYS_ify(syscall_name) __NR_##syscall_name
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#ifdef __ASSEMBLER__
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/* The actual implementation of doing a syscall. */
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#define DO_CALL(syscall_name, args) \
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moveli TREG_SYSCALL_NR_NAME, SYS_ify(syscall_name); \
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swint1
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/* TILE Linux returns the result in r0 (or a negative errno).
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The kernel "owns" the code to decide if a given value is an error,
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and puts errno in r1 if so, or otherwise zero. */
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#define PSEUDO(name, syscall_name, args) \
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ENTRY (name); \
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DO_CALL(syscall_name, args); \
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BNEZ r1, 0f
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#define ret jrp lr
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#ifndef PIC
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/* For static code, on error jump to __syscall_error directly. */
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# define SYSCALL_ERROR_NAME __syscall_error
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#elif IS_IN (libc) || IS_IN (libpthread)
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/* Use the internal name for libc/libpthread shared objects. */
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# define SYSCALL_ERROR_NAME __GI___syscall_error
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#else
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/* Otherwise, on error do a full PLT jump. */
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# define SYSCALL_ERROR_NAME plt(__syscall_error)
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#endif
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#define PSEUDO_END(name) \
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0: \
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j SYSCALL_ERROR_NAME; \
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END (name)
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#define PSEUDO_NOERRNO(name, syscall_name, args) \
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ENTRY (name); \
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DO_CALL(syscall_name, args)
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#define ret_NOERRNO jrp lr
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#define PSEUDO_END_NOERRNO(name) \
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END (name)
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/* Convenience wrappers. */
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#define SYSCALL__(name, args) PSEUDO (__##name, name, args)
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#define SYSCALL(name, args) PSEUDO (name, name, args)
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#else /* not __ASSEMBLER__ */
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#include <errno.h>
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/* Define a macro which expands inline into the wrapper code for a system
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call. */
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# undef INLINE_SYSCALL
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# define INLINE_SYSCALL(name, nr, args...) \
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({ \
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INTERNAL_SYSCALL_DECL (_sc_err); \
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unsigned long _sc_val = INTERNAL_SYSCALL (name, _sc_err, nr, args); \
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if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sc_val, _sc_err), 0)) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (_sc_val, _sc_err)); \
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_sc_val = -1; \
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} \
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(long) _sc_val; \
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})
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL(name, err, nr, args...) \
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internal_syscall##nr (SYS_ify (name), err, args)
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#undef INTERNAL_SYSCALL_NCS
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#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
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internal_syscall##nr (number, err, args)
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#undef INTERNAL_SYSCALL_DECL
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#define INTERNAL_SYSCALL_DECL(err) int err
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val, err) ({ (void) (val); (err) != 0; })
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#undef INTERNAL_SYSCALL_ERRNO
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#define INTERNAL_SYSCALL_ERRNO(val, err) ({ (void) (val); (err); })
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#define internal_syscall0(num, err, dummy...) \
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({ \
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long _sys_result, __SYSCALL_CLOBBER_DECLS; \
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__asm__ __volatile__ ( \
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"swint1" \
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: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
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: "R10" (num) \
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: __SYSCALL_CLOBBERS); \
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_sys_result; \
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})
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#define internal_syscall1(num, err, arg0) \
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({ \
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long _sys_result, __SYSCALL_CLOBBER_DECLS; \
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__asm__ __volatile__ ( \
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"swint1" \
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: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
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: "R10" (num), "R00" (arg0) \
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: __SYSCALL_CLOBBERS); \
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_sys_result; \
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})
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#define internal_syscall2(num, err, arg0, arg1) \
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({ \
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long _sys_result, __SYSCALL_CLOBBER_DECLS; \
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__asm__ __volatile__ ( \
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"swint1" \
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: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
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: "R10" (num), "R00" (arg0), "R01" (arg1) \
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: __SYSCALL_CLOBBERS); \
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_sys_result; \
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})
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#define internal_syscall3(num, err, arg0, arg1, arg2) \
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({ \
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long _sys_result, __SYSCALL_CLOBBER_DECLS; \
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__asm__ __volatile__ ( \
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"swint1" \
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: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
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: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2) \
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: __SYSCALL_CLOBBERS); \
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_sys_result; \
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})
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#define internal_syscall4(num, err, arg0, arg1, arg2, arg3) \
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({ \
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long _sys_result, __SYSCALL_CLOBBER_DECLS; \
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__asm__ __volatile__ ( \
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"swint1" \
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: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
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: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
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"R03" (arg3) \
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: __SYSCALL_CLOBBERS); \
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_sys_result; \
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})
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#define internal_syscall5(num, err, arg0, arg1, arg2, arg3, arg4) \
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({ \
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long _sys_result, __SYSCALL_CLOBBER_DECLS; \
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__asm__ __volatile__ ( \
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"swint1" \
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: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
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: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
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"R03" (arg3), "R04" (arg4) \
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: __SYSCALL_CLOBBERS); \
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_sys_result; \
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})
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#define internal_syscall6(num, err, arg0, arg1, arg2, arg3, arg4, arg5) \
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({ \
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long _sys_result, __SYSCALL_CLOBBER_DECLS; \
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__asm__ __volatile__ ( \
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"swint1" \
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: "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS \
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: "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2), \
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"R03" (arg3), "R04" (arg4), "R05" (arg5) \
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: __SYSCALL_CLOBBERS); \
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_sys_result; \
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})
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#undef __SYSCALL_CLOBBERS
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#define __SYSCALL_CLOBBERS \
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"r6", "r7", \
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"r8", "r9", "r11", "r12", "r13", "r14", "r15", \
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"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", \
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"r24", "r25", "r26", "r27", "r28", "r29", "memory"
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/* gcc doesn't seem to allow an input operand to be clobbered, so we
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fake it with dummy outputs. */
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#define __SYSCALL_CLOBBER_DECLS \
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_clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10
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#define __SYSCALL_CLOBBER_OUTPUTS \
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"=R02" (_clobber_r2), "=R03" (_clobber_r3), "=R04" (_clobber_r4), \
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"=R05" (_clobber_r5), "=R10" (_clobber_r10)
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#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
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({ \
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struct syscall_return_value _sc_rv = funcptr (args); \
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err = _sc_rv.error; \
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_sc_rv.value; \
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})
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/* List of system calls which are supported as vsyscalls. */
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#define HAVE_CLOCK_GETTIME_VSYSCALL 1
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#define HAVE_GETTIMEOFDAY_VSYSCALL 1
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#endif /* __ASSEMBLER__ */
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/* Pointer mangling support. */
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#if IS_IN (rtld)
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/* We cannot use the thread descriptor because in ld.so we use setjmp
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earlier than the descriptor is initialized. */
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#else
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# ifdef __ASSEMBLER__
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# define PTR_MANGLE(reg, tmpreg) \
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ADDLI_PTR tmpreg, pt, POINTER_GUARD; \
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LD tmpreg, tmpreg; \
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xor reg, tmpreg, reg
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# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
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# else
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# define PTR_MANGLE(var) \
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(var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
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# define PTR_DEMANGLE(var) PTR_MANGLE (var)
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# endif
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#endif
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