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4f69cc45bc
If a function passes in a variable named "ret", the code will miscompile when it declares a local ret variable. In some cases, it's even a build failure like so: ../sysdeps/unix/sysv/linux/spawni.c: In function '__spawni_child': ../sysdeps/unix/sysv/linux/spawni.c:289:5: error: address of register variable 'ret' requested while (write_not_cancel (p, &ret, sizeof ret) < 0)
314 lines
15 KiB
C
314 lines
15 KiB
C
/* Copyright (C) 2000-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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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#ifndef _LINUX_MICROBLAZE_SYSDEP_H
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#define _LINUX_MICROBLAZE_SYSDEP_H 1
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#include <sysdeps/unix/sysdep.h>
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#include <sysdeps/unix/sysv/linux/sysdep.h>
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#include <sysdeps/microblaze/sysdep.h>
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/* Defines RTLD_PRIVATE_ERRNO. */
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#include <dl-sysdep.h>
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/* In order to get __set_errno() definition in INLINE_SYSCALL. */
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#ifndef __ASSEMBLER__
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# include <errno.h>
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#endif
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/* For Linux we can use the system call table in the header file
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/usr/include/asm/unistd.h
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of the kernel. But these symbols do not follow the SYS_* syntax
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so we have to redefine the `SYS_ify' macro here. */
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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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/* In microblaze ABI function call arguments are passed in registers
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r5...r10. The return value is stored in r3 (or r3:r4 regiters pair).
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Linux syscall uses the same convention with the addition that the
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syscall number is passed in r12. To enter the kernel "brki r14,8"
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instruction is used.
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None of the abovementioned registers are presumed across function call
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or syscall.
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*/
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/* Linux uses a negative return value to indicate syscall errors, unlike
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most Unices, which use the condition codes' carry flag.
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Since version 2.1 the return value of a system call might be negative
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even if the call succeeded. E.g., the `lseek' system call might return
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a large offset. Therefore we must not anymore test for < 0, but test
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for a real error by making sure the value in %d0 is a real error
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number. Linus said he will make sure the no syscall returns a value
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in -1 .. -4095 as a valid result so we can savely test with -4095. */
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/* We don't want the label for the error handler to be visible in the symbol
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table when we define it here. */
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# ifdef PIC
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# define SYSCALL_ERROR_LABEL 0f
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# else
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# define SYSCALL_ERROR_LABEL __syscall_error
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# endif
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# undef PSEUDO
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# define PSEUDO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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addik r12,r0,-4095; \
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cmpu r12,r12,r3; \
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bgei r12,SYSCALL_ERROR_LABEL;
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# undef PSEUDO_END
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# define PSEUDO_END(name) \
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SYSCALL_ERROR_HANDLER; \
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END (name)
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# undef PSEUDO_NOERRNO
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# define PSEUDO_NOERRNO(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args);
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# undef PSEUDO_END_NOERRNO
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# define PSEUDO_END_NOERRNO(name) \
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END (name)
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/* The function has to return the error code. */
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# undef PSEUDO_ERRVAL
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# define PSEUDO_ERRVAL(name, syscall_name, args) \
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.text; \
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ENTRY (name) \
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DO_CALL (syscall_name, args); \
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# undef PSEUDO_END_ERRVAL
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# define PSEUDO_END_ERRVAL(name) \
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END (name)
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# define ret_NOERRNO \
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rtsd r15,8; addk r0,r0,r0;
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# define ret_ERRVAL \
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rtsd r15,8; rsubk r3,r3,r0;
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# ifdef PIC
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# define SYSCALL_ERROR_LABEL_DCL 0
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# if RTLD_PRIVATE_ERRNO
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# define SYSCALL_ERROR_HANDLER \
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SYSCALL_ERROR_LABEL_DCL: \
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mfs r12,rpc; \
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addik r12,r12,_GLOBAL_OFFSET_TABLE_+8; \
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lwi r12,r12,rtld_errno@GOT; \
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rsubk r3,r3,r0; \
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swi r3,r12,0; \
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rtsd r15,8; \
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addik r3,r0,-1;
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# else /* !RTLD_PRIVATE_ERRNO. */
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/* Store (-r3) into errno through the GOT. */
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# if defined _LIBC_REENTRANT
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# define SYSCALL_ERROR_HANDLER \
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SYSCALL_ERROR_LABEL_DCL: \
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addik r1,r1,-16; \
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swi r15,r1,0; \
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swi r20,r1,8; \
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rsubk r3,r3,r0; \
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swi r3,r1,12; \
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mfs r20,rpc; \
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addik r20,r20,_GLOBAL_OFFSET_TABLE_+8; \
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brlid r15,__errno_location@PLT; \
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nop; \
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lwi r4,r1,12; \
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swi r4,r3,0; \
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lwi r20,r1,8; \
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lwi r15,r1,0; \
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addik r1,r1,16; \
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rtsd r15,8; \
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addik r3,r0,-1;
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# else /* !_LIBC_REENTRANT. */
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# define SYSCALL_ERROR_HANDLER \
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SYSCALL_ERROR_LABEL_DCL: \
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mfs r12,rpc; \
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addik r12,r12,_GLOBAL_OFFSET_TABLE_+8; \
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lwi r12,r12,errno@GOT; \
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rsubk r3,r3,r0; \
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swi r3,r12,0; \
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rtsd r15,8; \
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addik r3,r0,-1;
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# endif /* _LIBC_REENTRANT. */
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# endif /* RTLD_PRIVATE_ERRNO. */
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# else
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# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
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# endif /* PIC. */
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# define DO_CALL(syscall_name, args) \
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addik r12,r0,SYS_ify (syscall_name); \
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brki r14,8; \
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addk r0,r0,r0;
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#else /* not __ASSEMBLER__ */
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/* Define a macro which expands into the inline 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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({ INTERNAL_SYSCALL_DECL(err); \
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unsigned long resultvar = INTERNAL_SYSCALL(name, err, nr, args); \
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if (INTERNAL_SYSCALL_ERROR_P (resultvar, err)) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, err)); \
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resultvar = (unsigned long) -1; \
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} \
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(long) resultvar; \
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})
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# undef INTERNAL_SYSCALL_DECL
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# define INTERNAL_SYSCALL_DECL(err) do { } while (0)
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/* Define a macro which expands inline into the wrapper code for a system
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call. This use is for internal calls that do not need to handle errors
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normally. It will never touch errno. This returns just what the kernel
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gave back. */
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# undef INTERNAL_SYSCALL
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# define INTERNAL_SYSCALL(name, err, nr, args...) \
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inline_syscall##nr(SYS_ify(name), args)
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# undef INTERNAL_SYSCALL_NCS
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# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
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inline_syscall##nr(name, args)
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# undef INTERNAL_SYSCALL_ERROR_P
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# define INTERNAL_SYSCALL_ERROR_P(val, err) \
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((unsigned int) (val) >= -4095U)
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# undef INTERNAL_SYSCALL_ERRNO
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# define INTERNAL_SYSCALL_ERRNO(val, err) (-(val))
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# define SYSCALL_CLOBBERS_6 "r11", "r4", "memory"
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# define SYSCALL_CLOBBERS_5 "r10", SYSCALL_CLOBBERS_6
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# define SYSCALL_CLOBBERS_4 "r9", SYSCALL_CLOBBERS_5
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# define SYSCALL_CLOBBERS_3 "r8", SYSCALL_CLOBBERS_4
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# define SYSCALL_CLOBBERS_2 "r7", SYSCALL_CLOBBERS_3
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# define SYSCALL_CLOBBERS_1 "r6", SYSCALL_CLOBBERS_2
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# define SYSCALL_CLOBBERS_0 "r5", SYSCALL_CLOBBERS_1
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# define inline_syscall0(name,dummy) \
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({ \
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register long __ret __asm__("r3"); \
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register long __r12 __asm__("r12") = name; \
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__asm__ __volatile__( "brki r14,8; nop;" \
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: "=r"(__ret) \
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: "r"(__r12) \
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: SYSCALL_CLOBBERS_0 ); __ret; \
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})
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# define inline_syscall1(name,arg1) \
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({ \
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register long __ret __asm__("r3"); \
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register long __r12 __asm__("r12") = name; \
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register long __r5 __asm__("r5") = (long)(arg1); \
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__asm__ __volatile__( "brki r14,8; nop;" \
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: "=r"(__ret) \
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: "r"(__r5), "r"(__r12) \
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: SYSCALL_CLOBBERS_1 ); __ret; \
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})
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# define inline_syscall2(name,arg1,arg2) \
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({ \
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register long __ret __asm__("r3"); \
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register long __r12 __asm__("r12") = name; \
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register long __r5 __asm__("r5") = (long)(arg1); \
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register long __r6 __asm__("r6") = (long)(arg2); \
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__asm__ __volatile__( "brki r14,8; nop;" \
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: "=r"(__ret) \
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: "r"(__r5), "r"(__r6), "r"(__r12) \
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: SYSCALL_CLOBBERS_2 ); __ret; \
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})
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# define inline_syscall3(name,arg1,arg2,arg3) \
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({ \
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register long __ret __asm__("r3"); \
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register long __r12 __asm__("r12") = name; \
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register long __r5 __asm__("r5") = (long)(arg1); \
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register long __r6 __asm__("r6") = (long)(arg2); \
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register long __r7 __asm__("r7") = (long)(arg3); \
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__asm__ __volatile__( "brki r14,8; nop;" \
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: "=r"(__ret) \
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: "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r12) \
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: SYSCALL_CLOBBERS_3 ); __ret; \
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})
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# define inline_syscall4(name,arg1,arg2,arg3,arg4) \
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({ \
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register long __ret __asm__("r3"); \
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register long __r12 __asm__("r12") = name; \
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register long __r5 __asm__("r5") = (long)(arg1); \
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register long __r6 __asm__("r6") = (long)(arg2); \
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register long __r7 __asm__("r7") = (long)(arg3); \
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register long __r8 __asm__("r8") = (long)(arg4); \
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__asm__ __volatile__( "brki r14,8; nop;" \
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: "=r"(__ret) \
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: "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r12) \
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: SYSCALL_CLOBBERS_4 ); __ret; \
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})
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# define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5) \
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({ \
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register long __ret __asm__("r3"); \
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register long __r12 __asm__("r12") = name; \
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register long __r5 __asm__("r5") = (long)(arg1); \
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register long __r6 __asm__("r6") = (long)(arg2); \
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register long __r7 __asm__("r7") = (long)(arg3); \
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register long __r8 __asm__("r8") = (long)(arg4); \
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register long __r9 __asm__("r9") = (long)(arg5); \
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__asm__ __volatile__( "brki r14,8; nop;" \
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: "=r"(__ret) \
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: "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r9), "r"(__r12) \
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: SYSCALL_CLOBBERS_5 ); __ret; \
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})
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# define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6) \
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({ \
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register long __ret __asm__("r3"); \
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register long __r12 __asm__("r12") = name; \
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register long __r5 __asm__("r5") = (long)(arg1); \
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register long __r6 __asm__("r6") = (long)(arg2); \
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register long __r7 __asm__("r7") = (long)(arg3); \
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register long __r8 __asm__("r8") = (long)(arg4); \
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register long __r9 __asm__("r9") = (long)(arg5); \
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register long __r10 __asm__("r10") = (long)(arg6); \
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__asm__ __volatile__( "brki r14,8; nop;" \
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: "=r"(__ret) \
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: "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r9), "r"(__r10), \
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"r"(__r12) \
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: SYSCALL_CLOBBERS_6 ); __ret; \
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})
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/* Pointer mangling is not yet supported for Microblaze. */
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# define PTR_MANGLE(var) (void) (var)
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# define PTR_DEMANGLE(var) (void) (var)
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#endif /* not __ASSEMBLER__ */
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#endif /* _LINUX_MICROBLAZE_SYSDEP_H */
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