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glibc/sysdeps/unix/sysv/linux/or1k/sysdep.h
Florian Weimer 88f4b6929c Introduce <pointer_guard.h>, extracted from <sysdep.h> 
This allows us to define a generic no-op version of PTR_MANGLE and
PTR_DEMANGLE.  In the future, we can use PTR_MANGLE and PTR_DEMANGLE
unconditionally in C sources, avoiding an unintended loss of hardening
due to missing include files or unlucky header inclusion ordering.

In i386 and x86_64, we can avoid a <tls.h> dependency in the C
code by using the computed constant from <tcb-offsets.h>.  <sysdep.h>
no longer includes these definitions, so there is no cyclic dependency
anymore when computing the <tcb-offsets.h> constants.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2022-10-18 17:03:55 +02:00

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/* Assembler and syscall macros. OpenRISC version.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#ifndef _LINUX_OR1K_SYSDEP_H
#define _LINUX_OR1K_SYSDEP_H 1
#include <sysdeps/or1k/sysdep.h>
#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
#include <tls.h>
/* "workarounds" for generic code needing to handle 64-bit time_t. */
#undef __NR_clock_getres
#undef __NR_futex
#undef __NR_ppoll
#undef __NR_pselect6
#undef __NR_recvmmsg
#undef __NR_rt_sigtimedwait
#undef __NR_semtimedop
#undef __NR_utimensat
/* Fix sysdeps/unix/sysv/linux/clock_getcpuclockid.c. */
#define __NR_clock_getres __NR_clock_getres_time64
/* Fix sysdeps/nptl/lowlevellock-futex.h. */
#define __NR_futex __NR_futex_time64
/* Fix sysdeps/unix/sysv/linux/pause.c. */
#define __NR_ppoll __NR_ppoll_time64
/* Fix sysdeps/unix/sysv/linux/select.c. */
#define __NR_pselect6 __NR_pselect6_time64
/* Fix sysdeps/unix/sysv/linux/recvmmsg.c. */
#define __NR_recvmmsg __NR_recvmmsg_time64
/* Fix sysdeps/unix/sysv/linux/sigtimedwait.c. */
#define __NR_rt_sigtimedwait __NR_rt_sigtimedwait_time64
/* Fix sysdeps/unix/sysv/linux/semtimedop.c. */
#define __NR_semtimedop __NR_semtimedop_time64
/* Hack sysdeps/unix/sysv/linux/generic/utimes.c. */
#define __NR_utimensat __NR_utimensat_time64
#undef SYS_ify
#define SYS_ify(syscall_name) (__NR_##syscall_name)
/* Linux uses a negative return value to indicate syscall errors,
unlike most Unices, which use the condition codes' carry flag.
Since version 2.1 the return value of a system call might be
negative even if the call succeeded. E.g., the lseek system call
might return a large offset. Therefore we must not anymore test
for < 0, but test for a real error by making sure the value in R0
is a real error number. Linus said he will make sure the no syscall
returns a value in -1 .. -4095 as a valid result so we can safely
test with -4095. */
#ifdef __ASSEMBLER__
/* Macros used in syscall-template.S */
#define ret l.jr r9; l.nop
#define ret_NOERRNO l.jr r9; l.nop
#undef DO_CALL
#define DO_CALL(syscall_name) \
l.addi r11, r0, SYS_ify (syscall_name); \
l.sys 1; \
l.nop
#undef PSEUDO
#define PSEUDO(name, syscall_name, args) \
ENTRY (name); \
DO_CALL(syscall_name); \
/* if -4096 < ret < 0 holds, it's an error */ \
l.sfgeui r11, 0xf001; \
l.bf L(pseudo_end); \
l.nop
#undef PSEUDO_NOERRNO
#define PSEUDO_NOERRNO(name, syscall_name, args) \
ENTRY (name); \
DO_CALL(syscall_name)
#undef PSEUDO_END
#define PSEUDO_END(name) \
L(pseudo_end): \
l.j SYSCALL_ERROR_NAME; \
l.ori r3,r11,0; \
END (name)
#undef PSEUDO_END_NOERRNO
#define PSEUDO_END_NOERRNO(name) \
END (name)
#ifndef PIC
/* For static code, on error jump to __syscall_error directly. */
# define SYSCALL_ERROR_NAME __syscall_error
#elif !IS_IN (libc)
/* Use the internal name for libc shared objects. */
# define SYSCALL_ERROR_NAME __GI___syscall_error
#else
/* Otherwise, on error do a full PLT jump. */
# define SYSCALL_ERROR_NAME plt(__syscall_error)
#endif
#else /* not __ASSEMBLER__ */
#include <errno.h>
extern long int __syscall_error (long int neg_errno);
#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, nr, args...) \
INTERNAL_SYSCALL_NCS (SYS_ify (name), nr, args)
/* The _NCS variant allows non-constant syscall numbers. */
#undef INTERNAL_SYSCALL_NCS
#define INTERNAL_SYSCALL_NCS(number, nr, args...) \
({ unsigned long int __sys_result; \
{ \
long int _sc_ret = (long int) number; \
LOAD_ARGS_##nr (args) \
register long int __sc_ret __asm__ ("r11") = _sc_ret; \
__asm__ __volatile__ ("l.sys 1\n\t" \
" l.nop\n\t" \
: "+r" (__sc_ret) \
: ASM_ARGS_##nr \
: ASM_CLOBBERS_##nr \
"r12", "r13", "r15", "r17", "r19", \
"r21", "r23", "r25", "r27", "r29", \
"r31", "memory"); \
__sys_result = __sc_ret; \
} \
(long int) __sys_result; })
/* From here on we have nested macros that generate code for
setting up syscall arguments. */
#define LOAD_ARGS_0()
#define ASM_ARGS_0
#define ASM_CLOBBERS_0 "r3", ASM_CLOBBERS_1
#define LOAD_ARGS_1(a) \
long int _a = (long int)(a); \
register long int __a __asm__ ("r3") = _a;
#define ASM_ARGS_1 "r" (__a)
#define ASM_CLOBBERS_1 "r4", ASM_CLOBBERS_2
#define LOAD_ARGS_2(a, b) \
long int _b = (long int)(b); \
LOAD_ARGS_1 (a) \
register long int __b __asm__ ("r4") = _b;
#define ASM_ARGS_2 ASM_ARGS_1, "r" (__b)
#define ASM_CLOBBERS_2 "r5", ASM_CLOBBERS_3
#define LOAD_ARGS_3(a, b, c) \
long int _c = (long int)(c); \
LOAD_ARGS_2 (a, b) \
register long int __c __asm__ ("r5") = _c;
#define ASM_ARGS_3 ASM_ARGS_2, "r" (__c)
#define ASM_CLOBBERS_3 "r6", ASM_CLOBBERS_4
#define LOAD_ARGS_4(a, b, c, d) \
LOAD_ARGS_3 (a, b, c) \
long int _d = (long int)(d); \
register long int __d __asm__ ("r6") = _d;
#define ASM_ARGS_4 ASM_ARGS_3, "r" (__d)
#define ASM_CLOBBERS_4 "r7", ASM_CLOBBERS_5
#define LOAD_ARGS_5(a, b, c, d, e) \
long int _e = (long int)(e); \
LOAD_ARGS_4 (a, b, c, d) \
register long int __e __asm__ ("r7") = _e;
#define ASM_ARGS_5 ASM_ARGS_4, "r" (__e)
#define ASM_CLOBBERS_5 "r8", ASM_CLOBBERS_6
#define LOAD_ARGS_6(a, b, c, d, e, f) \
long int _f = (long int)(f); \
LOAD_ARGS_5 (a, b, c, d, e) \
register long int __f __asm__ ("r8") = _f;
#define ASM_ARGS_6 ASM_ARGS_5, "r" (__f)
#define ASM_CLOBBERS_6
#endif /* not __ASSEMBLER__ */
#endif /* linux/or1k/sysdep.h */
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