/* Assembler and syscall macros. OpenRISC version. Copyright (C) 2022-2024 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 . */ #ifndef _LINUX_OR1K_SYSDEP_H #define _LINUX_OR1K_SYSDEP_H 1 #include #include #include #include /* "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 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 */