| /* Copyright (C) 1992-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995. |
| Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>. |
| |
| 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _LINUX_SH_SYSDEP_H |
| #define _LINUX_SH_SYSDEP_H 1 |
| |
| /* There is some commonality. */ |
| #include <sysdeps/unix/sysv/linux/sysdep.h> |
| #include <sysdeps/unix/sh/sysdep.h> |
| #include <tls.h> |
| |
| /* For Linux we can use the system call table in the header file |
| /usr/include/asm/unistd.h |
| of the kernel. But these symbols do not follow the SYS_* syntax |
| so we have to redefine the `SYS_ify' macro here. */ |
| #undef SYS_ify |
| #define SYS_ify(syscall_name) (__NR_##syscall_name) |
| |
| |
| #ifdef __ASSEMBLER__ |
| |
| /* 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 savely |
| test with -4095. */ |
| |
| #define _IMM1 #-1 |
| #define _IMM12 #-12 |
| #undef PSEUDO |
| #define PSEUDO(name, syscall_name, args) \ |
| .text; \ |
| ENTRY (name); \ |
| DO_CALL (syscall_name, args); \ |
| mov r0,r1; \ |
| mov _IMM12,r2; \ |
| shad r2,r1; \ |
| not r1,r1; \ |
| tst r1,r1; \ |
| bf .Lpseudo_end; \ |
| SYSCALL_ERROR_HANDLER; \ |
| .Lpseudo_end: |
| |
| #undef PSEUDO_END |
| #define PSEUDO_END(name) \ |
| END (name) |
| |
| #undef PSEUDO_NOERRNO |
| #define PSEUDO_NOERRNO(name, syscall_name, args) \ |
| .text; \ |
| ENTRY (name); \ |
| DO_CALL (syscall_name, args) |
| |
| #undef PSEUDO_END_NOERRNO |
| #define PSEUDO_END_NOERRNO(name) \ |
| END (name) |
| |
| #define ret_NOERRNO ret |
| |
| #define PSEUDO_ERRVAL(name, syscall_name, args) \ |
| .text; \ |
| ENTRY (name); \ |
| DO_CALL (syscall_name, args); |
| |
| #undef PSEUDO_END_ERRVAL |
| #define PSEUDO_END_ERRVAL(name) \ |
| END (name) |
| |
| #define ret_ERRVAL ret |
| |
| #ifndef PIC |
| # define SYSCALL_ERROR_HANDLER \ |
| mov.l 0f,r1; \ |
| jmp @r1; \ |
| mov r0,r4; \ |
| .align 2; \ |
| 0: .long __syscall_error |
| #else |
| # if RTLD_PRIVATE_ERRNO |
| # define SYSCALL_ERROR_HANDLER \ |
| neg r0,r1; \ |
| mov r12,r2; \ |
| cfi_register (r12, r2); \ |
| mov.l 0f,r12; \ |
| mova 0f,r0; \ |
| add r0,r12; \ |
| mov.l 1f,r0; \ |
| mov.l r1,@(r0,r12); \ |
| mov r2,r12; \ |
| cfi_restore (r12); \ |
| bra .Lpseudo_end; \ |
| mov _IMM1,r0; \ |
| .align 2; \ |
| 0: .long _GLOBAL_OFFSET_TABLE_; \ |
| 1: .long rtld_errno@GOTOFF |
| |
| # elif defined _LIBC_REENTRANT |
| |
| # if IS_IN (libc) |
| # define SYSCALL_ERROR_ERRNO __libc_errno |
| # else |
| # define SYSCALL_ERROR_ERRNO errno |
| # endif |
| # define SYSCALL_ERROR_HANDLER \ |
| neg r0,r1; \ |
| mov r12,r2; \ |
| cfi_register (r12, r2); \ |
| mov.l 0f,r12; \ |
| mova 0f,r0; \ |
| add r0,r12; \ |
| mov.l 1f,r0; \ |
| stc gbr, r4; \ |
| mov.l @(r0,r12),r0; \ |
| mov r2,r12; \ |
| cfi_restore (r12); \ |
| add r4,r0; \ |
| mov.l r1,@r0; \ |
| bra .Lpseudo_end; \ |
| mov _IMM1,r0; \ |
| .align 2; \ |
| 0: .long _GLOBAL_OFFSET_TABLE_; \ |
| 1: .long SYSCALL_ERROR_ERRNO@GOTTPOFF |
| # else |
| /* Store (-r0) into errno through the GOT. */ |
| # define SYSCALL_ERROR_HANDLER \ |
| neg r0,r1; \ |
| mov r12,r2; \ |
| cfi_register (r12, r2); \ |
| mov.l 0f,r12; \ |
| mova 0f,r0; \ |
| add r0,r12; \ |
| mov.l 1f,r0; \ |
| mov.l @(r0,r12),r0; \ |
| mov r2,r12; \ |
| cfi_restore (r12); \ |
| mov.l r1,@r0; \ |
| bra .Lpseudo_end; \ |
| mov _IMM1,r0; \ |
| .align 2; \ |
| 0: .long _GLOBAL_OFFSET_TABLE_; \ |
| 1: .long errno@GOT |
| # endif /* _LIBC_REENTRANT */ |
| #endif /* PIC */ |
| |
| # ifdef NEED_SYSCALL_INST_PAD |
| # define SYSCALL_INST_PAD \ |
| or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0 |
| # else |
| # define SYSCALL_INST_PAD |
| # endif |
| |
| #define SYSCALL_INST0 trapa #0x10 |
| #define SYSCALL_INST1 trapa #0x11 |
| #define SYSCALL_INST2 trapa #0x12 |
| #define SYSCALL_INST3 trapa #0x13 |
| #define SYSCALL_INST4 trapa #0x14 |
| #define SYSCALL_INST5 mov.l @(0,r15),r0; trapa #0x15 |
| #define SYSCALL_INST6 mov.l @(0,r15),r0; mov.l @(4,r15),r1; trapa #0x16 |
| |
| #undef DO_CALL |
| #define DO_CALL(syscall_name, args) \ |
| mov.l 1f,r3; \ |
| SYSCALL_INST##args; \ |
| SYSCALL_INST_PAD; \ |
| bra 2f; \ |
| nop; \ |
| .align 2; \ |
| 1: .long SYS_ify (syscall_name); \ |
| 2: |
| |
| #else /* not __ASSEMBLER__ */ |
| |
| #define SYSCALL_INST_STR0 "trapa #0x10\n\t" |
| #define SYSCALL_INST_STR1 "trapa #0x11\n\t" |
| #define SYSCALL_INST_STR2 "trapa #0x12\n\t" |
| #define SYSCALL_INST_STR3 "trapa #0x13\n\t" |
| #define SYSCALL_INST_STR4 "trapa #0x14\n\t" |
| #define SYSCALL_INST_STR5 "trapa #0x15\n\t" |
| #define SYSCALL_INST_STR6 "trapa #0x16\n\t" |
| |
| # ifdef NEED_SYSCALL_INST_PAD |
| # define SYSCALL_INST_PAD "\ |
| or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0" |
| # else |
| # define SYSCALL_INST_PAD |
| # endif |
| |
| #define ASMFMT_0 |
| #define ASMFMT_1 \ |
| , "r" (r4) |
| #define ASMFMT_2 \ |
| , "r" (r4), "r" (r5) |
| #define ASMFMT_3 \ |
| , "r" (r4), "r" (r5), "r" (r6) |
| #define ASMFMT_4 \ |
| , "r" (r4), "r" (r5), "r" (r6), "r" (r7) |
| #define ASMFMT_5 \ |
| , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0) |
| #define ASMFMT_6 \ |
| , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1) |
| #define ASMFMT_7 \ |
| , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1), "r" (r2) |
| |
| #define SUBSTITUTE_ARGS_0() |
| #define SUBSTITUTE_ARGS_1(arg1) \ |
| long int _arg1 = (long int) (arg1); \ |
| register long int r4 asm ("%r4") = (long int) (_arg1) |
| #define SUBSTITUTE_ARGS_2(arg1, arg2) \ |
| long int _arg1 = (long int) (arg1); \ |
| long int _arg2 = (long int) (arg2); \ |
| register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| register long int r5 asm ("%r5") = (long int) (_arg2) |
| #define SUBSTITUTE_ARGS_3(arg1, arg2, arg3) \ |
| long int _arg1 = (long int) (arg1); \ |
| long int _arg2 = (long int) (arg2); \ |
| long int _arg3 = (long int) (arg3); \ |
| register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| register long int r6 asm ("%r6") = (long int) (_arg3) |
| #define SUBSTITUTE_ARGS_4(arg1, arg2, arg3, arg4) \ |
| long int _arg1 = (long int) (arg1); \ |
| long int _arg2 = (long int) (arg2); \ |
| long int _arg3 = (long int) (arg3); \ |
| long int _arg4 = (long int) (arg4); \ |
| register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| register long int r6 asm ("%r6") = (long int) (_arg3); \ |
| register long int r7 asm ("%r7") = (long int) (_arg4) |
| #define SUBSTITUTE_ARGS_5(arg1, arg2, arg3, arg4, arg5) \ |
| long int _arg1 = (long int) (arg1); \ |
| long int _arg2 = (long int) (arg2); \ |
| long int _arg3 = (long int) (arg3); \ |
| long int _arg4 = (long int) (arg4); \ |
| long int _arg5 = (long int) (arg5); \ |
| register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| register long int r6 asm ("%r6") = (long int) (_arg3); \ |
| register long int r7 asm ("%r7") = (long int) (_arg4); \ |
| register long int r0 asm ("%r0") = (long int) (_arg5) |
| #define SUBSTITUTE_ARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \ |
| long int _arg1 = (long int) (arg1); \ |
| long int _arg2 = (long int) (arg2); \ |
| long int _arg3 = (long int) (arg3); \ |
| long int _arg4 = (long int) (arg4); \ |
| long int _arg5 = (long int) (arg5); \ |
| long int _arg6 = (long int) (arg6); \ |
| register long int r4 asm ("%r4") = (long int)(_arg1); \ |
| register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| register long int r6 asm ("%r6") = (long int) (_arg3); \ |
| register long int r7 asm ("%r7") = (long int) (_arg4); \ |
| register long int r0 asm ("%r0") = (long int) (_arg5); \ |
| register long int r1 asm ("%r1") = (long int) (_arg6) |
| #define SUBSTITUTE_ARGS_7(arg1, arg2, arg3, arg4, arg5, arg6, arg7) \ |
| long int _arg1 = (long int) (arg1); \ |
| long int _arg2 = (long int) (arg2); \ |
| long int _arg3 = (long int) (arg3); \ |
| long int _arg4 = (long int) (arg4); \ |
| long int _arg5 = (long int) (arg5); \ |
| long int _arg6 = (long int) (arg6); \ |
| long int _arg7 = (long int) (arg7); \ |
| register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| register long int r6 asm ("%r6") = (long int) (_arg3); \ |
| register long int r7 asm ("%r7") = (long int) (_arg4); \ |
| register long int r0 asm ("%r0") = (long int) (_arg5); \ |
| register long int r1 asm ("%r1") = (long int) (_arg6); \ |
| register long int r2 asm ("%r2") = (long int) (_arg7) |
| |
| #undef INLINE_SYSCALL |
| #define INLINE_SYSCALL(name, nr, args...) \ |
| ({ \ |
| unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args); \ |
| if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (resultvar, ), 0)) \ |
| { \ |
| __set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, )); \ |
| resultvar = 0xffffffff; \ |
| } \ |
| (int) resultvar; }) |
| |
| #undef INTERNAL_SYSCALL |
| #define INTERNAL_SYSCALL(name, err, nr, args...) \ |
| ({ \ |
| unsigned long int resultvar; \ |
| register long int r3 asm ("%r3") = SYS_ify (name); \ |
| SUBSTITUTE_ARGS_##nr(args); \ |
| \ |
| asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD \ |
| : "=z" (resultvar) \ |
| : "r" (r3) ASMFMT_##nr \ |
| : "memory", "t"); \ |
| \ |
| (int) resultvar; }) |
| |
| /* The _NCS variant allows non-constant syscall numbers. */ |
| #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ |
| ({ \ |
| unsigned long int resultvar; \ |
| register long int r3 asm ("%r3") = (name); \ |
| SUBSTITUTE_ARGS_##nr(args); \ |
| \ |
| asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD \ |
| : "=z" (resultvar) \ |
| : "r" (r3) ASMFMT_##nr \ |
| : "memory", "t"); \ |
| \ |
| (int) resultvar; }) |
| |
| #undef INTERNAL_SYSCALL_DECL |
| #define INTERNAL_SYSCALL_DECL(err) do { } while (0) |
| |
| #undef INTERNAL_SYSCALL_ERROR_P |
| #define INTERNAL_SYSCALL_ERROR_P(val, err) \ |
| ((unsigned int) (val) >= 0xfffff001u) |
| |
| #undef INTERNAL_SYSCALL_ERRNO |
| #define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) |
| |
| #endif /* __ASSEMBLER__ */ |
| |
| /* Pointer mangling support. */ |
| #if IS_IN (rtld) |
| /* We cannot use the thread descriptor because in ld.so we use setjmp |
| earlier than the descriptor is initialized. Using a global variable |
| is too complicated here since we have no PC-relative addressing mode. */ |
| #else |
| # ifdef __ASSEMBLER__ |
| # define PTR_MANGLE(reg, tmp) \ |
| stc gbr,tmp; mov.l @(POINTER_GUARD,tmp),tmp; xor tmp,reg |
| # define PTR_MANGLE2(reg, tmp) xor tmp,reg |
| # define PTR_DEMANGLE(reg, tmp) PTR_MANGLE (reg, tmp) |
| # define PTR_DEMANGLE2(reg, tmp) PTR_MANGLE2 (reg, tmp) |
| # else |
| # define PTR_MANGLE(var) \ |
| (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ()) |
| # define PTR_DEMANGLE(var) PTR_MANGLE (var) |
| # endif |
| #endif |
| |
| #endif /* linux/sh/sysdep.h */ |