| /* Copyright (C) 1992, 93, 1995-2000, 2002, 2003, 2005, 2006, 2009 |
| Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995. |
| ARM changes by Philip Blundell, <pjb27@cam.ac.uk>, May 1997. |
| |
| 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #ifndef _LINUX_ARM_SYSDEP_H |
| #define _LINUX_ARM_SYSDEP_H 1 |
| |
| /* There is some commonality. */ |
| #include <sysdeps/unix/arm/sysdep.h> |
| |
| /* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO. */ |
| #include <dl-sysdep.h> |
| |
| #include <tls.h> |
| |
| /* In order to get __set_errno() definition in INLINE_SYSCALL. */ |
| #ifndef __ASSEMBLER__ |
| #include <errno.h> |
| #endif |
| |
| /* 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 SWI_BASE (0x900000) |
| #define SYS_ify(syscall_name) (__NR_##syscall_name) |
| |
| |
| /* The following must match the kernel's <asm/procinfo.h>. */ |
| #define HWCAP_ARM_SWP 1 |
| #define HWCAP_ARM_HALF 2 |
| #define HWCAP_ARM_THUMB 4 |
| #define HWCAP_ARM_26BIT 8 |
| #define HWCAP_ARM_FAST_MULT 16 |
| #define HWCAP_ARM_FPA 32 |
| #define HWCAP_ARM_VFP 64 |
| #define HWCAP_ARM_EDSP 128 |
| #define HWCAP_ARM_JAVA 256 |
| #define HWCAP_ARM_IWMMXT 512 |
| |
| #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 safely |
| test with -4095. */ |
| |
| #undef PSEUDO |
| #define PSEUDO(name, syscall_name, args) \ |
| .text; \ |
| ENTRY (name); \ |
| DO_CALL (syscall_name, args); \ |
| cmn r0, $4096; |
| |
| #define PSEUDO_RET \ |
| RETINSTR(cc, lr); \ |
| b PLTJMP(SYSCALL_ERROR) |
| #undef ret |
| #define ret PSEUDO_RET |
| |
| #undef PSEUDO_END |
| #define PSEUDO_END(name) \ |
| SYSCALL_ERROR_HANDLER \ |
| END (name) |
| |
| #undef PSEUDO_NOERRNO |
| #define PSEUDO_NOERRNO(name, syscall_name, args) \ |
| .text; \ |
| ENTRY (name); \ |
| DO_CALL (syscall_name, args); |
| |
| #define PSEUDO_RET_NOERRNO \ |
| DO_RET (lr); |
| |
| #undef ret_NOERRNO |
| #define ret_NOERRNO PSEUDO_RET_NOERRNO |
| |
| #undef PSEUDO_END_NOERRNO |
| #define PSEUDO_END_NOERRNO(name) \ |
| END (name) |
| |
| /* The function has to return the error code. */ |
| #undef PSEUDO_ERRVAL |
| #define PSEUDO_ERRVAL(name, syscall_name, args) \ |
| .text; \ |
| ENTRY (name) \ |
| DO_CALL (syscall_name, args); \ |
| rsb r0, r0, #0 |
| |
| #undef PSEUDO_END_ERRVAL |
| #define PSEUDO_END_ERRVAL(name) \ |
| END (name) |
| |
| #define ret_ERRVAL PSEUDO_RET_NOERRNO |
| |
| #if NOT_IN_libc |
| # define SYSCALL_ERROR __local_syscall_error |
| # if RTLD_PRIVATE_ERRNO |
| # define SYSCALL_ERROR_HANDLER \ |
| __local_syscall_error: \ |
| ldr r1, 1f; \ |
| rsb r0, r0, #0; \ |
| 0: str r0, [pc, r1]; \ |
| mvn r0, #0; \ |
| DO_RET(lr); \ |
| 1: .word C_SYMBOL_NAME(rtld_errno) - 0b - 8; |
| # else |
| #if defined(__ARM_ARCH_4T__) && defined(__THUMB_INTERWORK__) |
| #define POP_PC ldr lr, [sp], #4; bx lr |
| #else |
| #define POP_PC ldr pc, [sp], #4 |
| #endif |
| # define SYSCALL_ERROR_HANDLER \ |
| __local_syscall_error: \ |
| str lr, [sp, #-4]!; \ |
| str r0, [sp, #-4]!; \ |
| bl PLTJMP(C_SYMBOL_NAME(__errno_location)); \ |
| ldr r1, [sp], #4; \ |
| rsb r1, r1, #0; \ |
| str r1, [r0]; \ |
| mvn r0, #0; \ |
| POP_PC; |
| # endif |
| #else |
| # define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */ |
| # define SYSCALL_ERROR __syscall_error |
| #endif |
| |
| /* Linux takes system call args in registers: |
| syscall number in the SWI instruction |
| arg 1 r0 |
| arg 2 r1 |
| arg 3 r2 |
| arg 4 r3 |
| arg 5 r4 (this is different from the APCS convention) |
| arg 6 r5 |
| arg 7 r6 |
| |
| The compiler is going to form a call by coming here, through PSEUDO, with |
| arguments |
| syscall number in the DO_CALL macro |
| arg 1 r0 |
| arg 2 r1 |
| arg 3 r2 |
| arg 4 r3 |
| arg 5 [sp] |
| arg 6 [sp+4] |
| arg 7 [sp+8] |
| |
| We need to shuffle values between R4..R6 and the stack so that the |
| caller's v1..v3 and stack frame are not corrupted, and the kernel |
| sees the right arguments. |
| |
| */ |
| |
| #undef DO_CALL |
| #define DO_CALL(syscall_name, args) \ |
| DOARGS_##args \ |
| swi SYS_ify (syscall_name); \ |
| UNDOARGS_##args |
| |
| #define DOARGS_0 /* nothing */ |
| #define DOARGS_1 /* nothing */ |
| #define DOARGS_2 /* nothing */ |
| #define DOARGS_3 /* nothing */ |
| #define DOARGS_4 /* nothing */ |
| #define DOARGS_5 str r4, [sp, $-4]!; ldr r4, [sp, $4]; |
| #define DOARGS_6 mov ip, sp; stmfd sp!, {r4, r5}; ldmia ip, {r4, r5}; |
| #define DOARGS_7 mov ip, sp; stmfd sp!, {r4, r5, r6}; ldmia ip, {r4, r5, r6}; |
| |
| #define UNDOARGS_0 /* nothing */ |
| #define UNDOARGS_1 /* nothing */ |
| #define UNDOARGS_2 /* nothing */ |
| #define UNDOARGS_3 /* nothing */ |
| #define UNDOARGS_4 /* nothing */ |
| #define UNDOARGS_5 ldr r4, [sp], $4; |
| #define UNDOARGS_6 ldmfd sp!, {r4, r5}; |
| #define UNDOARGS_7 ldmfd sp!, {r4, r5, r6}; |
| |
| #else /* not __ASSEMBLER__ */ |
| |
| /* Define a macro which expands into the inline wrapper code for a system |
| call. */ |
| #undef INLINE_SYSCALL |
| #define INLINE_SYSCALL(name, nr, args...) \ |
| ({ unsigned int _sys_result = INTERNAL_SYSCALL (name, , nr, args); \ |
| if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0)) \ |
| { \ |
| __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, )); \ |
| _sys_result = (unsigned int) -1; \ |
| } \ |
| (int) _sys_result; }) |
| |
| #undef INTERNAL_SYSCALL_DECL |
| #define INTERNAL_SYSCALL_DECL(err) do { } while (0) |
| |
| #undef INTERNAL_SYSCALL_RAW |
| #define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \ |
| ({ unsigned int _sys_result; \ |
| { \ |
| register int _a1 asm ("a1"); \ |
| LOAD_ARGS_##nr (args) \ |
| asm volatile ("swi %1 @ syscall " #name \ |
| : "=r" (_a1) \ |
| : "i" (name) ASM_ARGS_##nr \ |
| : "memory"); \ |
| _sys_result = _a1; \ |
| } \ |
| (int) _sys_result; }) |
| |
| #undef INTERNAL_SYSCALL |
| #define INTERNAL_SYSCALL(name, err, nr, args...) \ |
| INTERNAL_SYSCALL_RAW(SYS_ify(name), err, nr, args) |
| |
| #undef INTERNAL_SYSCALL_ARM |
| #define INTERNAL_SYSCALL_ARM(name, err, nr, args...) \ |
| INTERNAL_SYSCALL_RAW(__ARM_NR_##name, err, nr, args) |
| |
| #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)) |
| |
| #define LOAD_ARGS_0() |
| #define ASM_ARGS_0 |
| #define LOAD_ARGS_1(a1) \ |
| int _a1tmp = (int) (a1); \ |
| LOAD_ARGS_0 () \ |
| _a1 = _a1tmp; |
| #define ASM_ARGS_1 ASM_ARGS_0, "r" (_a1) |
| #define LOAD_ARGS_2(a1, a2) \ |
| int _a2tmp = (int) (a2); \ |
| LOAD_ARGS_1 (a1) \ |
| register int _a2 asm ("a2") = _a2tmp; |
| #define ASM_ARGS_2 ASM_ARGS_1, "r" (_a2) |
| #define LOAD_ARGS_3(a1, a2, a3) \ |
| int _a3tmp = (int) (a3); \ |
| LOAD_ARGS_2 (a1, a2) \ |
| register int _a3 asm ("a3") = _a3tmp; |
| #define ASM_ARGS_3 ASM_ARGS_2, "r" (_a3) |
| #define LOAD_ARGS_4(a1, a2, a3, a4) \ |
| int _a4tmp = (int) (a4); \ |
| LOAD_ARGS_3 (a1, a2, a3) \ |
| register int _a4 asm ("a4") = _a4tmp; |
| #define ASM_ARGS_4 ASM_ARGS_3, "r" (_a4) |
| #define LOAD_ARGS_5(a1, a2, a3, a4, a5) \ |
| int _v1tmp = (int) (a5); \ |
| LOAD_ARGS_4 (a1, a2, a3, a4) \ |
| register int _v1 asm ("v1") = _v1tmp; |
| #define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1) |
| #define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \ |
| int _v2tmp = (int) (a6); \ |
| LOAD_ARGS_5 (a1, a2, a3, a4, a5) \ |
| register int _v2 asm ("v2") = _v2tmp; |
| #define ASM_ARGS_6 ASM_ARGS_5, "r" (_v2) |
| #define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \ |
| int _v3tmp = (int) (a7); \ |
| LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6) \ |
| register int _v3 asm ("v3") = _v3tmp; |
| #define ASM_ARGS_7 ASM_ARGS_6, "r" (_v3) |
| |
| /* We can't implement non-constant syscalls directly since the syscall |
| number is normally encoded in the instruction. So use SYS_syscall. */ |
| #define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ |
| INTERNAL_SYSCALL_NCS_##nr (number, err, args) |
| |
| #define INTERNAL_SYSCALL_NCS_0(number, err, args...) \ |
| INTERNAL_SYSCALL (syscall, err, 1, number, args) |
| #define INTERNAL_SYSCALL_NCS_1(number, err, args...) \ |
| INTERNAL_SYSCALL (syscall, err, 2, number, args) |
| #define INTERNAL_SYSCALL_NCS_2(number, err, args...) \ |
| INTERNAL_SYSCALL (syscall, err, 3, number, args) |
| #define INTERNAL_SYSCALL_NCS_3(number, err, args...) \ |
| INTERNAL_SYSCALL (syscall, err, 4, number, args) |
| #define INTERNAL_SYSCALL_NCS_4(number, err, args...) \ |
| INTERNAL_SYSCALL (syscall, err, 5, number, args) |
| #define INTERNAL_SYSCALL_NCS_5(number, err, args...) \ |
| INTERNAL_SYSCALL (syscall, err, 6, number, args) |
| |
| #endif /* __ASSEMBLER__ */ |
| |
| /* Pointer mangling is not yet supported for ARM. */ |
| #define PTR_MANGLE(var) (void) (var) |
| #define PTR_DEMANGLE(var) (void) (var) |
| |
| #endif /* linux/arm/sysdep.h */ |