diff options
Diffstat (limited to 'libc/sysdeps/linux')
| -rw-r--r-- | libc/sysdeps/linux/common/Makefile.in | 1 | ||||
| -rw-r--r-- | libc/sysdeps/linux/metag/Makefile.arch | 4 | ||||
| -rw-r--r-- | libc/sysdeps/linux/metag/bits/atomic.h | 66 | ||||
| -rw-r--r-- | libc/sysdeps/linux/metag/bits/syscalls.h | 73 | ||||
| -rw-r--r-- | libc/sysdeps/linux/metag/clone.S | 50 | ||||
| -rw-r--r-- | libc/sysdeps/linux/metag/crt1.S | 3 | ||||
| -rw-r--r-- | libc/sysdeps/linux/metag/libc-metag_load_tp.S | 7 | ||||
| -rw-r--r-- | libc/sysdeps/linux/metag/sysdep.h | 59 | ||||
| -rw-r--r-- | libc/sysdeps/linux/metag/vfork.S | 67 |
9 files changed, 294 insertions, 36 deletions
diff --git a/libc/sysdeps/linux/common/Makefile.in b/libc/sysdeps/linux/common/Makefile.in index f7083a48b..dbf0b0fd4 100644 --- a/libc/sysdeps/linux/common/Makefile.in +++ b/libc/sysdeps/linux/common/Makefile.in @@ -69,6 +69,7 @@ CSRC- += fork.c getpid.c raise.c #open.c close.c read.c write.c CSRC- += $(if $(findstring =arm=,=$(TARGET_ARCH)=),vfork.c) CSRC- += $(if $(findstring =x86_64=,=$(TARGET_ARCH)=),vfork.c) #CSRC- += $(if $(findstring =mips=y=,=$(TARGET_ARCH)=$(CONFIG_MIPS_O32_ABI)=),waitpid.c) +CSRC- += $(if $(findstring =metag=,=$(TARGET_ARCH)=),vfork.c) endif ifneq ($(ARCH_HAS_DEPRECATED_SYSCALLS),y) # No conversion is needed for new architectures diff --git a/libc/sysdeps/linux/metag/Makefile.arch b/libc/sysdeps/linux/metag/Makefile.arch index 0e6fbfe12..3f11d6da8 100644 --- a/libc/sysdeps/linux/metag/Makefile.arch +++ b/libc/sysdeps/linux/metag/Makefile.arch @@ -7,4 +7,6 @@ CSRC-y := brk.c syscall.c metag.c __syscall_error.c -SSRC-y := _longjmp.S clone.S setjmp.S +SSRC-y := _longjmp.S clone.S setjmp.S vfork.S + +SSRC-$(UCLIBC_HAS_THREADS_NATIVE) += libc-metag_load_tp.S diff --git a/libc/sysdeps/linux/metag/bits/atomic.h b/libc/sysdeps/linux/metag/bits/atomic.h new file mode 100644 index 000000000..64aa50bc4 --- /dev/null +++ b/libc/sysdeps/linux/metag/bits/atomic.h @@ -0,0 +1,66 @@ +/* + * Copyrith (C) 2013 Imagination Technologies Ltd. + * + * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + * + */ + +#include <stdint.h> +#include <sysdep.h> + +typedef int8_t atomic8_t; +typedef uint8_t uatomic8_t; +typedef int_fast8_t atomic_fast8_t; +typedef uint_fast8_t uatomic_fast8_t; + +typedef int32_t atomic32_t; +typedef uint32_t uatomic32_t; +typedef int_fast32_t atomic_fast32_t; +typedef uint_fast32_t uatomic_fast32_t; + +typedef intptr_t atomicptr_t; +typedef uintptr_t uatomicptr_t; +typedef intmax_t atomic_max_t; +typedef uintmax_t uatomic_max_t; + +void __metag_link_error (void); + +#define atomic_full_barrier() \ + __asm__ __volatile__("": : :"memory") + +/* Atomic compare and exchange. This sequence relies on the kernel to + provide a compare and exchange operation which is atomic. */ + +#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \ + ({ __metag_link_error (); oldval; }) + +#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \ + ({ __metag_link_error (); oldval; }) + +/* This code uses the kernel helper to do cmpxchg. It relies on the fact + the helper code only clobbers D0Re0. */ +#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ + ({ register __typeof (oldval) a_current __asm__ ("D1Ar1"); \ + register __typeof (oldval) a_newval __asm__ ("D0Ar2") = (newval); \ + register __typeof (mem) a_ptr __asm__ ("D1Ar3") = (mem); \ + register __typeof (oldval) a_oldval __asm__ ("D0Ar4") = (oldval); \ + __asm__ __volatile__ \ + ("0:\n\t" \ + "GETD %[cur], [%[ptr]]\n\t" \ + "CMP %[cur], %[old]\n\t" \ + "BNE 1f\n\t" \ + "MOVT D1RtP, #0x6fff\n\t" \ + "ADD D1RtP, D1RtP, #0xf040\n\t" \ + "SWAP D1RtP, PC\n\t" \ + "MOV %[cur], %[old]\n\t" \ + "CMP D0Re0, #0\n\t" \ + "BNE 0b\n\t" \ + "1:" \ + : [cur] "=&r" (a_current) \ + : [new] "r" (a_newval), [ptr] "r" (a_ptr), \ + [old] "r" (a_oldval) \ + : "D0Re0", "D1RtP", "cc", "memory"); \ + a_current; }) + +#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ + ({ __metag_link_error (); oldval; }) diff --git a/libc/sysdeps/linux/metag/bits/syscalls.h b/libc/sysdeps/linux/metag/bits/syscalls.h index b5c8fc58c..7ea09c2c3 100644 --- a/libc/sysdeps/linux/metag/bits/syscalls.h +++ b/libc/sysdeps/linux/metag/bits/syscalls.h @@ -49,8 +49,9 @@ (__extension__ \ ({unsigned int __sys_result; \ { \ + PREP_ARGS_##nr (args); \ register int _result __asm__ ("D0Re0"), _nr __asm__ ("D1Re0"); \ - LOAD_ARGS_##nr (args); \ + LOAD_ARGS_##nr; \ _nr = (name); \ __asm__ volatile ("SWITCH #0x440001 ! syscall " #name \ : "=r" (_result) \ @@ -68,32 +69,52 @@ #undef INTERNAL_SYSCALL_ERRNO #define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) -#define LOAD_ARGS_0() +#define PREP_ARGS_0() +#define PREP_ARGS_1(a1) \ + int _t1 = (int) (a1); \ + PREP_ARGS_0 () +#define PREP_ARGS_2(a1, a2) \ + int _t2 = (int) (a2); \ + PREP_ARGS_1 (a1) +#define PREP_ARGS_3(a1, a2, a3) \ + int _t3 = (int) (a3); \ + PREP_ARGS_2 (a1, a2) +#define PREP_ARGS_4(a1, a2, a3, a4) \ + int _t4 = (int) (a4); \ + PREP_ARGS_3 (a1, a2, a3) +#define PREP_ARGS_5(a1, a2, a3, a4, a5) \ + int _t5 = (int) (a5); \ + PREP_ARGS_4 (a1, a2, a3, a4) +#define PREP_ARGS_6(a1, a2, a3, a4, a5, a6) \ + int _t6 = (int) (a6); \ + PREP_ARGS_5 (a1, a2, a3, a4, a5) + +#define LOAD_ARGS_0 #define ASM_ARGS_0 -#define LOAD_ARGS_1(a1) \ - register int _a1 __asm__ ("D1Ar1") = (int) (a1); \ - LOAD_ARGS_0 () -#define ASM_ARGS_1 ASM_ARGS_0, "d" (_a1) -#define LOAD_ARGS_2(a1, a2) \ - register int _a2 __asm__ ("D0Ar2") = (int) (a2); \ - LOAD_ARGS_1 (a1) -#define ASM_ARGS_2 ASM_ARGS_1, "d" (_a2) -#define LOAD_ARGS_3(a1, a2, a3) \ - register int _a3 __asm__ ("D1Ar3") = (int) (a3); \ - LOAD_ARGS_2 (a1, a2) -#define ASM_ARGS_3 ASM_ARGS_2, "d" (_a3) -#define LOAD_ARGS_4(a1, a2, a3, a4) \ - register int _a4 __asm__ ("D0Ar4") = (int) (a4); \ - LOAD_ARGS_3 (a1, a2, a3) -#define ASM_ARGS_4 ASM_ARGS_3, "d" (_a4) -#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \ - register int _a5 __asm__ ("D1Ar5") = (int) (a5); \ - LOAD_ARGS_4 (a1, a2, a3, a4) -#define ASM_ARGS_5 ASM_ARGS_4, "d" (_a5) -#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \ - register int _a6 __asm__ ("D0Ar6") = (int) (a6); \ - LOAD_ARGS_5 (a1, a2, a3, a4, a5) -#define ASM_ARGS_6 ASM_ARGS_5, "d" (_a6) +#define LOAD_ARGS_1 \ + register int _a1 __asm__ ("D1Ar1") = (int) (_t1); \ + LOAD_ARGS_0 +#define ASM_ARGS_1 ASM_ARGS_0, "d" (_a1) +#define LOAD_ARGS_2 \ + register int _a2 __asm__ ("D0Ar2") = (int) (_t2); \ + LOAD_ARGS_1 +#define ASM_ARGS_2 ASM_ARGS_1, "d" (_a2) +#define LOAD_ARGS_3 \ + register int _a3 __asm__ ("D1Ar3") = (int) (_t3); \ + LOAD_ARGS_2 +#define ASM_ARGS_3 ASM_ARGS_2, "d" (_a3) +#define LOAD_ARGS_4 \ + register int _a4 __asm__ ("D0Ar4") = (int) (_t4); \ + LOAD_ARGS_3 +#define ASM_ARGS_4 ASM_ARGS_3, "d" (_a4) +#define LOAD_ARGS_5 \ + register int _a5 __asm__ ("D1Ar5") = (int) (_t5); \ + LOAD_ARGS_4 +#define ASM_ARGS_5 ASM_ARGS_4, "d" (_a5) +#define LOAD_ARGS_6 \ + register int _a6 __asm__ ("D0Ar6") = (int) (_t6); \ + LOAD_ARGS_5 +#define ASM_ARGS_6 ASM_ARGS_5, "d" (_a6) #endif /* __ASSEMBLER__ */ #endif /* _BITS_SYSCALLS_H */ diff --git a/libc/sysdeps/linux/metag/clone.S b/libc/sysdeps/linux/metag/clone.S index 8fff56710..d9d836338 100644 --- a/libc/sysdeps/linux/metag/clone.S +++ b/libc/sysdeps/linux/metag/clone.S @@ -8,7 +8,17 @@ #include <asm/errno.h> #include <asm/unistd.h> -/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ +#define CLONE_VM 0x00000100 +#define CLONE_THREAD 0x00010000 + +#ifdef __PIC__ +#define __CLONE_METAG_LOAD_TP ___metag_load_tp@PLT +#else +#define __CLONE_METAG_LOAD_TP ___metag_load_tp +#endif + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, + pid_t *ptid, struct user_desc *tls, pid_t *ctid); */ .text .global __clone @@ -25,8 +35,12 @@ __clone: MOV D0FrT, D1Ar1 ! do the system call - ! get flags MOV D1Ar1, D1Ar3 + MOV D1Ar3, D1Ar5 + MOV D1Ar5, D0Ar6 + MOV D0Ar6, D0Ar4 + GETD D0Ar4, [A0StP+#-4] + ! new sp is already in D0Ar2 MOV D1Re0, #__NR_clone SWITCH #0x440001 @@ -38,14 +52,36 @@ __clone: ! BRKPNT ! We are the child - ! pick the function arg and call address off the stack and execute - MOV D0Ar2, D0FrT - MOV D1Ar1, D0Ar4 - MOV D1RtP, PC +#ifdef RESET_PID + SETL [A0StP++], D0FrT, D1RtP + MOVT D0FrT, #HI(CLONE_THREAD) + ADD D0FrT, D0FrT, #LO(CLONE_THREAD) + ANDS D0FrT, D0FrT, D1Ar1 + BNZ 3f + MOVT D0FrT, #HI(CLONE_VM) + ADD D0FrT, D0FrT, #LO(CLONE_VM) + ANDS D0FrT, D0FrT, D1Ar1 + BZ 1f + MOV D1Ar1, #-1 + BA 2f +1: MOV D1Re0, #__NR_getpid + SWITCH #0x440001 + MOV D1Ar1, D0Re0 +2: CALLR D1RtP, __CLONE_METAG_LOAD_TP + SUB D0Re0, D0Re0, #TLS_PRE_TCB_SIZE + SETD [D0Re0 + #PID], D1Ar1 + SETD [D0Re0 + #TID], D1Ar1 +3: GETL D0FrT, D1RtP, [--A0StP] +#endif + ! Rearrange the function arg and call address from registers + MOV D0Ar2, D0FrT + MOV D1Ar1, D0Ar6 + MOV D1RtP, PC ADD D1RtP, D1RtP, #8 MOV PC, D0Ar2 - ! and we are done, passing the return value through D0Re0 + ! and we are done, passing the return value D0Re0 through D1Ar1 + MOV D1Ar1, D0Re0 #ifdef __PIC__ B _exit@PLT #else diff --git a/libc/sysdeps/linux/metag/crt1.S b/libc/sysdeps/linux/metag/crt1.S index 74adc1fdb..e8561a46b 100644 --- a/libc/sysdeps/linux/metag/crt1.S +++ b/libc/sysdeps/linux/metag/crt1.S @@ -29,6 +29,7 @@ __start: MOV D1Ar3,D0Ar2 ! argv MOV D0Ar2,D1Ar1 ! argc + MOV D0Ar6,D0Ar4 ! rtld_fini #ifdef __PIC__ ADDT A1LbP,CPC1,#HI(__GLOBAL_OFFSET_TABLE__) @@ -54,8 +55,6 @@ __start: ADD D1Ar5,D1Ar5,#LO(__fini) #endif - MOV D0Ar6,#0 ! rtld_fini - MOVT D1Re0,#0x80 SETL [A0StP++],D0Re0,D1Re0 ! stack_end (8Mb) diff --git a/libc/sysdeps/linux/metag/libc-metag_load_tp.S b/libc/sysdeps/linux/metag/libc-metag_load_tp.S new file mode 100644 index 000000000..a91f162ec --- /dev/null +++ b/libc/sysdeps/linux/metag/libc-metag_load_tp.S @@ -0,0 +1,7 @@ +/* + * Copyright (C) 2013 Imagination Technologies Ltd. + * + * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + */ + +#include <ldso/ldso/metag/metag_load_tp.S> diff --git a/libc/sysdeps/linux/metag/sysdep.h b/libc/sysdeps/linux/metag/sysdep.h new file mode 100644 index 000000000..a12f393ce --- /dev/null +++ b/libc/sysdeps/linux/metag/sysdep.h @@ -0,0 +1,59 @@ +/* + * Assembler macros for Meta. + * + * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + */ + +#include <common/sysdep.h> + +#include <features.h> +#include <libc-internal.h> + +#ifdef __ASSEMBLER__ + +#ifdef SHARED +#define PLTJMP(_x) _x##@PLT +#else +#define PLTJMP(_x) _x +#endif + +#undef PSEUDO_END +#define PSEUDO_END(name) \ + SYSCALL_ERROR_HANDLER \ + END (name) + +#if defined NOT_IN_libc +# define SYSCALL_ERROR __local_syscall_error +# ifdef RTLD_PRIVATE_ERRNO +# define SYSCALL_ERROR_HANDLER \ +__local_syscall_error: \ + NEG D0Re0, D0Re0; \ + ADDT D1Re0, CPC1, #HI(_rtld_errno); \ + ADD D1Re0, D1Re0, #LO(_rtld_errno) + 4; \ + SETD [D1Re0], D0Re0; \ + NEG D0Re0, #0x1; \ + MOV PC, D1RtP; +# else +# define SYSCALL_ERROR_HANDLER \ +__local_syscall_error: \ + MOV D1Re0, D1RtP; \ + SETL [A0StP++], D0Re0, D1Re0; \ + CALLR D1RtP, PLTJMP(___errno_location); \ + GETD D1Re0, [A0StP+#-8]; \ + NEG D1Re0, D1Re0; \ + SETD [D0Re0], D1Re0; \ + NEG D0Re0, #0x1; \ + GETD D1RtP, [A0StP+#-4]; \ + SUB A0StP, A0StP, #0x8; \ + MOV PC, D1RtP; +# endif +#else +# define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */ +# define SYSCALL_ERROR ___syscall_error +#endif + +#endif /* __ASSEMBLER __*/ + +/* Pointer mangling is not yet supported for META. */ +#define PTR_MANGLE(var) (void) (var) +#define PTR_DEMANGLE(var) (void) (var) diff --git a/libc/sysdeps/linux/metag/vfork.S b/libc/sysdeps/linux/metag/vfork.S new file mode 100644 index 000000000..8573dedd3 --- /dev/null +++ b/libc/sysdeps/linux/metag/vfork.S @@ -0,0 +1,67 @@ +! Copyright (C) 2013 Imagination Technologies Ltd. + +! Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + +#include <asm/unistd.h> + +#define _ERRNO_H +#include <bits/errno.h> +#include <sys/syscall.h> + +#ifndef SAVE_PID +#define SAVE_PID +#endif + +#ifndef RESTORE_PID +#define RESTORE_PID +#endif + +#ifdef __NR_vfork +#define __VFORK_NR __NR_vfork +#else +#define __VFORK_NR __NR_fork +#endif + +/* Clone the calling process, but without copying the whole address space. + The calling process is suspended until the new process exits or is + replaced by a call to `execve'. Return -1 for errors, 0 to the new process, + and the process ID of the new process to the old process. */ + + .balign 4 + .global ___vfork + .hidden ___vfork + .type ___vfork, @function +___vfork: + + SAVE_PID + + MOV D1Ar1, #0x4111 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ + MOV D0Ar2, #0 + MOV D1Ar3, #0 + MOV D0Ar4, #0 + MOV D1Ar5, #0 + MOV D0Ar6, #0 + MOV D1Re0, #__NR_clone + SWITCH #0x440001 + + RESTORE_PID + + MOVT D1Re0, #HI(-4096) + ADD D1Re0, D1Re0, #LO(-4096) + CMP D1Re0, D0Re0 + BCS error + + /* Syscall worked. Return to child/parent */ + MOV PC, D1RtP + +error: + MOV D1Ar1, D0Re0 +#ifdef __PIC__ + B ___syscall_error@PLT +#else + B ___syscall_error +#endif + .size ___vfork,.-___vfork + +weak_alias(__vfork,vfork) +libc_hidden_weak(vfork) |