X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Fx86-linux-os.c;h=373ffc53e51f4a937f19accd871e5ef9c29b10b6;hb=7f1e94ae961a198e00daf281eb1dc858e5b2dcc7;hp=7c14c4484f1205c773cdf335b09358838ea7fd3a;hpb=dfa55a883f94470267b626dae77ce7e7dfac3df6;p=sbcl.git diff --git a/src/runtime/x86-linux-os.c b/src/runtime/x86-linux-os.c index 7c14c44..373ffc5 100644 --- a/src/runtime/x86-linux-os.c +++ b/src/runtime/x86-linux-os.c @@ -1,14 +1,28 @@ /* * The x86 Linux incarnation of arch-dependent OS-dependent routines. - * See also linux-os.c + * See also "linux-os.c". */ - -/* header files lifted wholesale from linux-os.c, some may be redundant */ +/* + * This software is part of the SBCL system. See the README file for + * more information. + * + * This software is derived from the CMU CL system, which was + * written at Carnegie Mellon University and released into the + * public domain. The software is in the public domain and is + * provided with absolutely no warranty. See the COPYING and CREDITS + * files for more information. + */ #include +#include #include #include +#include +#include +#include + +#include "sbcl.h" #include "./signal.h" #include "os.h" #include "arch.h" @@ -16,7 +30,6 @@ #include "interrupt.h" #include "interr.h" #include "lispregs.h" -#include "sbcl.h" #include #include @@ -26,44 +39,177 @@ #include #include #include +#include +#include +#include +#include +#include "thread.h" /* dynamic_values_bytes */ + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0) +#define user_desc modify_ldt_ldt_s +#endif + +#define modify_ldt sbcl_modify_ldt +static inline int modify_ldt (int func, void *ptr, unsigned long bytecount) +{ + return syscall (SYS_modify_ldt, func, ptr, bytecount); +} #include "validate.h" size_t os_vm_page_size; -#if defined GENCGC -#include "gencgc.h" +u32 local_ldt_copy[LDT_ENTRIES*LDT_ENTRY_SIZE/sizeof(u32)]; + +/* This is never actually called, but it's great for calling from gdb when + * users have thread-related problems that maintainers can't duplicate */ + +void debug_get_ldt() +{ + int n=modify_ldt (0, local_ldt_copy, sizeof local_ldt_copy); + printf("%d bytes in ldt: print/x local_ldt_copy\n", n); +} + +#ifdef LISP_FEATURE_SB_THREAD +pthread_mutex_t modify_ldt_lock = PTHREAD_MUTEX_INITIALIZER; #endif +int arch_os_thread_init(struct thread *thread) { + stack_t sigstack; +#ifdef LISP_FEATURE_SB_THREAD + struct user_desc ldt_entry = { + 1, 0, 0, /* index, address, length filled in later */ + 1, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 1 + }; + int n; + thread_mutex_lock(&modify_ldt_lock); + n=modify_ldt(0,local_ldt_copy,sizeof local_ldt_copy); + /* get next free ldt entry */ + + if(n) { + u32 *p; + for(n=0,p=local_ldt_copy;*p;p+=LDT_ENTRY_SIZE/sizeof(u32)) + n++; + } + ldt_entry.entry_number=n; + ldt_entry.base_addr=(unsigned long) thread; + ldt_entry.limit=dynamic_values_bytes; + ldt_entry.limit_in_pages=0; + if (modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) { + thread_mutex_unlock(&modify_ldt_lock); + /* modify_ldt call failed: something magical is not happening */ + return 0; + } + __asm__ __volatile__ ("movw %w0, %%fs" : : "q" + ((n << 3) /* selector number */ + + (1 << 2) /* TI set = LDT */ + + 3)); /* privilege level */ + thread->tls_cookie=n; + pthread_mutex_unlock(&modify_ldt_lock); + + /* now %fs:0 refers to the current thread. Useful! Less usefully, + * Linux/x86 isn't capable of reporting a faulting si_addr on a + * segment as defined above (whereas faults on the segment that %gs + * usually points are reported just fine...). As a special + * workaround, we store each thread structure's absolute address as + * as slot in itself, so that within the thread, + * movl %fs:SELFPTR_OFFSET,x + * stores the absolute address of %fs:0 into x. + */ +#ifdef LISP_FEATURE_SB_SAFEPOINT + thread->selfptr = thread; +#endif + + if(n<0) return 0; +#ifdef LISP_FEATURE_GCC_TLS + current_thread = thread; +#else + pthread_setspecific(specials,thread); +#endif +#endif +#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK + /* Signal handlers are run on the control stack, so if it is exhausted + * we had better use an alternate stack for whatever signal tells us + * we've exhausted it */ + sigstack.ss_sp=((void *) thread)+dynamic_values_bytes; + sigstack.ss_flags=0; + sigstack.ss_size = 32*SIGSTKSZ; + if(sigaltstack(&sigstack,0)<0) + lose("Cannot sigaltstack: %s\n",strerror(errno)); +#endif + return 1; +} + +struct thread *debug_get_fs() { + register u32 fs; + __asm__ __volatile__ ("movl %%fs,%0" : "=r" (fs) : ); + return (struct thread *)fs; +} + +/* free any arch/os-specific resources used by thread, which is now + * defunct. Not called on live threads + */ + +int arch_os_thread_cleanup(struct thread *thread) { + struct user_desc ldt_entry = { + 0, 0, 0, + 0, MODIFY_LDT_CONTENTS_DATA, 0, 0, 0, 0 + }; + int result; + + ldt_entry.entry_number=thread->tls_cookie; + thread_mutex_lock(&modify_ldt_lock); + result = modify_ldt(1, &ldt_entry, sizeof (ldt_entry)); + thread_mutex_unlock(&modify_ldt_lock); + return result; +} + + + /* KLUDGE: As of kernel 2.2.14 on Red Hat 6.2, there's code in the * file to define symbolic names for offsets into * gregs[], but it's conditional on __USE_GNU and not defined, so * we need to do this nasty absolute index magic number thing * instead. */ -register_t * +os_context_register_t * os_context_register_addr(os_context_t *context, int offset) { switch(offset) { - case 0: return &context->uc_mcontext.gregs[11]; /* EAX */ - case 2: return &context->uc_mcontext.gregs[10]; /* ECX */ - case 4: return &context->uc_mcontext.gregs[9]; /* EDX */ - case 6: return &context->uc_mcontext.gregs[8]; /* EBX */ - case 8: return &context->uc_mcontext.gregs[7]; /* ESP */ - case 10: return &context->uc_mcontext.gregs[6]; /* EBP */ - case 12: return &context->uc_mcontext.gregs[5]; /* ESI */ - case 14: return &context->uc_mcontext.gregs[4]; /* EDI */ + case reg_EAX: return &context->uc_mcontext.gregs[11]; + case reg_ECX: return &context->uc_mcontext.gregs[10]; + case reg_EDX: return &context->uc_mcontext.gregs[9]; + case reg_EBX: return &context->uc_mcontext.gregs[8]; + case reg_ESP: return &context->uc_mcontext.gregs[7]; + case reg_EBP: return &context->uc_mcontext.gregs[6]; + case reg_ESI: return &context->uc_mcontext.gregs[5]; + case reg_EDI: return &context->uc_mcontext.gregs[4]; default: return 0; } return &context->uc_mcontext.gregs[offset]; } -register_t * + +os_context_register_t * os_context_pc_addr(os_context_t *context) { - return &context->uc_mcontext.gregs[14]; + return &context->uc_mcontext.gregs[14]; /* REG_EIP */ } -register_t * + +os_context_register_t * os_context_sp_addr(os_context_t *context) { - return &context->uc_mcontext.gregs[17]; + return &context->uc_mcontext.gregs[17]; /* REG_UESP */ +} + +os_context_register_t * +os_context_fp_addr(os_context_t *context) +{ + return &context->uc_mcontext.gregs[6]; /* REG_EBP */ +} + +unsigned long +os_context_fp_control(os_context_t *context) +{ + return ((((context->uc_mcontext.fpregs->cw) & 0xffff) ^ 0x3f) | + (((context->uc_mcontext.fpregs->sw) & 0xffff) << 16)); } sigset_t * @@ -73,7 +219,13 @@ os_context_sigmask_addr(os_context_t *context) } void -os_flush_icache(os_vm_address_t address, os_vm_size_t length) +os_restore_fp_control(os_context_t *context) { + if (context->uc_mcontext.fpregs) + asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cw)); } +void +os_flush_icache(os_vm_address_t address, os_vm_size_t length) +{ +}