src/runtime/x86-64-linux-os.c

   1 /*
   2  * The x86-64 Linux incarnation of arch-dependent OS-dependent
   3  * routines.  See also "linux-os.c".
   4  */
   5
   6 /*
   7  * This software is part of the SBCL system. See the README file for
   8  * more information.
   9  *
  10  * This software is derived from the CMU CL system, which was
  11  * written at Carnegie Mellon University and released into the
  12  * public domain. The software is in the public domain and is
  13  * provided with absolutely no warranty. See the COPYING and CREDITS
  14  * files for more information.
  15  */
  16
  17 #include <stdio.h>
  18 #include <stddef.h>
  19 #include <sys/param.h>
  20 #include <sys/file.h>
  21 #include <sys/types.h>
  22 #include <unistd.h>
  23 #include <errno.h>
  24
  25 #define __USE_GNU
  26 #include <sys/ucontext.h>
  27 #undef __USE_GNU
  28
  29
  30 #include "./signal.h"
  31 #include "os.h"
  32 #include "arch.h"
  33 #include "globals.h"
  34 #include "interrupt.h"
  35 #include "interr.h"
  36 #include "lispregs.h"
  37 #include "sbcl.h"
  38 #include <sys/socket.h>
  39 #include <sys/utsname.h>
  40
  41 #include <sys/types.h>
  42 #include <signal.h>
  43 /* #include <sys/sysinfo.h> */
  44 #include <sys/time.h>
  45 #include <sys/stat.h>
  46 #include <unistd.h>
  47 #include <asm/ldt.h>
  48 #include <linux/unistd.h>
  49 #include <sys/mman.h>
  50 #include <linux/version.h>
  51 #include "thread.h"             /* dynamic_values_bytes */
  52
  53 #include "validate.h"
  54 size_t os_vm_page_size;
  55
  56 int arch_os_thread_init(struct thread *thread) {
  57     stack_t sigstack;
  58 #ifdef LISP_FEATURE_SB_THREAD
  59 #ifdef LISP_FEATURE_GCC_TLS
  60     current_thread = thread;
  61 #else
  62     pthread_setspecific(specials,thread);
  63 #endif
  64 #endif
  65 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
  66     /* Signal handlers are run on the control stack, so if it is exhausted
  67      * we had better use an alternate stack for whatever signal tells us
  68      * we've exhausted it */
  69     sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
  70     sigstack.ss_flags=0;
  71     sigstack.ss_size = 32*SIGSTKSZ;
  72     if(sigaltstack(&sigstack,0)<0) {
  73         lose("Cannot sigaltstack: %s\n",strerror(errno));
  74     }
  75 #endif
  76     return 1;
  77 }
  78
  79 /* free any arch/os-specific resources used by thread, which is now
  80  * defunct.  Not called on live threads
  81  */
  82
  83 int arch_os_thread_cleanup(struct thread *thread) {
  84     return 1;
  85 }
  86
  87
  88 os_context_register_t *
  89 os_context_register_addr(os_context_t *context, int offset)
  90 {
  91 #define RCASE(name) case reg_ ## name: return &context->uc_mcontext.gregs[REG_ ## name];
  92     switch(offset) {
  93         RCASE(RAX)
  94         RCASE(RCX)
  95         RCASE(RDX)
  96         RCASE(RBX)
  97         RCASE(RSP)
  98         RCASE(RBP)
  99         RCASE(RSI)
 100         RCASE(RDI)
 101         RCASE(R8)
 102         RCASE(R9)
 103         RCASE(R10)
 104         RCASE(R11)
 105         RCASE(R12)
 106         RCASE(R13)
 107         RCASE(R14)
 108         RCASE(R15)
 109       default:
 110         if(offset<NGREG)
 111             return &context->uc_mcontext.gregs[offset/2+4];
 112         else return 0;
 113     }
 114     return &context->uc_mcontext.gregs[offset];
 115 }
 116
 117 os_context_register_t *
 118 os_context_pc_addr(os_context_t *context)
 119 {
 120     return &context->uc_mcontext.gregs[REG_RIP]; /*  REG_EIP */
 121 }
 122
 123 os_context_register_t *
 124 os_context_sp_addr(os_context_t *context)
 125 {
 126     return &context->uc_mcontext.gregs[REG_RSP];
 127 }
 128
 129 os_context_register_t *
 130 os_context_fp_addr(os_context_t *context)
 131 {
 132     return &context->uc_mcontext.gregs[REG_RBP];
 133 }
 134
 135 unsigned long
 136 os_context_fp_control(os_context_t *context)
 137 {
 138     /* return the x87 exception flags ored in with the sse2
 139      * control+status flags */
 140     unsigned int result = (context->uc_mcontext.fpregs->swd & 0x3F) | context->uc_mcontext.fpregs->mxcsr;
 141     /* flip exception mask bits */
 142     return result ^ (0x3F << 7);
 143 }
 144
 145 sigset_t *
 146 os_context_sigmask_addr(os_context_t *context)
 147 {
 148     return &context->uc_sigmask;
 149 }
 150
 151 void
 152 os_restore_fp_control(os_context_t *context)
 153 {
 154     if (context->uc_mcontext.fpregs) {
 155         /* reset exception flags and restore control flags on SSE2 FPU */
 156         unsigned int temp = (context->uc_mcontext.fpregs->mxcsr) & ~0x3F;
 157         asm ("ldmxcsr %0" : : "m" (temp));
 158         /* same for x87 FPU. */
 159         asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cwd));
 160     }
 161 }
 162
 163 void
 164 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
 165 {
 166 }
 167