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 #define _GNU_SOURCE /* for REG_RAX etc. from sys/ucontext */
  18
  19 #include <stdio.h>
  20 #include <stddef.h>
  21 #include <sys/param.h>
  22 #include <sys/file.h>
  23 #include <sys/types.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26
  27 #include <sys/ucontext.h>
  28
  29 #include "./signal.h"
  30 #include "os.h"
  31 #include "arch.h"
  32 #include "globals.h"
  33 #include "interrupt.h"
  34 #include "interr.h"
  35 #include "lispregs.h"
  36 #include "sbcl.h"
  37 #include <sys/socket.h>
  38 #include <sys/utsname.h>
  39
  40 #include <sys/types.h>
  41 #include <signal.h>
  42 /* #include <sys/sysinfo.h> */
  43 #include <sys/time.h>
  44 #include <sys/stat.h>
  45 #include <unistd.h>
  46 #include <linux/unistd.h>
  47 #include <sys/mman.h>
  48 #include <linux/version.h>
  49 #include "thread.h"             /* dynamic_values_bytes */
  50
  51 #include "validate.h"
  52 size_t os_vm_page_size;
  53
  54 int arch_os_thread_init(struct thread *thread) {
  55     stack_t sigstack;
  56 #ifdef LISP_FEATURE_SB_THREAD
  57 #ifdef LISP_FEATURE_GCC_TLS
  58     current_thread = thread;
  59 #else
  60     pthread_setspecific(specials,thread);
  61 #endif
  62 #endif
  63 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
  64     /* Signal handlers are run on the control stack, so if it is exhausted
  65      * we had better use an alternate stack for whatever signal tells us
  66      * we've exhausted it */
  67     sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
  68     sigstack.ss_flags=0;
  69     sigstack.ss_size = 32*SIGSTKSZ;
  70     if(sigaltstack(&sigstack,0)<0) {
  71         lose("Cannot sigaltstack: %s\n",strerror(errno));
  72     }
  73 #endif
  74     return 1;
  75 }
  76
  77 /* free any arch/os-specific resources used by thread, which is now
  78  * defunct.  Not called on live threads
  79  */
  80
  81 int arch_os_thread_cleanup(struct thread *thread) {
  82     return 1;
  83 }
  84
  85
  86 os_context_register_t *
  87 os_context_register_addr(os_context_t *context, int offset)
  88 {
  89 #define RCASE(name) case reg_ ## name: return \
  90  (os_context_register_t*)&context->uc_mcontext.gregs[REG_ ## name];
  91     switch(offset) {
  92         RCASE(RAX)
  93         RCASE(RCX)
  94         RCASE(RDX)
  95         RCASE(RBX)
  96         RCASE(RSP)
  97         RCASE(RBP)
  98         RCASE(RSI)
  99         RCASE(RDI)
 100         RCASE(R8)
 101         RCASE(R9)
 102         RCASE(R10)
 103         RCASE(R11)
 104         RCASE(R12)
 105         RCASE(R13)
 106         RCASE(R14)
 107         RCASE(R15)
 108       default:
 109         if(offset<NGREG)
 110             return (os_context_register_t*)&context->uc_mcontext.gregs[offset/2+4];
 111         else return 0;
 112     }
 113     return (os_context_register_t*)&context->uc_mcontext.gregs[offset];
 114 }
 115
 116 os_context_register_t *
 117 os_context_pc_addr(os_context_t *context)
 118 {
 119     return (os_context_register_t*)&context->uc_mcontext.gregs[REG_RIP]; /*  REG_EIP */
 120 }
 121
 122 os_context_register_t *
 123 os_context_sp_addr(os_context_t *context)
 124 {
 125     return (os_context_register_t*)&context->uc_mcontext.gregs[REG_RSP];
 126 }
 127
 128 os_context_register_t *
 129 os_context_fp_addr(os_context_t *context)
 130 {
 131     return (os_context_register_t*)&context->uc_mcontext.gregs[REG_RBP];
 132 }
 133
 134 unsigned long
 135 os_context_fp_control(os_context_t *context)
 136 {
 137     /* return the x87 exception flags ored in with the sse2
 138      * control+status flags */
 139     unsigned int result = (context->uc_mcontext.fpregs->swd & 0x3F) | context->uc_mcontext.fpregs->mxcsr;
 140     /* flip exception mask bits */
 141     return result ^ (0x3F << 7);
 142 }
 143
 144 sigset_t *
 145 os_context_sigmask_addr(os_context_t *context)
 146 {
 147     return &context->uc_sigmask;
 148 }
 149
 150 void
 151 os_restore_fp_control(os_context_t *context)
 152 {
 153     if (context->uc_mcontext.fpregs) {
 154         /* reset exception flags and restore control flags on SSE2 FPU */
 155         unsigned int temp = (context->uc_mcontext.fpregs->mxcsr) & ~0x3F;
 156         asm ("ldmxcsr %0" : : "m" (temp));
 157         /* same for x87 FPU. */
 158         asm ("fldcw %0" : : "m" (context->uc_mcontext.fpregs->cwd));
 159     }
 160 }
 161
 162 void
 163 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
 164 {
 165 }
 166