src/runtime/sparc-linux-os.c

   1 /*
   2  * This is the SPARC 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 <sys/param.h>
  19 #include <sys/file.h>
  20 #include "genesis/sbcl.h"
  21 #include "os.h"
  22 #include "arch.h"
  23 #include "globals.h"
  24 #include "interrupt.h"
  25 #include "interr.h"
  26 #include "lispregs.h"
  27
  28 #include <sys/types.h>
  29 #include <signal.h>
  30 #include <sys/time.h>
  31 #include <sys/stat.h>
  32 #include <unistd.h>
  33
  34 #include "validate.h"
  35
  36 #ifdef LISP_FEATURE_SB_THREAD
  37 #error "Define threading support functions"
  38 #else
  39 int arch_os_thread_init(struct thread *thread) {
  40     return 1;                   /* success */
  41 }
  42 int arch_os_thread_cleanup(struct thread *thread) {
  43     return 1;                   /* success */
  44 }
  45 #endif
  46
  47 os_context_register_t   *
  48 os_context_register_addr(os_context_t *context, int offset)
  49 {
  50     if (offset == 0) {
  51         static int zero;
  52         zero = 0;
  53         return (os_context_register_t*)&zero;
  54     } else if (offset < 16) {
  55         return &context->si_regs.u_regs[offset];
  56     } else if (offset < 32) {
  57         unsigned int *sp = (unsigned int*) context->si_regs.u_regs[14]; /* Stack Pointer */
  58         return &(sp[offset-16]);
  59     } else
  60         return 0;
  61 }
  62
  63 os_context_register_t *
  64 os_context_npc_addr(os_context_t *context)
  65 {
  66     return &(context->si_regs.npc);
  67 }
  68
  69 sigset_t *
  70 os_context_sigmask_addr(os_context_t *context)
  71 {
  72     return (sigset_t*)&(context->si_mask);
  73 }
  74
  75 void
  76 os_restore_fp_control(os_context_t *context)
  77 {
  78     /* Included here, for reference, is an attempt at the PPC
  79        variant. If it weren't the case that SPARC/Linux gave a Bus
  80        Error on floating point exceptions, something like this would
  81        have to be done. -- CSR, 2002-07-13
  82
  83     asm ("msfsf $255, %0" : : "m"
  84          (os_context_fp_control(context) &
  85           ~ (FLOAT_STICKY_BITS_MASK | FLOAT_EXCEPTIONS_BYTE_MASK)));
  86     */
  87 }
  88
  89 void
  90 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
  91 {
  92     /* This is the same for linux and solaris, so see sparc-assem.S */
  93     extern void sparc_flush_icache(os_vm_address_t,os_vm_size_t);
  94     sparc_flush_icache(address,length);
  95 }