src/runtime/arm-bsd-os.c

   1 /*
   2  * This is the ARM BSD incarnation of arch-dependent OS-dependent
   3  * routines. See also "bsd-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 "sbcl.h"
  21 #include "./signal.h"
  22 #include "os.h"
  23 #include "arch.h"
  24 #include "globals.h"
  25 #include "interrupt.h"
  26 #include "interr.h"
  27 #include "lispregs.h"
  28 #include <sys/socket.h>
  29 #include <sys/utsname.h>
  30 #include <machine/sysarch.h>
  31
  32 #include <sys/types.h>
  33 #include <signal.h>
  34 #include <sys/time.h>
  35 #include <sys/stat.h>
  36 #include <unistd.h>
  37 #include <errno.h>
  38
  39 #include "validate.h"
  40 size_t os_vm_page_size;
  41
  42 #ifdef LISP_FEATURE_SB_THREAD
  43 #error "Define threading support functions"
  44 #else
  45 int arch_os_thread_init(struct thread *thread) {
  46     stack_t sigstack;
  47     /* Signal handlers are normally run on the main stack, but we've
  48      * swapped stacks, require that the control stack contain only
  49      * boxed data, and expands upwards while the C stack expands
  50      * downwards. */
  51     sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
  52     sigstack.ss_flags=0;
  53     sigstack.ss_size = 32*SIGSTKSZ;
  54     if(sigaltstack(&sigstack,0)<0)
  55         lose("Cannot sigaltstack: %s\n",strerror(errno));
  56
  57     return 1;                   /* success */
  58 }
  59 int arch_os_thread_cleanup(struct thread *thread) {
  60     return 1;                   /* success */
  61 }
  62 #endif
  63
  64 os_context_register_t   *
  65 os_context_register_addr(os_context_t *context, int offset)
  66 {
  67     /* KLUDGE: All of the context registers are stored in the
  68      * structure consecutively, in order, as separately-named fields.
  69      * Rather than do a big switch/case and all that, just take the
  70      * address of the first one (R0) and treat it as the start of an
  71      * array. */
  72     return &context->uc_mcontext.__gregs[offset];
  73 }
  74
  75 os_context_register_t *
  76 os_context_pc_addr(os_context_t *context)
  77 {
  78     return os_context_register_addr(context, reg_PC);
  79 }
  80
  81 os_context_register_t *
  82 os_context_lr_addr(os_context_t *context)
  83 {
  84     return os_context_register_addr(context, reg_LR);
  85 }
  86
  87 void
  88 os_restore_fp_control(os_context_t *context)
  89 {
  90     /* FIXME: Implement. */
  91 }
  92
  93 void
  94 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
  95 {
  96     arm_sync_icache(address, length);
  97 }
  98
  99 static void
 100 sigtrap_handler(int signal, siginfo_t *siginfo, os_context_t *context)
 101 {
 102     unsigned int code = *((unsigned char *)(4+*os_context_pc_addr(context)));
 103     u32 trap_instruction = *((u32 *)*os_context_pc_addr(context));
 104
 105     if (trap_instruction != 0xe7ffdefe) {
 106         lose("Unrecognized trap instruction %08lx in sigtrap_handler()",
 107              trap_instruction);
 108     }
 109
 110     if (code == trap_PendingInterrupt) {
 111       arch_skip_instruction(context);
 112     }
 113
 114     handle_trap(context, code);
 115 }
 116
 117 void arch_install_interrupt_handlers()
 118 {
 119     undoably_install_low_level_interrupt_handler(SIGTRAP, sigtrap_handler);
 120 }