src/runtime/arm-linux-os.c

   1 /*
   2  * This is the ARM 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 "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
  31 #include <sys/types.h>
  32 #include <signal.h>
  33 #include <sys/time.h>
  34 #include <sys/stat.h>
  35 #include <unistd.h>
  36 #include <errno.h>
  37
  38 #include "validate.h"
  39 size_t os_vm_page_size;
  40
  41 #ifdef LISP_FEATURE_SB_THREAD
  42 #error "Define threading support functions"
  43 #else
  44 int arch_os_thread_init(struct thread *thread) {
  45     stack_t sigstack;
  46     /* Signal handlers are normally run on the main stack, but we've
  47      * swapped stacks, require that the control stack contain only
  48      * boxed data, and expands upwards while the C stack expands
  49      * downwards. */
  50     sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
  51     sigstack.ss_flags=0;
  52     sigstack.ss_size = 32*SIGSTKSZ;
  53     if(sigaltstack(&sigstack,0)<0)
  54         lose("Cannot sigaltstack: %s\n",strerror(errno));
  55
  56     return 1;                   /* success */
  57 }
  58 int arch_os_thread_cleanup(struct thread *thread) {
  59     return 1;                   /* success */
  60 }
  61 #endif
  62
  63 os_context_register_t   *
  64 os_context_register_addr(os_context_t *context, int offset)
  65 {
  66     /* KLUDGE: All of the context registers are stored in the
  67      * structure consecutively, in order, as separately-named fields.
  68      * Rather than do a big switch/case and all that, just take the
  69      * address of the first one (R0) and treat it as the start of an
  70      * array. */
  71     return &(&context->uc_mcontext.arm_r0)[offset];
  72 }
  73
  74 os_context_register_t *
  75 os_context_pc_addr(os_context_t *context)
  76 {
  77     return os_context_register_addr(context, reg_PC);
  78 }
  79
  80 os_context_register_t *
  81 os_context_lr_addr(os_context_t *context)
  82 {
  83     return os_context_register_addr(context, reg_LR);
  84 }
  85
  86 sigset_t *
  87 os_context_sigmask_addr(os_context_t *context)
  88 {
  89     return &(context->uc_sigmask);
  90 }
  91
  92 void
  93 os_restore_fp_control(os_context_t *context)
  94 {
  95     /* FIXME: Implement. */
  96 }
  97
  98 void
  99 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
 100 {
 101     os_vm_address_t end_address
 102         = (os_vm_address_t)(((pointer_sized_uint_t) address) + length);
 103     __clear_cache(address, end_address);
 104 }
 105
 106 static void
 107 sigtrap_handler(int signal, siginfo_t *siginfo, os_context_t *context)
 108 {
 109     unsigned int code = *((unsigned char *)(4+*os_context_pc_addr(context)));
 110     u32 trap_instruction = *((u32 *)*os_context_pc_addr(context));
 111
 112     if (trap_instruction != 0xe7f001f0) {
 113         lose("Unrecognized trap instruction %08lx in sigtrap_handler()",
 114              trap_instruction);
 115     }
 116
 117     if (code == trap_PendingInterrupt) {
 118       arch_skip_instruction(context);
 119     }
 120
 121     handle_trap(context, code);
 122 }
 123
 124 void arch_install_interrupt_handlers()
 125 {
 126     undoably_install_low_level_interrupt_handler(SIGTRAP, sigtrap_handler);
 127 }