src/runtime/x86-bsd-os.c

   1 #include <signal.h>
   2 #include "sbcl.h"
   3 #include "runtime.h"
   4 #include "thread.h"
   5
   6
   7 #ifdef LISP_FEATURE_SB_THREAD
   8 #ifdef LISP_FEATURE_DARWIN
   9 #include <architecture/i386/table.h>
  10 #include <i386/user_ldt.h>
  11 #include <mach/mach_init.h>
  12 #else
  13 #include <machine/segments.h>
  14 #include <machine/sysarch.h>
  15 #endif /* LISP_FEATURE_DARWIN */
  16 #endif
  17
  18 #if defined(LISP_FEATURE_FREEBSD)
  19 #include "machine/npx.h"
  20 #endif
  21
  22 /* KLUDGE: There is strong family resemblance in the signal context
  23  * stuff in FreeBSD and OpenBSD, but in detail they're different in
  24  * almost every line of code. It would be nice to find some way to
  25  * factor out the commonality better; failing that, it might be best
  26  * just to split this generic-BSD code into one variant for each BSD.
  27  *
  28  * KLUDGE II: this split has begun with the addition of the Darwin BSD
  29  * flavour, with the cross-architecture complications that this
  30  * entails; unfortunately, currently the situation is worse, not
  31  * better, than in the above paragraph. */
  32
  33 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(LISP_FEATURE_DARWIN)
  34 int *
  35 os_context_register_addr(os_context_t *context, int offset)
  36 {
  37     switch(offset) {
  38     case  0:
  39         return (int *)CONTEXT_ADDR_FROM_STEM(eax);
  40     case  2:
  41         return (int *)CONTEXT_ADDR_FROM_STEM(ecx);
  42     case  4:
  43         return (int *)CONTEXT_ADDR_FROM_STEM(edx);
  44     case  6:
  45         return (int *)CONTEXT_ADDR_FROM_STEM(ebx);
  46     case  8:
  47         return (int *)CONTEXT_ADDR_FROM_STEM(esp);
  48     case 10:
  49         return (int *)CONTEXT_ADDR_FROM_STEM(ebp);
  50     case 12:
  51         return (int *)CONTEXT_ADDR_FROM_STEM(esi);
  52     case 14:
  53         return (int *)CONTEXT_ADDR_FROM_STEM(edi);
  54     default:
  55         return 0;
  56     }
  57 }
  58
  59 int *
  60 os_context_sp_addr(os_context_t *context)
  61 {
  62     return (int *)CONTEXT_ADDR_FROM_STEM(esp);
  63 }
  64
  65 #endif /* __FreeBSD__ || __OpenBSD__ */
  66
  67 #ifdef __NetBSD__
  68 int *
  69 os_context_register_addr(os_context_t *context, int offset)
  70 {
  71     switch(offset) {
  72     case  0:
  73         return CONTEXT_ADDR_FROM_STEM(EAX);
  74     case  2:
  75         return CONTEXT_ADDR_FROM_STEM(ECX);
  76     case  4:
  77         return CONTEXT_ADDR_FROM_STEM(EDX);
  78     case  6:
  79         return CONTEXT_ADDR_FROM_STEM(EBX);
  80     case  8:
  81         return CONTEXT_ADDR_FROM_STEM(ESP);
  82     case 10:
  83         return CONTEXT_ADDR_FROM_STEM(EBP);
  84     case 12:
  85         return CONTEXT_ADDR_FROM_STEM(ESI);
  86     case 14:
  87         return CONTEXT_ADDR_FROM_STEM(EDI);
  88     case 16:
  89         return CONTEXT_ADDR_FROM_STEM(UESP);
  90     default:
  91         return 0;
  92     }
  93 }
  94
  95 int *
  96 os_context_sp_addr(os_context_t *context)
  97 {
  98     return &(_UC_MACHINE_SP(context));
  99 }
 100
 101 #endif  /* __NetBSD__ */
 102
 103 int *os_context_pc_addr(os_context_t *context)
 104 {
 105 #if defined __FreeBSD__
 106     return CONTEXT_ADDR_FROM_STEM(eip);
 107 #elif defined __OpenBSD__
 108     return CONTEXT_ADDR_FROM_STEM(pc);
 109 #elif defined __NetBSD__
 110     return CONTEXT_ADDR_FROM_STEM(EIP);
 111 #elif defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_X86)
 112     return (int *)CONTEXT_ADDR_FROM_STEM(eip);
 113 #elif defined LISP_FEATURE_DARWIN
 114     return &context->uc_mcontext->ss.srr0;
 115 #else
 116 #error unsupported BSD variant
 117 #endif
 118 }
 119
 120 /* FIXME: If this can be a no-op on BSD/x86, then it
 121  * deserves a more precise name.
 122  *
 123  * (Perhaps os_prepare_data_area_to_be_executed()?) */
 124 void
 125 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
 126 {
 127 }
 128
 129 /* Note: the Darwin versions of arch_os_thread_init found in
 130  * x86-darwin-os.c
 131 */
 132 #if !defined(LISP_FEATURE_DARWIN)
 133
 134 #ifdef LISP_FEATURE_SB_THREAD
 135
 136 void set_data_desc_size(struct segment_descriptor* desc, unsigned long size)
 137 {
 138     desc->sd_lolimit = (size - 1) & 0xffff;
 139     desc->sd_hilimit = ((size - 1) >> 16) &0xf;
 140 }
 141
 142 void set_data_desc_addr(struct segment_descriptor* desc, void* addr)
 143 {
 144     desc->sd_lobase = (unsigned int)addr & 0xffffff;
 145     desc->sd_hibase = ((unsigned int)addr & 0xff000000) >> 24;
 146 }
 147
 148 #endif
 149
 150 int arch_os_thread_init(struct thread *thread) {
 151
 152 #ifdef LISP_FEATURE_SB_THREAD
 153     int n;
 154     int sel;
 155
 156     struct segment_descriptor ldt_entry = { 0, 0, SDT_MEMRW, SEL_UPL, 1,
 157                                             0, 0, 1, 0, 0 };
 158
 159     set_data_desc_addr(&ldt_entry, thread);
 160     set_data_desc_size(&ldt_entry, dynamic_values_bytes);
 161
 162     n = i386_set_ldt(LDT_AUTO_ALLOC, (union descriptor*) &ldt_entry, 1);
 163     if (n < 0) {
 164         perror("i386_set_ldt");
 165         lose("unexpected i386_set_ldt(..) failure\n");
 166     }
 167     FSHOW_SIGNAL((stderr, "/ TLS: Allocated LDT %x\n", n));
 168     sel =  LSEL(n, SEL_UPL);
 169     load_fs(sel);
 170
 171     thread->tls_cookie=n;
 172 #ifdef LISP_FEATURE_GCC_TLS
 173     current_thread = thread;
 174 #else
 175     pthread_setspecific(specials,thread);
 176 #endif
 177 #endif
 178
 179 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 180     stack_t sigstack;
 181
 182     /* Signal handlers are run on the control stack, so if it is exhausted
 183      * we had better use an alternate stack for whatever signal tells us
 184      * we've exhausted it */
 185     sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
 186     sigstack.ss_flags=0;
 187     sigstack.ss_size = 32*SIGSTKSZ;
 188     sigaltstack(&sigstack,0);
 189 #endif
 190
 191     return 1;                  /* success */
 192 }
 193
 194 int arch_os_thread_cleanup(struct thread *thread) {
 195
 196 #if defined(LISP_FEATURE_SB_THREAD)
 197     int n = thread->tls_cookie;
 198
 199     /* Set the %%fs register back to 0 and free the ldt by setting it
 200      * to NULL.
 201      */
 202     FSHOW_SIGNAL((stderr, "/ TLS: Freeing LDT %x\n", n));
 203
 204     __asm__ __volatile__ ("mov %0, %%fs" : : "r"(0));
 205     i386_set_ldt(n, NULL, 1);
 206 #endif
 207
 208     return 1;                  /* success */
 209 }
 210
 211 #endif /* !LISP_FEATURE_DARWIN */
 212
 213 #if defined(LISP_FEATURE_FREEBSD)
 214 #if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
 215 void
 216 os_restore_tls_segment_register(os_context_t *context)
 217 {
 218     load_fs(context->uc_mcontext.mc_fs);
 219 }
 220 #endif
 221
 222 void
 223 os_restore_fp_control(os_context_t *context)
 224 {
 225     /* FPU state is saved per context on post-KSE systems.
 226      * On earlier systems, it is shared in a whole process.
 227      */
 228 #if defined(__FreeBSD_version) && __FreeBSD_version >= 500040
 229     struct envxmm *ex = (struct envxmm *)(context->uc_mcontext.mc_fpstate);
 230     __asm__ __volatile__ ("fldcw %0" : : "m" (ex->en_cw));
 231 #endif
 232 #if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
 233     /* Calling this function here may not be good idea.  Or rename
 234      * function name os_restore_fp_control to os_restore_context or
 235      * so, to match the behavior?  */
 236     os_restore_tls_segment_register(context);
 237 #endif
 238 }
 239 #endif