8 #ifdef LISP_FEATURE_SB_THREAD
9 #ifdef LISP_FEATURE_DARWIN
10 #include <architecture/i386/table.h>
11 #include <i386/user_ldt.h>
12 #include <mach/mach_init.h>
14 #include <machine/segments.h>
15 #include <machine/sysarch.h>
16 #endif /* LISP_FEATURE_DARWIN */
19 #if defined(LISP_FEATURE_FREEBSD)
20 #include "machine/npx.h"
23 #if defined(LISP_FEATURE_OPENBSD)
24 #include <machine/npx.h>
26 #include "openbsd-sigcontext.h"
27 #ifdef OS_OPENBSD_FPSTATE_IN_SIGFRAME
28 # include <machine/frame.h>
32 /* KLUDGE: There is strong family resemblance in the signal context
33 * stuff in FreeBSD and OpenBSD, but in detail they're different in
34 * almost every line of code. It would be nice to find some way to
35 * factor out the commonality better; failing that, it might be best
36 * just to split this generic-BSD code into one variant for each BSD.
38 * KLUDGE II: this split has begun with the addition of the Darwin BSD
39 * flavour, with the cross-architecture complications that this
40 * entails; unfortunately, currently the situation is worse, not
41 * better, than in the above paragraph. */
43 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(LISP_FEATURE_DARWIN)
45 os_context_register_addr(os_context_t *context, int offset)
49 return (int *)CONTEXT_ADDR_FROM_STEM(eax);
51 return (int *)CONTEXT_ADDR_FROM_STEM(ecx);
53 return (int *)CONTEXT_ADDR_FROM_STEM(edx);
55 return (int *)CONTEXT_ADDR_FROM_STEM(ebx);
57 return (int *)CONTEXT_ADDR_FROM_STEM(esp);
59 return (int *)CONTEXT_ADDR_FROM_STEM(ebp);
61 return (int *)CONTEXT_ADDR_FROM_STEM(esi);
63 return (int *)CONTEXT_ADDR_FROM_STEM(edi);
70 os_context_sp_addr(os_context_t *context)
72 return (int *)CONTEXT_ADDR_FROM_STEM(esp);
75 #endif /* __FreeBSD__ || __OpenBSD__ */
79 os_context_register_addr(os_context_t *context, int offset)
83 return CONTEXT_ADDR_FROM_STEM(EAX);
85 return CONTEXT_ADDR_FROM_STEM(ECX);
87 return CONTEXT_ADDR_FROM_STEM(EDX);
89 return CONTEXT_ADDR_FROM_STEM(EBX);
91 return CONTEXT_ADDR_FROM_STEM(ESP);
93 return CONTEXT_ADDR_FROM_STEM(EBP);
95 return CONTEXT_ADDR_FROM_STEM(ESI);
97 return CONTEXT_ADDR_FROM_STEM(EDI);
99 return CONTEXT_ADDR_FROM_STEM(UESP);
106 os_context_sp_addr(os_context_t *context)
108 return &(_UC_MACHINE_SP(context));
111 #endif /* __NetBSD__ */
113 int *os_context_pc_addr(os_context_t *context)
115 #if defined __FreeBSD__
116 return CONTEXT_ADDR_FROM_STEM(eip);
117 #elif defined __OpenBSD__
118 return CONTEXT_ADDR_FROM_STEM(pc);
119 #elif defined __NetBSD__
120 return CONTEXT_ADDR_FROM_STEM(EIP);
121 #elif defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_X86)
122 return (int *)CONTEXT_ADDR_FROM_STEM(eip);
123 #elif defined LISP_FEATURE_DARWIN
124 return &context->uc_mcontext->ss.srr0;
126 #error unsupported BSD variant
130 /* FIXME: If this can be a no-op on BSD/x86, then it
131 * deserves a more precise name.
133 * (Perhaps os_prepare_data_area_to_be_executed()?) */
135 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
139 /* Note: the Darwin versions of arch_os_thread_init found in
142 #if !defined(LISP_FEATURE_DARWIN)
144 #ifdef LISP_FEATURE_SB_THREAD
146 void set_data_desc_size(struct segment_descriptor* desc, unsigned long size)
148 desc->sd_lolimit = (size - 1) & 0xffff;
149 desc->sd_hilimit = ((size - 1) >> 16) &0xf;
152 void set_data_desc_addr(struct segment_descriptor* desc, void* addr)
154 desc->sd_lobase = (unsigned int)addr & 0xffffff;
155 desc->sd_hibase = ((unsigned int)addr & 0xff000000) >> 24;
160 #ifdef LISP_FEATURE_SB_THREAD
162 arch_os_load_ldt(struct thread *thread)
164 int sel = LSEL(thread->tls_cookie, SEL_UPL);
165 unsigned int fs = rfs();
167 /* Load FS only if it's necessary. Modifying a selector
168 * causes privilege checking and it takes long time. */
174 int arch_os_thread_init(struct thread *thread) {
176 #ifdef LISP_FEATURE_SB_THREAD
179 struct segment_descriptor ldt_entry = { 0, 0, SDT_MEMRW, SEL_UPL, 1,
182 set_data_desc_addr(&ldt_entry, thread);
183 set_data_desc_size(&ldt_entry, dynamic_values_bytes);
185 n = i386_set_ldt(LDT_AUTO_ALLOC, (union descriptor*) &ldt_entry, 1);
187 perror("i386_set_ldt");
188 lose("unexpected i386_set_ldt(..) failure\n");
190 FSHOW_SIGNAL((stderr, "/ TLS: Allocated LDT %x\n", n));
191 thread->tls_cookie=n;
192 arch_os_load_ldt(thread);
194 #ifdef LISP_FEATURE_GCC_TLS
195 current_thread = thread;
197 pthread_setspecific(specials,thread);
201 #ifdef LISP_FEATURE_SB_SAFEPOINT
202 thread->selfptr = thread;
205 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
208 /* Signal handlers are run on the control stack, so if it is exhausted
209 * we had better use an alternate stack for whatever signal tells us
210 * we've exhausted it */
211 sigstack.ss_sp=((void *) thread)+dynamic_values_bytes;
213 sigstack.ss_size = 32*SIGSTKSZ;
214 sigaltstack(&sigstack,0);
217 return 1; /* success */
220 int arch_os_thread_cleanup(struct thread *thread) {
222 #if defined(LISP_FEATURE_SB_THREAD)
223 int n = thread->tls_cookie;
225 /* Set the %%fs register back to 0 and free the ldt by setting it
228 FSHOW_SIGNAL((stderr, "/ TLS: Freeing LDT %x\n", n));
230 __asm__ __volatile__ ("mov %0, %%fs" : : "r"(0));
231 i386_set_ldt(n, NULL, 1);
234 return 1; /* success */
237 #endif /* !LISP_FEATURE_DARWIN */
239 #if defined(LISP_FEATURE_FREEBSD)
240 #if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
242 os_restore_tls_segment_register(os_context_t *context)
244 load_fs(context->uc_mcontext.mc_fs);
249 os_restore_fp_control(os_context_t *context)
251 /* FPU state is saved per context on post-KSE systems.
252 * On earlier systems, it is shared in a whole process.
254 #if defined(__FreeBSD_version) && __FreeBSD_version >= 500040
255 struct envxmm *ex = (struct envxmm *)(context->uc_mcontext.mc_fpstate);
256 __asm__ __volatile__ ("fldcw %0" : : "m" (ex->en_cw));
258 #if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
259 /* Calling this function here may not be good idea. Or rename
260 * function name os_restore_fp_control to os_restore_context or
261 * so, to match the behavior? */
262 os_restore_tls_segment_register(context);
267 #if defined(LISP_FEATURE_OPENBSD)
269 os_restore_fp_control(os_context_t *context)
271 #ifdef OS_OPENBSD_FPSTATE_IN_SIGFRAME
272 struct sigframe *frame = (struct sigframe *)((char*)context -
273 offsetof(struct sigframe, sf_sc));
274 union savefpu *fpu = frame->sf_fpstate;
275 #elif defined(OS_OPENBSD_FPSTATE_IN_SIGCONTEXT)
276 union savefpu *fpu = context->sc_fpstate;
279 if (openbsd_use_fxsave)
280 __asm__ __volatile__ ("fldcw %0" : : "m" (fpu->sv_xmm.sv_env.en_cw));
282 __asm__ __volatile__ ("fldcw %0" : : "m" (fpu->sv_87.sv_env.en_cw));