1/*-
2 * Copyright (c) 2002 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/ia64/ia32/ia32_signal.c 115084 2003-05-16 21:26:42Z marcel $
27 */
28
29#define __ELF_WORD_SIZE 32
30
31#include <sys/param.h>
32#include <sys/exec.h>
33#include <sys/fcntl.h>
34#include <sys/imgact.h>

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47#include <sys/stat.h>
48#include <sys/sx.h>
49#include <sys/syscall.h>
50#include <sys/sysctl.h>
51#include <sys/sysent.h>
52#include <sys/vnode.h>
53#include <sys/imgact_elf.h>
54
55#include <machine/frame.h>
56#include <machine/md_var.h>
57#include <machine/pcb.h>
58
59#include <vm/vm.h>
60#include <vm/vm_kern.h>
61#include <vm/vm_param.h>
62#include <vm/pmap.h>
63#include <vm/vm_map.h>
64#include <vm/vm_object.h>
65#include <vm/vm_extern.h>
66
67#include <ia64/ia32/ia32_util.h>
68#include <i386/include/psl.h>
69#include <i386/include/segments.h>
70#include <i386/include/specialreg.h>
71
72static register_t *ia32_copyout_strings(struct image_params *imgp);
73static void ia32_setregs(struct thread *td, u_long entry, u_long stack,
74 u_long ps_strings);
75
76extern struct sysent ia32_sysent[];
77
78static char ia32_sigcode[] = {
79 0xff, 0x54, 0x24, 0x10, /* call *SIGF_HANDLER(%esp) */
80 0x8d, 0x44, 0x24, 0x14, /* lea SIGF_UC(%esp),%eax */
81 0x50, /* pushl %eax */
82 0xf7, 0x40, 0x54, 0x00, 0x00, 0x02, 0x02, /* testl $PSL_VM,UC_EFLAGS(%eax) */
83 0x75, 0x03, /* jne 9f */
84 0x8e, 0x68, 0x14, /* movl UC_GS(%eax),%gs */
85 0xb8, 0x57, 0x01, 0x00, 0x00, /* 9: movl $SYS_sigreturn,%eax */
86 0x50, /* pushl %eax */
87 0xcd, 0x80, /* int $0x80 */
88 0xeb, 0xfe, /* 0: jmp 0b */
89 0
90};
91static int ia32_szsigcode = sizeof(ia32_sigcode);
92
93struct sysentvec ia32_freebsd_sysvec = {
94 SYS_MAXSYSCALL,
95 ia32_sysent,
96 0,
97 0,
98 NULL,
99 0,
100 NULL,
101 NULL,
102 elf32_freebsd_fixup,
103 sendsig,
104 ia32_sigcode,
105 &ia32_szsigcode,
106 NULL,
107 "FreeBSD ELF",
108 elf32_coredump,
109 NULL,
110 IA32_MINSIGSTKSZ,
111 IA32_PAGE_SIZE,
112 0,
113 IA32_USRSTACK,
114 IA32_USRSTACK,
115 IA32_PS_STRINGS,
116 VM_PROT_ALL,
117 ia32_copyout_strings,
118 ia32_setregs
119};

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142 int szsigcode;
143
144 /*
145 * Calculate string base and vector table pointers.
146 * Also deal with signal trampoline code for this exec type.
147 */
148 arginfo = (struct ia32_ps_strings *)IA32_PS_STRINGS;
149 szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
150 destp = (caddr_t)arginfo - szsigcode - IA32_USRSPACE -
151 roundup((ARG_MAX - imgp->stringspace), sizeof(char *));
152
153 /*
154 * install sigcode
155 */
156 if (szsigcode)
157 copyout(imgp->proc->p_sysent->sv_sigcode,
158 ((caddr_t)arginfo - szsigcode), szsigcode);
159

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182 * the arg and env vector sets
183 */
184 vectp = (u_int32_t *)
185 (destp - (imgp->argc + imgp->envc + 2) * sizeof(u_int32_t));
186
187 /*
188 * vectp also becomes our initial stack base
189 */
190 vectp = (void*)((uintptr_t)vectp & ~15);
191 stack_base = vectp;
192
193 stringp = imgp->stringbase;
194 argc = imgp->argc;
195 envc = imgp->envc;
196
197 /*
198 * Copy out strings - arguments and environment.

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235 suword32(vectp, 0);
236
237 return ((register_t *)stack_base);
238}
239
240static void
241ia32_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
242{
243 struct trapframe *tf = td->td_frame;
244 vm_offset_t gdt, ldt;
245 u_int64_t codesel, datasel, ldtsel;
246 u_int64_t codeseg, dataseg, gdtseg, ldtseg;
247 struct segment_descriptor desc;
248 struct vmspace *vmspace = td->td_proc->p_vmspace;
249
250 exec_setregs(td, entry, stack, ps_strings);
251
252 /* Non-syscall frames are cleared by exec_setregs() */
253 if (tf->tf_flags & FRAME_SYSCALL) {
254 bzero(&tf->tf_scratch, sizeof(tf->tf_scratch));
255 bzero(&tf->tf_scratch_fp, sizeof(tf->tf_scratch_fp));
256 } else
257 tf->tf_special.ndirty = 0;
258
259 tf->tf_special.psr |= IA64_PSR_IS;
260 tf->tf_special.sp = stack;
261
262 /* Point the RSE backstore to something harmless. */
263 tf->tf_special.bspstore = (IA32_PS_STRINGS - ia32_szsigcode -
264 IA32_USRSPACE + 15) & ~15;
265
266 codesel = LSEL(LUCODE_SEL, SEL_UPL);
267 datasel = LSEL(LUDATA_SEL, SEL_UPL);
268 ldtsel = GSEL(GLDT_SEL, SEL_UPL);
269
270 /* Setup ia32 segment registers. */
271 tf->tf_scratch.gr16 = (datasel << 48) | (datasel << 32) |
272 (datasel << 16) | datasel;
273 tf->tf_scratch.gr17 = (ldtsel << 32) | (datasel << 16) | codesel;
274
275 /*
276 * Build the GDT and LDT.
277 */
278 gdt = IA32_USRSTACK;
279 vm_map_find(&vmspace->vm_map, 0, 0, &gdt, IA32_PAGE_SIZE << 1, 0,
280 VM_PROT_ALL, VM_PROT_ALL, 0);
281 ldt = gdt + IA32_PAGE_SIZE;
282
283 desc.sd_lolimit = 8*NLDT-1;
284 desc.sd_lobase = ldt & 0xffffff;
285 desc.sd_type = SDT_SYSLDT;
286 desc.sd_dpl = SEL_UPL;
287 desc.sd_p = 1;
288 desc.sd_hilimit = 0;
289 desc.sd_def32 = 0;

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313 + (1L << 63); /* page granularity */
314 dataseg = 0 /* base */
315 + (((IA32_USRSTACK >> 12) - 1) << 32) /* limit */
316 + ((long)SDT_MEMRWA << 52)
317 + ((long)SEL_UPL << 57)
318 + (1L << 59) /* present */
319 + (1L << 62) /* 32 bits */
320 + (1L << 63); /* page granularity */
321
322 tf->tf_scratch.csd = codeseg;
323 tf->tf_scratch.ssd = dataseg;
324 tf->tf_scratch.gr24 = dataseg; /* ESD */
325 tf->tf_scratch.gr27 = dataseg; /* DSD */
326 tf->tf_scratch.gr28 = dataseg; /* FSD */
327 tf->tf_scratch.gr29 = dataseg; /* GSD */
328
329 gdtseg = gdt /* base */
330 + ((8L*NGDT - 1) << 32) /* limit */
331 + ((long)SDT_SYSNULL << 52)
332 + ((long)SEL_UPL << 57)
333 + (1L << 59) /* present */
334 + (0L << 62) /* 16 bits */
335 + (0L << 63); /* byte granularity */
336 ldtseg = ldt /* base */
337 + ((8L*NLDT - 1) << 32) /* limit */
338 + ((long)SDT_SYSLDT << 52)
339 + ((long)SEL_UPL << 57)
340 + (1L << 59) /* present */
341 + (0L << 62) /* 16 bits */
342 + (0L << 63); /* byte granularity */
343
344 tf->tf_scratch.gr30 = ldtseg; /* LDTD */
345 tf->tf_scratch.gr31 = gdtseg; /* GDTD */
346
347 /* Set ia32 control registers on this processor. */
348 ia64_set_cflg(CR0_PE | CR0_PG | ((long)(CR4_XMM | CR4_FXSR) << 32));
349 ia64_set_eflag(PSL_USER);
350
351 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
352 tf->tf_scratch.gr11 = IA32_PS_STRINGS;
353
354 /*
355 * XXX - Linux emulator
356 * Make sure sure edx is 0x0 on entry. Linux binaries depend
357 * on it.
358 */
359 td->td_retval[1] = 0;
360}
361
362void
363ia32_restorectx(struct pcb *pcb)
364{
365
366 ia64_set_cflg(pcb->pcb_ia32_cflg);
367 ia64_set_eflag(pcb->pcb_ia32_eflag);
368 ia64_set_fcr(pcb->pcb_ia32_fcr);
369 ia64_set_fdr(pcb->pcb_ia32_fdr);
370 ia64_set_fir(pcb->pcb_ia32_fir);
371 ia64_set_fsr(pcb->pcb_ia32_fsr);
372}
373
374void
375ia32_savectx(struct pcb *pcb)
376{
377
378 pcb->pcb_ia32_cflg = ia64_get_cflg();
379 pcb->pcb_ia32_eflag = ia64_get_eflag();
380 pcb->pcb_ia32_fcr = ia64_get_fcr();
381 pcb->pcb_ia32_fdr = ia64_get_fdr();
382 pcb->pcb_ia32_fir = ia64_get_fir();
383 pcb->pcb_ia32_fsr = ia64_get_fsr();
384}