2 * Copyright (c) 1992 Terrence R. Lambert.
3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
34 * from: src/sys/i386/i386/machdep.c,v 1.385.2.3 2000/05/10 02:04:46 obrien
35 * JNPR: pm_machdep.c,v 1.9.2.1 2007/08/16 15:59:10 girish
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include "opt_compat.h"
42 #include "opt_cputype.h"
44 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/sysent.h>
49 #include <sys/signalvar.h>
51 #include <sys/imgact.h>
52 #include <sys/ucontext.h>
54 #include <sys/syscallsubr.h>
55 #include <sys/sysproto.h>
56 #include <sys/ptrace.h>
57 #include <sys/syslog.h>
60 #include <vm/vm_map.h>
61 #include <vm/vm_extern.h>
64 #include <machine/reg.h>
65 #include <machine/md_var.h>
66 #include <machine/sigframe.h>
67 #include <machine/vmparam.h>
68 #include <sys/vnode.h>
69 #include <fs/pseudofs/pseudofs.h>
70 #include <fs/procfs/procfs.h>
72 #define UCONTEXT_MAGIC 0xACEDBADE
75 * Send an interrupt to process.
77 * Stack is set up to allow sigcode stored
78 * at top to call routine, followed by kcall
79 * to sigreturn routine below. After sigreturn
80 * resets the signal mask, the stack, and the
81 * frame pointer, it returns to the user
85 sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
89 struct trapframe *regs;
91 struct sigframe sf, *sfp;
97 PROC_LOCK_ASSERT(p, MA_OWNED);
100 mtx_assert(&psp->ps_mtx, MA_OWNED);
103 oonstack = sigonstack(regs->sp);
105 /* save user context */
106 bzero(&sf, sizeof(struct sigframe));
107 sf.sf_uc.uc_sigmask = *mask;
108 sf.sf_uc.uc_stack = td->td_sigstk;
109 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
110 sf.sf_uc.uc_mcontext.mc_pc = regs->pc;
111 sf.sf_uc.uc_mcontext.mullo = regs->mullo;
112 sf.sf_uc.uc_mcontext.mulhi = regs->mulhi;
113 sf.sf_uc.uc_mcontext.mc_regs[0] = UCONTEXT_MAGIC; /* magic number */
114 bcopy((void *)®s->ast, (void *)&sf.sf_uc.uc_mcontext.mc_regs[1],
115 sizeof(sf.sf_uc.uc_mcontext.mc_regs) - sizeof(register_t));
116 sf.sf_uc.uc_mcontext.mc_fpused = td->td_md.md_flags & MDTD_FPUSED;
117 if (sf.sf_uc.uc_mcontext.mc_fpused) {
118 /* if FPU has current state, save it first */
119 if (td == PCPU_GET(fpcurthread))
120 MipsSaveCurFPState(td);
121 bcopy((void *)&td->td_frame->f0,
122 (void *)sf.sf_uc.uc_mcontext.mc_fpregs,
123 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
126 /* Allocate and validate space for the signal handler context. */
127 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
128 SIGISMEMBER(psp->ps_sigonstack, sig)) {
129 sfp = (struct sigframe *)((vm_offset_t)(td->td_sigstk.ss_sp +
130 td->td_sigstk.ss_size - sizeof(struct sigframe))
131 & ~(sizeof(__int64_t) - 1));
133 sfp = (struct sigframe *)((vm_offset_t)(regs->sp -
134 sizeof(struct sigframe)) & ~(sizeof(__int64_t) - 1));
136 /* Translate the signal if appropriate */
137 if (p->p_sysent->sv_sigtbl) {
138 if (sig <= p->p_sysent->sv_sigsize)
139 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
142 /* Build the argument list for the signal handler. */
144 regs->a2 = (register_t)(intptr_t)&sfp->sf_uc;
145 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
146 /* Signal handler installed with SA_SIGINFO. */
147 regs->a1 = (register_t)(intptr_t)&sfp->sf_si;
148 /* sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; */
150 /* fill siginfo structure */
151 sf.sf_si.si_signo = sig;
152 sf.sf_si.si_code = ksi->ksi_code;
153 sf.sf_si.si_addr = (void*)(intptr_t)regs->badvaddr;
155 /* Old FreeBSD-style arguments. */
156 regs->a1 = ksi->ksi_code;
157 regs->a3 = regs->badvaddr;
158 /* sf.sf_ahu.sf_handler = catcher; */
161 mtx_unlock(&psp->ps_mtx);
165 * Copy the sigframe out to the user's stack.
167 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
169 * Something is wrong with the stack pointer.
170 * ...Kill the process.
176 regs->pc = (register_t)(intptr_t)catcher;
177 regs->t9 = (register_t)(intptr_t)catcher;
178 regs->sp = (register_t)(intptr_t)sfp;
180 * Signal trampoline code is at base of user stack.
182 regs->ra = (register_t)(intptr_t)PS_STRINGS - *(p->p_sysent->sv_szsigcode);
184 mtx_lock(&psp->ps_mtx);
189 * Build siginfo_t for SA thread
192 cpu_thread_siginfo(int sig, u_long code, siginfo_t *si)
199 PROC_LOCK_ASSERT(p, MA_OWNED);
201 bzero(si, sizeof(*si));
204 /* XXXKSE fill other fields */
209 * System call to cleanup state after a signal
210 * has been taken. Reset signal mask and
211 * stack state from context left by sendsig (above).
212 * Return to previous pc as specified by
213 * context left by sendsig.
216 sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
218 struct trapframe *regs;
225 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
232 if (ucp->uc_mcontext.mc_regs[ZERO] != UCONTEXT_MAGIC) {
233 printf("sigreturn: pid %d, ucp %p\n", td->td_proc->p_pid, ucp);
234 printf(" old sp %p ra %p pc %p\n",
235 (void *)(intptr_t)regs->sp, (void *)(intptr_t)regs->ra, (void *)(intptr_t)regs->pc);
236 printf(" new sp %p ra %p pc %p z %p\n",
237 (void *)(intptr_t)ucp->uc_mcontext.mc_regs[SP],
238 (void *)(intptr_t)ucp->uc_mcontext.mc_regs[RA],
239 (void *)(intptr_t)ucp->uc_mcontext.mc_regs[PC],
240 (void *)(intptr_t)ucp->uc_mcontext.mc_regs[ZERO]);
245 bcopy((const void *)&ucp->uc_mcontext.mc_regs[1], (void *)®s->ast,
246 sizeof(ucp->uc_mcontext.mc_regs) - sizeof(register_t));
248 if (ucp->uc_mcontext.mc_fpused)
249 bcopy((const void *)ucp->uc_mcontext.mc_fpregs,
250 (void *)&td->td_frame->f0,
251 sizeof(ucp->uc_mcontext.mc_fpregs));
253 regs->pc = ucp->uc_mcontext.mc_pc;
254 regs->mullo = ucp->uc_mcontext.mullo;
255 regs->mulhi = ucp->uc_mcontext.mulhi;
257 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
264 ptrace_set_pc(struct thread *td, unsigned long addr)
266 td->td_frame->pc = (register_t) addr;
271 ptrace_read_int(struct thread *td, off_t addr, int *v)
276 PROC_LOCK_ASSERT(td->td_proc, MA_NOTOWNED);
277 iov.iov_base = (caddr_t) v;
278 iov.iov_len = sizeof(int);
281 uio.uio_offset = (off_t)addr;
282 uio.uio_resid = sizeof(int);
283 uio.uio_segflg = UIO_SYSSPACE;
284 uio.uio_rw = UIO_READ;
286 return proc_rwmem(td->td_proc, &uio);
290 ptrace_write_int(struct thread *td, off_t addr, int v)
295 PROC_LOCK_ASSERT(td->td_proc, MA_NOTOWNED);
296 iov.iov_base = (caddr_t) &v;
297 iov.iov_len = sizeof(int);
300 uio.uio_offset = (off_t)addr;
301 uio.uio_resid = sizeof(int);
302 uio.uio_segflg = UIO_SYSSPACE;
303 uio.uio_rw = UIO_WRITE;
305 return proc_rwmem(td->td_proc, &uio);
309 ptrace_single_step(struct thread *td)
312 struct trapframe *locr0 = td->td_frame;
314 int bpinstr = MIPS_BREAK_SSTEP;
321 * Fetch what's at the current location.
323 ptrace_read_int(td, (off_t)locr0->pc, &curinstr);
325 /* compute next address after current location */
327 va = MipsEmulateBranch(locr0, locr0->pc, locr0->fsr,
328 (uintptr_t)&curinstr);
332 if (td->td_md.md_ss_addr) {
333 printf("SS %s (%d): breakpoint already set at %x (va %x)\n",
334 p->p_comm, p->p_pid, td->td_md.md_ss_addr, va); /* XXX */
337 td->td_md.md_ss_addr = va;
339 * Fetch what's at the current location.
341 ptrace_read_int(td, (off_t)va, &td->td_md.md_ss_instr);
344 * Store breakpoint instruction at the "next" location now.
346 i = ptrace_write_int (td, va, bpinstr);
349 * The sync'ing of I & D caches is done by procfs_domem()
350 * through procfs_rwmem().
357 printf("SS %s (%d): breakpoint set at %x: %x (pc %x) br %x\n",
358 p->p_comm, p->p_pid, p->p_md.md_ss_addr,
359 p->p_md.md_ss_instr, locr0->pc, curinstr); /* XXX */
366 makectx(struct trapframe *tf, struct pcb *pcb)
369 pcb->pcb_regs.ra = tf->ra;
370 pcb->pcb_regs.pc = tf->pc;
371 pcb->pcb_regs.sp = tf->sp;
375 fill_regs(struct thread *td, struct reg *regs)
377 memcpy(regs, td->td_frame, sizeof(struct reg));
382 set_regs(struct thread *td, struct reg *regs)
387 f = (struct trapframe *) td->td_frame;
389 * Don't allow the user to change SR
392 memcpy(td->td_frame, regs, sizeof(struct reg));
398 get_mcontext(struct thread *td, mcontext_t *mcp, int flags)
400 struct trapframe *tp;
403 PROC_LOCK(curthread->td_proc);
404 mcp->mc_onstack = sigonstack(tp->sp);
405 PROC_UNLOCK(curthread->td_proc);
406 bcopy((void *)&td->td_frame->zero, (void *)&mcp->mc_regs,
407 sizeof(mcp->mc_regs));
409 mcp->mc_fpused = td->td_md.md_flags & MDTD_FPUSED;
410 if (mcp->mc_fpused) {
411 bcopy((void *)&td->td_frame->f0, (void *)&mcp->mc_fpregs,
412 sizeof(mcp->mc_fpregs));
414 if (flags & GET_MC_CLEAR_RET) {
415 mcp->mc_regs[V0] = 0;
416 mcp->mc_regs[V1] = 0;
417 mcp->mc_regs[A3] = 0;
420 mcp->mc_pc = td->td_frame->pc;
421 mcp->mullo = td->td_frame->mullo;
422 mcp->mulhi = td->td_frame->mulhi;
423 mcp->mc_tls = td->td_md.md_tls;
428 set_mcontext(struct thread *td, const mcontext_t *mcp)
430 struct trapframe *tp;
433 bcopy((void *)&mcp->mc_regs, (void *)&td->td_frame->zero,
434 sizeof(mcp->mc_regs));
436 td->td_md.md_flags = mcp->mc_fpused & MDTD_FPUSED;
437 if (mcp->mc_fpused) {
438 bcopy((void *)&mcp->mc_fpregs, (void *)&td->td_frame->f0,
439 sizeof(mcp->mc_fpregs));
441 td->td_frame->pc = mcp->mc_pc;
442 td->td_frame->mullo = mcp->mullo;
443 td->td_frame->mulhi = mcp->mulhi;
444 td->td_md.md_tls = mcp->mc_tls;
445 /* Dont let user to set any bits in Status and casue registers */
451 fill_fpregs(struct thread *td, struct fpreg *fpregs)
453 if (td == PCPU_GET(fpcurthread))
454 MipsSaveCurFPState(td);
455 memcpy(fpregs, &td->td_frame->f0, sizeof(struct fpreg));
460 set_fpregs(struct thread *td, struct fpreg *fpregs)
462 if (PCPU_GET(fpcurthread) == td)
463 PCPU_SET(fpcurthread, (struct thread *)0);
464 memcpy(&td->td_frame->f0, fpregs, sizeof(struct fpreg));
470 * Clear registers on exec
471 * $sp is set to the stack pointer passed in. $pc is set to the entry
472 * point given by the exec_package passed in, as is $t9 (used for PIC
473 * code by the MIPS elf abi).
476 exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
479 bzero((caddr_t)td->td_frame, sizeof(struct trapframe));
482 * The stack pointer has to be aligned to accommodate the largest
483 * datatype at minimum. This probably means it should be 16-byte
484 * aligned, but for now we're 8-byte aligning it.
486 td->td_frame->sp = ((register_t) stack) & ~(sizeof(__int64_t) - 1);
489 * If we're running o32 or n32 programs but have 64-bit registers,
490 * GCC may use stack-relative addressing near the top of user
491 * address space that, due to sign extension, will yield an
492 * invalid address. For instance, if sp is 0x7fffff00 then GCC
493 * might do something like this to load a word from 0x7ffffff0:
498 * On systems with 64-bit registers, sp is sign-extended to
499 * 0xffffffff80007f00 and the load is instead done from
500 * 0xffffffff7ffffff0.
502 * To prevent this, we subtract 64K from the stack pointer here.
504 * For consistency, we should just always do this unless we're
505 * running n64 programs. For now, since we don't support
506 * COMPAT_FREEBSD32 on n64 kernels, we just do it unless we're
507 * running n64 kernels.
509 #if !defined(__mips_n64)
510 td->td_frame->sp -= 65536;
513 td->td_frame->pc = imgp->entry_addr & ~3;
514 td->td_frame->t9 = imgp->entry_addr & ~3; /* abicall req */
515 td->td_frame->sr = MIPS_SR_KSU_USER | MIPS_SR_EXL | MIPS_SR_INT_IE |
516 (mips_rd_status() & MIPS_SR_INT_MASK);
517 #if defined(__mips_n32)
518 td->td_frame->sr |= MIPS_SR_PX;
519 #elif defined(__mips_n64)
520 td->td_frame->sr |= MIPS_SR_PX | MIPS_SR_UX | MIPS_SR_KX;
523 td->td_frame->sr |= MIPS_SR_COP_2_BIT | MIPS_SR_PX | MIPS_SR_UX |
524 MIPS_SR_KX | MIPS_SR_SX;
527 * FREEBSD_DEVELOPERS_FIXME:
528 * Setup any other CPU-Specific registers (Not MIPS Standard)
529 * and/or bits in other standard MIPS registers (if CPU-Specific)
534 * Set up arguments for the rtld-capable crt0:
536 * a1 rtld cleanup (filled in by dynamic loader)
537 * a2 rtld object (filled in by dynamic loader)
540 td->td_frame->a0 = (register_t) stack;
541 td->td_frame->a1 = 0;
542 td->td_frame->a2 = 0;
543 td->td_frame->a3 = (register_t)imgp->ps_strings;
545 td->td_md.md_flags &= ~MDTD_FPUSED;
546 if (PCPU_GET(fpcurthread) == td)
547 PCPU_SET(fpcurthread, (struct thread *)0);
548 td->td_md.md_ss_addr = 0;
552 ptrace_clear_single_step(struct thread *td)
558 PROC_LOCK_ASSERT(p, MA_OWNED);
559 if (!td->td_md.md_ss_addr)
563 * Restore original instruction and clear BP
565 i = ptrace_write_int (td, td->td_md.md_ss_addr, td->td_md.md_ss_instr);
567 /* The sync'ing of I & D caches is done by procfs_domem(). */
570 log(LOG_ERR, "SS %s %d: can't restore instruction at %x: %x\n",
571 p->p_comm, p->p_pid, td->td_md.md_ss_addr,
572 td->td_md.md_ss_instr);
574 td->td_md.md_ss_addr = 0;