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/* $NetBSD: arm32_machdep.c,v 1.44 2004/03/24 15:34:47 atatat Exp $ */
/*-
* Copyright (c) 2004 Olivier Houchard
* Copyright (c) 1994-1998 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Brinicombe
* for the NetBSD Project.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Machine dependant functions for kernel setup
*
* Created : 17/09/94
* Updated : 18/04/01 updated for new wscons
*/
#include "opt_compat.h"
#include "opt_ddb.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/arm/arm/machdep.c 236238 2012-05-29 14:50:21Z fabient $");
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/bus.h>
#include <sys/cons.h>
#include <sys/cpu.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/pcpu.h>
#include <sys/ptrace.h>
#include <sys/signalvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysent.h>
#include <sys/sysproto.h>
#include <sys/uio.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
#include <machine/armreg.h>
#include <machine/cpu.h>
#include <machine/machdep.h>
#include <machine/md_var.h>
#include <machine/metadata.h>
#include <machine/pcb.h>
#include <machine/pmap.h>
#include <machine/reg.h>
#include <machine/trap.h>
#include <machine/undefined.h>
#include <machine/vmparam.h>
#include <machine/sysarch.h>
uint32_t cpu_reset_address = 0;
int cold = 1;
vm_offset_t vector_page;
long realmem = 0;
int (*_arm_memcpy)(void *, void *, int, int) = NULL;
int (*_arm_bzero)(void *, int, int) = NULL;
int _min_memcpy_size = 0;
int _min_bzero_size = 0;
extern int *end;
#ifdef DDB
extern vm_offset_t ksym_start, ksym_end;
#endif
void
sendsig(catcher, ksi, mask)
sig_t catcher;
ksiginfo_t *ksi;
sigset_t *mask;
{
struct thread *td;
struct proc *p;
struct trapframe *tf;
struct sigframe *fp, frame;
struct sigacts *psp;
int onstack;
int sig;
int code;
td = curthread;
p = td->td_proc;
PROC_LOCK_ASSERT(p, MA_OWNED);
sig = ksi->ksi_signo;
code = ksi->ksi_code;
psp = p->p_sigacts;
mtx_assert(&psp->ps_mtx, MA_OWNED);
tf = td->td_frame;
onstack = sigonstack(tf->tf_usr_sp);
CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
catcher, sig);
/* Allocate and validate space for the signal handler context. */
if ((td->td_flags & TDP_ALTSTACK) != 0 && !(onstack) &&
SIGISMEMBER(psp->ps_sigonstack, sig)) {
fp = (struct sigframe *)(td->td_sigstk.ss_sp +
td->td_sigstk.ss_size);
#if defined(COMPAT_43)
td->td_sigstk.ss_flags |= SS_ONSTACK;
#endif
} else
fp = (struct sigframe *)td->td_frame->tf_usr_sp;
/* make room on the stack */
fp--;
/* make the stack aligned */
fp = (struct sigframe *)STACKALIGN(fp);
/* Populate the siginfo frame. */
get_mcontext(td, &frame.sf_uc.uc_mcontext, 0);
frame.sf_si = ksi->ksi_info;
frame.sf_uc.uc_sigmask = *mask;
frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK )
? ((onstack) ? SS_ONSTACK : 0) : SS_DISABLE;
frame.sf_uc.uc_stack = td->td_sigstk;
mtx_unlock(&psp->ps_mtx);
PROC_UNLOCK(td->td_proc);
/* Copy the sigframe out to the user's stack. */
if (copyout(&frame, fp, sizeof(*fp)) != 0) {
/* Process has trashed its stack. Kill it. */
CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
PROC_LOCK(p);
sigexit(td, SIGILL);
}
/* Translate the signal if appropriate. */
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
/*
* Build context to run handler in. We invoke the handler
* directly, only returning via the trampoline. Note the
* trampoline version numbers are coordinated with machine-
* dependent code in libc.
*/
tf->tf_r0 = sig;
tf->tf_r1 = (register_t)&fp->sf_si;
tf->tf_r2 = (register_t)&fp->sf_uc;
/* the trampoline uses r5 as the uc address */
tf->tf_r5 = (register_t)&fp->sf_uc;
tf->tf_pc = (register_t)catcher;
tf->tf_usr_sp = (register_t)fp;
tf->tf_usr_lr = (register_t)(PS_STRINGS - *(p->p_sysent->sv_szsigcode));
CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_usr_lr,
tf->tf_usr_sp);
PROC_LOCK(p);
mtx_lock(&psp->ps_mtx);
}
struct kva_md_info kmi;
/*
* arm32_vector_init:
*
* Initialize the vector page, and select whether or not to
* relocate the vectors.
*
* NOTE: We expect the vector page to be mapped at its expected
* destination.
*/
extern unsigned int page0[], page0_data[];
void
arm_vector_init(vm_offset_t va, int which)
{
unsigned int *vectors = (int *) va;
unsigned int *vectors_data = vectors + (page0_data - page0);
int vec;
/*
* Loop through the vectors we're taking over, and copy the
* vector's insn and data word.
*/
for (vec = 0; vec < ARM_NVEC; vec++) {
if ((which & (1 << vec)) == 0) {
/* Don't want to take over this vector. */
continue;
}
vectors[vec] = page0[vec];
vectors_data[vec] = page0_data[vec];
}
/* Now sync the vectors. */
cpu_icache_sync_range(va, (ARM_NVEC * 2) * sizeof(u_int));
vector_page = va;
if (va == ARM_VECTORS_HIGH) {
/*
* Assume the MD caller knows what it's doing here, and
* really does want the vector page relocated.
*
* Note: This has to be done here (and not just in
* cpu_setup()) because the vector page needs to be
* accessible *before* cpu_startup() is called.
* Think ddb(9) ...
*
* NOTE: If the CPU control register is not readable,
* this will totally fail! We'll just assume that
* any system that has high vector support has a
* readable CPU control register, for now. If we
* ever encounter one that does not, we'll have to
* rethink this.
*/
cpu_control(CPU_CONTROL_VECRELOC, CPU_CONTROL_VECRELOC);
}
}
static void
cpu_startup(void *dummy)
{
struct pcb *pcb = thread0.td_pcb;
#ifndef ARM_CACHE_LOCK_ENABLE
vm_page_t m;
#endif
cpu_setup("");
identify_arm_cpu();
printf("real memory = %ju (%ju MB)\n", (uintmax_t)ptoa(physmem),
(uintmax_t)ptoa(physmem) / 1048576);
realmem = physmem;
/*
* Display the RAM layout.
*/
if (bootverbose) {
int indx;
printf("Physical memory chunk(s):\n");
for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) {
vm_paddr_t size;
size = phys_avail[indx + 1] - phys_avail[indx];
printf("%#08jx - %#08jx, %ju bytes (%ju pages)\n",
(uintmax_t)phys_avail[indx],
(uintmax_t)phys_avail[indx + 1] - 1,
(uintmax_t)size, (uintmax_t)size / PAGE_SIZE);
}
}
vm_ksubmap_init(&kmi);
printf("avail memory = %ju (%ju MB)\n",
(uintmax_t)ptoa(cnt.v_free_count),
(uintmax_t)ptoa(cnt.v_free_count) / 1048576);
bufinit();
vm_pager_bufferinit();
pcb->un_32.pcb32_und_sp = (u_int)thread0.td_kstack +
USPACE_UNDEF_STACK_TOP;
pcb->un_32.pcb32_sp = (u_int)thread0.td_kstack +
USPACE_SVC_STACK_TOP;
vector_page_setprot(VM_PROT_READ);
pmap_set_pcb_pagedir(pmap_kernel(), pcb);
pmap_postinit();
#ifdef ARM_CACHE_LOCK_ENABLE
pmap_kenter_user(ARM_TP_ADDRESS, ARM_TP_ADDRESS);
arm_lock_cache_line(ARM_TP_ADDRESS);
#else
m = vm_page_alloc(NULL, 0, VM_ALLOC_NOOBJ | VM_ALLOC_ZERO);
pmap_kenter_user(ARM_TP_ADDRESS, VM_PAGE_TO_PHYS(m));
#endif
*(uint32_t *)ARM_RAS_START = 0;
*(uint32_t *)ARM_RAS_END = 0xffffffff;
}
SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL);
/*
* Flush the D-cache for non-DMA I/O so that the I-cache can
* be made coherent later.
*/
void
cpu_flush_dcache(void *ptr, size_t len)
{
cpu_dcache_wb_range((uintptr_t)ptr, len);
cpu_l2cache_wb_range((uintptr_t)ptr, len);
}
/* Get current clock frequency for the given cpu id. */
int
cpu_est_clockrate(int cpu_id, uint64_t *rate)
{
return (ENXIO);
}
void
cpu_idle(int busy)
{
cpu_sleep(0);
}
int
cpu_idle_wakeup(int cpu)
{
return (0);
}
int
fill_regs(struct thread *td, struct reg *regs)
{
struct trapframe *tf = td->td_frame;
bcopy(&tf->tf_r0, regs->r, sizeof(regs->r));
regs->r_sp = tf->tf_usr_sp;
regs->r_lr = tf->tf_usr_lr;
regs->r_pc = tf->tf_pc;
regs->r_cpsr = tf->tf_spsr;
return (0);
}
int
fill_fpregs(struct thread *td, struct fpreg *regs)
{
bzero(regs, sizeof(*regs));
return (0);
}
int
set_regs(struct thread *td, struct reg *regs)
{
struct trapframe *tf = td->td_frame;
bcopy(regs->r, &tf->tf_r0, sizeof(regs->r));
tf->tf_usr_sp = regs->r_sp;
tf->tf_usr_lr = regs->r_lr;
tf->tf_pc = regs->r_pc;
tf->tf_spsr &= ~PSR_FLAGS;
tf->tf_spsr |= regs->r_cpsr & PSR_FLAGS;
return (0);
}
int
set_fpregs(struct thread *td, struct fpreg *regs)
{
return (0);
}
int
fill_dbregs(struct thread *td, struct dbreg *regs)
{
return (0);
}
int
set_dbregs(struct thread *td, struct dbreg *regs)
{
return (0);
}
static int
ptrace_read_int(struct thread *td, vm_offset_t addr, u_int32_t *v)
{
struct iovec iov;
struct uio uio;
PROC_LOCK_ASSERT(td->td_proc, MA_NOTOWNED);
iov.iov_base = (caddr_t) v;
iov.iov_len = sizeof(u_int32_t);
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = (off_t)addr;
uio.uio_resid = sizeof(u_int32_t);
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_READ;
uio.uio_td = td;
return proc_rwmem(td->td_proc, &uio);
}
static int
ptrace_write_int(struct thread *td, vm_offset_t addr, u_int32_t v)
{
struct iovec iov;
struct uio uio;
PROC_LOCK_ASSERT(td->td_proc, MA_NOTOWNED);
iov.iov_base = (caddr_t) &v;
iov.iov_len = sizeof(u_int32_t);
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_offset = (off_t)addr;
uio.uio_resid = sizeof(u_int32_t);
uio.uio_segflg = UIO_SYSSPACE;
uio.uio_rw = UIO_WRITE;
uio.uio_td = td;
return proc_rwmem(td->td_proc, &uio);
}
int
ptrace_single_step(struct thread *td)
{
struct proc *p;
int error;
KASSERT(td->td_md.md_ptrace_instr == 0,
("Didn't clear single step"));
p = td->td_proc;
PROC_UNLOCK(p);
error = ptrace_read_int(td, td->td_frame->tf_pc + 4,
&td->td_md.md_ptrace_instr);
if (error)
goto out;
error = ptrace_write_int(td, td->td_frame->tf_pc + 4,
PTRACE_BREAKPOINT);
if (error)
td->td_md.md_ptrace_instr = 0;
td->td_md.md_ptrace_addr = td->td_frame->tf_pc + 4;
out:
PROC_LOCK(p);
return (error);
}
int
ptrace_clear_single_step(struct thread *td)
{
struct proc *p;
if (td->td_md.md_ptrace_instr) {
p = td->td_proc;
PROC_UNLOCK(p);
ptrace_write_int(td, td->td_md.md_ptrace_addr,
td->td_md.md_ptrace_instr);
PROC_LOCK(p);
td->td_md.md_ptrace_instr = 0;
}
return (0);
}
int
ptrace_set_pc(struct thread *td, unsigned long addr)
{
td->td_frame->tf_pc = addr;
return (0);
}
void
cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
{
}
void
spinlock_enter(void)
{
struct thread *td;
register_t cspr;
td = curthread;
if (td->td_md.md_spinlock_count == 0) {
cspr = disable_interrupts(I32_bit | F32_bit);
td->td_md.md_spinlock_count = 1;
td->td_md.md_saved_cspr = cspr;
} else
td->td_md.md_spinlock_count++;
critical_enter();
}
void
spinlock_exit(void)
{
struct thread *td;
register_t cspr;
td = curthread;
critical_exit();
cspr = td->td_md.md_saved_cspr;
td->td_md.md_spinlock_count--;
if (td->td_md.md_spinlock_count == 0)
restore_interrupts(cspr);
}
/*
* Clear registers on exec
*/
void
exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
{
struct trapframe *tf = td->td_frame;
memset(tf, 0, sizeof(*tf));
tf->tf_usr_sp = stack;
tf->tf_usr_lr = imgp->entry_addr;
tf->tf_svc_lr = 0x77777777;
tf->tf_pc = imgp->entry_addr;
tf->tf_spsr = PSR_USR32_MODE;
}
/*
* Get machine context.
*/
int
get_mcontext(struct thread *td, mcontext_t *mcp, int clear_ret)
{
struct trapframe *tf = td->td_frame;
__greg_t *gr = mcp->__gregs;
if (clear_ret & GET_MC_CLEAR_RET)
gr[_REG_R0] = 0;
else
gr[_REG_R0] = tf->tf_r0;
gr[_REG_R1] = tf->tf_r1;
gr[_REG_R2] = tf->tf_r2;
gr[_REG_R3] = tf->tf_r3;
gr[_REG_R4] = tf->tf_r4;
gr[_REG_R5] = tf->tf_r5;
gr[_REG_R6] = tf->tf_r6;
gr[_REG_R7] = tf->tf_r7;
gr[_REG_R8] = tf->tf_r8;
gr[_REG_R9] = tf->tf_r9;
gr[_REG_R10] = tf->tf_r10;
gr[_REG_R11] = tf->tf_r11;
gr[_REG_R12] = tf->tf_r12;
gr[_REG_SP] = tf->tf_usr_sp;
gr[_REG_LR] = tf->tf_usr_lr;
gr[_REG_PC] = tf->tf_pc;
gr[_REG_CPSR] = tf->tf_spsr;
return (0);
}
/*
* Set machine context.
*
* However, we don't set any but the user modifiable flags, and we won't
* touch the cs selector.
*/
int
set_mcontext(struct thread *td, const mcontext_t *mcp)
{
struct trapframe *tf = td->td_frame;
const __greg_t *gr = mcp->__gregs;
tf->tf_r0 = gr[_REG_R0];
tf->tf_r1 = gr[_REG_R1];
tf->tf_r2 = gr[_REG_R2];
tf->tf_r3 = gr[_REG_R3];
tf->tf_r4 = gr[_REG_R4];
tf->tf_r5 = gr[_REG_R5];
tf->tf_r6 = gr[_REG_R6];
tf->tf_r7 = gr[_REG_R7];
tf->tf_r8 = gr[_REG_R8];
tf->tf_r9 = gr[_REG_R9];
tf->tf_r10 = gr[_REG_R10];
tf->tf_r11 = gr[_REG_R11];
tf->tf_r12 = gr[_REG_R12];
tf->tf_usr_sp = gr[_REG_SP];
tf->tf_usr_lr = gr[_REG_LR];
tf->tf_pc = gr[_REG_PC];
tf->tf_spsr = gr[_REG_CPSR];
return (0);
}
/*
* MPSAFE
*/
int
sys_sigreturn(td, uap)
struct thread *td;
struct sigreturn_args /* {
const struct __ucontext *sigcntxp;
} */ *uap;
{
struct sigframe sf;
struct trapframe *tf;
int spsr;
if (uap == NULL)
return (EFAULT);
if (copyin(uap->sigcntxp, &sf, sizeof(sf)))
return (EFAULT);
/*
* Make sure the processor mode has not been tampered with and
* interrupts have not been disabled.
*/
spsr = sf.sf_uc.uc_mcontext.__gregs[_REG_CPSR];
if ((spsr & PSR_MODE) != PSR_USR32_MODE ||
(spsr & (I32_bit | F32_bit)) != 0)
return (EINVAL);
/* Restore register context. */
tf = td->td_frame;
set_mcontext(td, &sf.sf_uc.uc_mcontext);
/* Restore signal mask. */
kern_sigprocmask(td, SIG_SETMASK, &sf.sf_uc.uc_sigmask, NULL, 0);
return (EJUSTRETURN);
}
/*
* Construct a PCB from a trapframe. This is called from kdb_trap() where
* we want to start a backtrace from the function that caused us to enter
* the debugger. We have the context in the trapframe, but base the trace
* on the PCB. The PCB doesn't have to be perfect, as long as it contains
* enough for a backtrace.
*/
void
makectx(struct trapframe *tf, struct pcb *pcb)
{
pcb->un_32.pcb32_r8 = tf->tf_r8;
pcb->un_32.pcb32_r9 = tf->tf_r9;
pcb->un_32.pcb32_r10 = tf->tf_r10;
pcb->un_32.pcb32_r11 = tf->tf_r11;
pcb->un_32.pcb32_r12 = tf->tf_r12;
pcb->un_32.pcb32_pc = tf->tf_pc;
pcb->un_32.pcb32_lr = tf->tf_usr_lr;
pcb->un_32.pcb32_sp = tf->tf_usr_sp;
}
/*
* Fake up a boot descriptor table
*/
vm_offset_t
fake_preload_metadata(void)
{
#ifdef DDB
vm_offset_t zstart = 0, zend = 0;
#endif
vm_offset_t lastaddr;
int i = 0;
static uint32_t fake_preload[35];
fake_preload[i++] = MODINFO_NAME;
fake_preload[i++] = strlen("kernel") + 1;
strcpy((char*)&fake_preload[i++], "kernel");
i += 1;
fake_preload[i++] = MODINFO_TYPE;
fake_preload[i++] = strlen("elf kernel") + 1;
strcpy((char*)&fake_preload[i++], "elf kernel");
i += 2;
fake_preload[i++] = MODINFO_ADDR;
fake_preload[i++] = sizeof(vm_offset_t);
fake_preload[i++] = KERNVIRTADDR;
fake_preload[i++] = MODINFO_SIZE;
fake_preload[i++] = sizeof(uint32_t);
fake_preload[i++] = (uint32_t)&end - KERNVIRTADDR;
#ifdef DDB
if (*(uint32_t *)KERNVIRTADDR == MAGIC_TRAMP_NUMBER) {
fake_preload[i++] = MODINFO_METADATA|MODINFOMD_SSYM;
fake_preload[i++] = sizeof(vm_offset_t);
fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 4);
fake_preload[i++] = MODINFO_METADATA|MODINFOMD_ESYM;
fake_preload[i++] = sizeof(vm_offset_t);
fake_preload[i++] = *(uint32_t *)(KERNVIRTADDR + 8);
lastaddr = *(uint32_t *)(KERNVIRTADDR + 8);
zend = lastaddr;
zstart = *(uint32_t *)(KERNVIRTADDR + 4);
ksym_start = zstart;
ksym_end = zend;
} else
#endif
lastaddr = (vm_offset_t)&end;
fake_preload[i++] = 0;
fake_preload[i] = 0;
preload_metadata = (void *)fake_preload;
return (lastaddr);
}