#include "linux/sched.h"
#include "linux/mm.h"
#include "linux/spinlock.h"
-#include "linux/config.h"
#include "linux/init.h"
#include "linux/ptrace.h"
#include "asm/semaphore.h"
#include "asm/current.h"
#include "asm/irq.h"
#include "sysdep/sigcontext.h"
-#include "user_util.h"
#include "kern_util.h"
+#include "as-layout.h"
+#include "arch.h"
#include "kern.h"
#include "chan_kern.h"
#include "mconsole_kern.h"
goto out;
/* Don't require VM_READ|VM_EXEC for write faults! */
- if(!is_write && !(vma->vm_flags & (VM_READ | VM_EXEC)))
- goto out;
+ if(!is_write && !(vma->vm_flags & (VM_READ | VM_EXEC)))
+ goto out;
do {
survive:
* us unable to handle the page fault gracefully.
*/
out_of_memory:
- if (current->pid == 1) {
+ if (is_init(current)) {
up_read(&mm->mmap_sem);
yield();
down_read(&mm->mmap_sem);
goto out;
}
-void segv_handler(int sig, union uml_pt_regs *regs)
+static void bad_segv(struct faultinfo fi, unsigned long ip)
+{
+ struct siginfo si;
+
+ si.si_signo = SIGSEGV;
+ si.si_code = SEGV_ACCERR;
+ si.si_addr = (void __user *) FAULT_ADDRESS(fi);
+ current->thread.arch.faultinfo = fi;
+ force_sig_info(SIGSEGV, &si, current);
+}
+
+static void segv_handler(int sig, union uml_pt_regs *regs)
{
struct faultinfo * fi = UPT_FAULTINFO(regs);
segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
}
-struct kern_handlers handlinfo_kern = {
- .relay_signal = relay_signal,
- .winch = winch,
- .bus_handler = relay_signal,
- .page_fault = segv_handler,
- .sigio_handler = sigio_handler,
- .timer_handler = timer_handler
-};
/*
* We give a *copy* of the faultinfo in the regs to segv.
* This must be done, since nesting SEGVs could overwrite
* the info in the regs. A pointer to the info then would
* give us bad data!
*/
-unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user, void *sc)
+unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
+ union uml_pt_regs *regs)
{
struct siginfo si;
void *catcher;
int err;
- int is_write = FAULT_WRITE(fi);
- unsigned long address = FAULT_ADDRESS(fi);
+ int is_write = FAULT_WRITE(fi);
+ unsigned long address = FAULT_ADDRESS(fi);
- if(!is_user && (address >= start_vm) && (address < end_vm)){
- flush_tlb_kernel_vm();
- return(0);
- }
- else if(current->mm == NULL)
- panic("Segfault with no mm");
+ if(!is_user && (address >= start_vm) && (address < end_vm)){
+ flush_tlb_kernel_vm();
+ return 0;
+ }
+ else if(current->mm == NULL) {
+ show_regs(container_of(regs, struct pt_regs, regs));
+ panic("Segfault with no mm");
+ }
if (SEGV_IS_FIXABLE(&fi) || SEGV_MAYBE_FIXABLE(&fi))
err = handle_page_fault(address, ip, is_write, is_user, &si.si_code);
catcher = current->thread.fault_catcher;
if(!err)
- return(0);
+ return 0;
else if(catcher != NULL){
current->thread.fault_addr = (void *) address;
do_longjmp(catcher, 1);
}
else if(current->thread.fault_addr != NULL)
panic("fault_addr set but no fault catcher");
- else if(!is_user && arch_fixup(ip, sc))
- return(0);
+ else if(!is_user && arch_fixup(ip, regs))
+ return 0;
- if(!is_user)
+ if(!is_user) {
+ show_regs(container_of(regs, struct pt_regs, regs));
panic("Kernel mode fault at addr 0x%lx, ip 0x%lx",
address, ip);
+ }
if (err == -EACCES) {
si.si_signo = SIGBUS;
si.si_errno = 0;
si.si_code = BUS_ADRERR;
si.si_addr = (void __user *)address;
- current->thread.arch.faultinfo = fi;
+ current->thread.arch.faultinfo = fi;
force_sig_info(SIGBUS, &si, current);
} else if (err == -ENOMEM) {
printk("VM: killing process %s\n", current->comm);
BUG_ON(err != -EFAULT);
si.si_signo = SIGSEGV;
si.si_addr = (void __user *) address;
- current->thread.arch.faultinfo = fi;
+ current->thread.arch.faultinfo = fi;
force_sig_info(SIGSEGV, &si, current);
}
- return(0);
-}
-
-void bad_segv(struct faultinfo fi, unsigned long ip)
-{
- struct siginfo si;
-
- si.si_signo = SIGSEGV;
- si.si_code = SEGV_ACCERR;
- si.si_addr = (void __user *) FAULT_ADDRESS(fi);
- current->thread.arch.faultinfo = fi;
- force_sig_info(SIGSEGV, &si, current);
+ return 0;
}
void relay_signal(int sig, union uml_pt_regs *regs)
if(!UPT_IS_USER(regs)){
if(sig == SIGBUS)
- printk("Bus error - the /dev/shm or /tmp mount likely "
- "just ran out of space\n");
+ printk("Bus error - the host /dev/shm or /tmp mount "
+ "likely just ran out of space\n");
panic("Kernel mode signal %d", sig);
}
- current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
+ current->thread.arch.faultinfo = *UPT_FAULTINFO(regs);
force_sig(sig, current);
}
-void bus_handler(int sig, union uml_pt_regs *regs)
+static void bus_handler(int sig, union uml_pt_regs *regs)
{
if(current->thread.fault_catcher != NULL)
do_longjmp(current->thread.fault_catcher, 1);
else relay_signal(sig, regs);
}
-void winch(int sig, union uml_pt_regs *regs)
+static void winch(int sig, union uml_pt_regs *regs)
{
do_IRQ(WINCH_IRQ, regs);
}
+const struct kern_handlers handlinfo_kern = {
+ .relay_signal = relay_signal,
+ .winch = winch,
+ .bus_handler = bus_handler,
+ .page_fault = segv_handler,
+ .sigio_handler = sigio_handler,
+ .timer_handler = timer_handler
+};
+
void trap_init(void)
{
}
projects / linux-drm-fsl-dcu.git / blobdiff