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Add page fault debug messages

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pjht 2019-02-10 15:04:54 -06:00
parent a12c1281ff
commit 205950e974
1 changed files with 22 additions and 18 deletions
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40
cpu/i386/isr.c
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@ -122,24 +122,28 @@ void isr_handler(registers_t r) {
case 14: {
uint32_t addr;
asm("movl %%cr2,%0": "=r"(addr));
vga_write_string("FAULT\n");
// if (r.err_code==0) {
// klog("PANIC","Kernel process tried to read a non-present page entry at address %x",addr);
// } else if (r.err_code==1) {
// klog("PANIC","Kernel process tried to read a page and caused a protection fault at address %x",addr);
// } else if (r.err_code==2) {
// klog("PANIC","Kernel process tried to write to a non-present page entry at address %x",addr);
// } else if (r.err_code==3) {
// klog("PANIC","Kernel process tried to write a page and caused a protection fault at address %x",addr);
// } else if (r.err_code==4) {
// klog("PANIC","User process tried to read a non-present page entry at address %x",addr);
// } else if (r.err_code==5) {
// klog("PANIC","User process tried to read a page and caused a protection fault at address %x",addr);
// } else if (r.err_code==6) {
// klog("PANIC","User process tried to write to a non-present page entry at address %x",addr);
// } else if (r.err_code==7) {
// klog("PANIC","User process tried to write a page and caused a protection fault at address %x",addr);
// }
if (r.err_code==0) {
vga_write_string("Kernel process tried to read a non-present page entry at address ");
} else if (r.err_code==1) {
vga_write_string("Kernel process tried to read a page and caused a protection fault at address ");
} else if (r.err_code==2) {
vga_write_string("Kernel process tried to write to a non-present page entry at address ");
} else if (r.err_code==3) {
vga_write_string("Kernel process tried to write a page and caused a protection fault at address ");
} else if (r.err_code==4) {
vga_write_string("User process tried to read a non-present page entry at address ");
} else if (r.err_code==5) {
vga_write_string("User process tried to read a page and caused a protection fault at address ");
} else if (r.err_code==6) {
vga_write_string("User process tried to write to a non-present page entry at address ");
} else if (r.err_code==7) {
vga_write_string("User process tried to write a page and caused a protection fault at address ");
}
char str[11];
str[0]='\0';
hex_to_ascii(addr,str);
vga_write_string(str);
vga_write_string("\n");
// if ((r.err_code&1)==0) {
// // int dir_entry=(addr&0xFFC00000)>>22;
// // int table_entry=(addr&0x3FF000)>12;