justin/jsix_import
1
0
Fork 0
Code Issues 1 Pull Requests Actions Packages Projects Releases Wiki Activity

Pass CPU state as a pointer

Browse Source 
Previously CPU statue was passed on the stack, but the compiler is
allowed to clobber values passed to it on the stack in the SysV x86 ABI.
So now leave the state on the stack but pass a pointer to it into the
ISR functions.
This commit is contained in:
Justin C. Miller
2019-02-07 17:47:42 -08:00
parent 79711be46a
commit 8c32471e0d
5 changed files with 39 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
src/kernel/interrupts.cpp
View File

@@ -18,8 +18,8 @@ static const uint16_t PIC2 = 0xa0;
extern "C" {
void _halt();
uintptr_t isr_handler(uintptr_t, cpu_state);
uintptr_t irq_handler(uintptr_t, cpu_state);
uintptr_t isr_handler(uintptr_t, cpu_state*);
uintptr_t irq_handler(uintptr_t, cpu_state*);
uintptr_t syscall_handler(uintptr_t, cpu_state);
#define ISR(i, name) extern void name ();
@@ -105,23 +105,23 @@ interrupts_init()
}
uintptr_t
isr_handler(uintptr_t return_rsp, cpu_state regs)
isr_handler(uintptr_t return_rsp, cpu_state *regs)
{
console *cons = console::get();
switch (static_cast<isr>(regs.interrupt & 0xff)) {
switch (static_cast<isr>(regs->interrupt & 0xff)) {
case isr::isrGPFault: {
cons->set_color(9);
cons->puts("\nGeneral Protection Fault:\n");
cons->set_color();
cons->printf(" errorcode: %lx", regs.errorcode);
if (regs.errorcode & 0x01) cons->puts(" external");
cons->printf(" errorcode: %lx", regs->errorcode);
if (regs->errorcode & 0x01) cons->puts(" external");
int index = (regs.errorcode & 0xffff) >> 4;
int index = (regs->errorcode & 0xffff) >> 4;
if (index) {
switch ((regs.errorcode & 0x07) >> 1) {
switch ((regs->errorcode & 0x07) >> 1) {
case 0:
cons->printf(" GDT[%x]\n", index);
gdt_dump();
@@ -140,10 +140,10 @@ isr_handler(uintptr_t return_rsp, cpu_state regs)
} else {
cons->putc('\n');
}
print_regs(regs);
print_regs(*regs);
/*
print_stacktrace(2);
print_stack(regs);
print_stack(*regs);
*/
}
@@ -156,19 +156,19 @@ isr_handler(uintptr_t return_rsp, cpu_state regs)
cons->set_color();
cons->puts(" flags:");
if (regs.errorcode & 0x01) cons->puts(" present");
if (regs.errorcode & 0x02) cons->puts(" write");
if (regs.errorcode & 0x04) cons->puts(" user");
if (regs.errorcode & 0x08) cons->puts(" reserved");
if (regs.errorcode & 0x10) cons->puts(" ip");
if (regs->errorcode & 0x01) cons->puts(" present");
if (regs->errorcode & 0x02) cons->puts(" write");
if (regs->errorcode & 0x04) cons->puts(" user");
if (regs->errorcode & 0x08) cons->puts(" reserved");
if (regs->errorcode & 0x10) cons->puts(" ip");
cons->puts("\n");
uint64_t cr2 = 0;
__asm__ __volatile__ ("mov %%cr2, %0" : "=r"(cr2));
print_reg("cr2", cr2);
print_reg("rsp", regs.user_rsp);
print_reg("rip", regs.rip);
print_reg("rsp", regs->user_rsp);
print_reg("rip", regs->rip);
cons->puts("\n");
print_stacktrace(2);
@@ -192,14 +192,14 @@ isr_handler(uintptr_t return_rsp, cpu_state regs)
case isr::isrAssert: {
cons->set_color();
print_regs(regs);
print_regs(*regs);
print_stacktrace(2);
}
_halt();
break;
case isr::isrSyscall: {
return_rsp = syscall_dispatch(return_rsp, regs);
return_rsp = syscall_dispatch(return_rsp, *regs);
}
break;
@@ -215,7 +215,7 @@ isr_handler(uintptr_t return_rsp, cpu_state regs)
case isr::isrIgnore5:
case isr::isrIgnore6:
case isr::isrIgnore7:
//cons->printf("\nIGNORED: %02x\n", regs.interrupt);
//cons->printf("\nIGNORED: %02x\n", regs->interrupt);
outb(PIC1, 0x20);
break;
@@ -227,7 +227,7 @@ isr_handler(uintptr_t return_rsp, cpu_state regs)
case isr::isrIgnoreD:
case isr::isrIgnoreE:
case isr::isrIgnoreF:
//cons->printf("\nIGNORED: %02x\n", regs.interrupt);
//cons->printf("\nIGNORED: %02x\n", regs->interrupt);
outb(PIC1, 0x20);
outb(PIC2, 0x20);
break;
@@ -235,13 +235,13 @@ isr_handler(uintptr_t return_rsp, cpu_state regs)
default:
cons->set_color(9);
cons->printf("\nReceived %02x interrupt:\n",
(static_cast<isr>(regs.interrupt)));
(static_cast<isr>(regs->interrupt)));
cons->set_color();
cons->printf(" ISR: %02lx ERR: %lx\n\n",
regs.interrupt, regs.errorcode);
regs->interrupt, regs->errorcode);
print_regs(regs);
print_regs(*regs);
//print_stacktrace(2);
_halt();
}
@@ -251,16 +251,16 @@ isr_handler(uintptr_t return_rsp, cpu_state regs)
}
uintptr_t
irq_handler(uintptr_t return_rsp, cpu_state regs)
irq_handler(uintptr_t return_rsp, cpu_state *regs)
{
console *cons = console::get();
uint8_t irq = get_irq(regs.interrupt);
uint8_t irq = get_irq(regs->interrupt);
if (! device_manager::get().dispatch_irq(irq)) {
cons->set_color(11);
cons->printf("\nReceived unknown IRQ: %d (vec %d)\n",
irq, regs.interrupt);
irq, regs->interrupt);
cons->set_color();
print_regs(regs);
print_regs(*regs);
_halt();
}