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Runtime error
Runtime error
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#include "libcflat.h"
#include "isr.h"
#include "vm.h"
#include "desc.h"
extern char isr_entry_point[];
asm (
"isr_entry_point: \n"
#ifdef __x86_64__
"push %r15 \n\t"
"push %r14 \n\t"
"push %r13 \n\t"
"push %r12 \n\t"
"push %r11 \n\t"
"push %r10 \n\t"
"push %r9 \n\t"
"push %r8 \n\t"
#endif
"push %"R "di \n\t"
"push %"R "si \n\t"
"push %"R "bp \n\t"
"push %"R "sp \n\t"
"push %"R "bx \n\t"
"push %"R "dx \n\t"
"push %"R "cx \n\t"
"push %"R "ax \n\t"
#ifdef __x86_64__
"mov %rsp, %rdi \n\t"
"callq *8*16(%rsp) \n\t"
#else
"push %esp \n\t"
"calll *4+4*8(%esp) \n\t"
"add $4, %esp \n\t"
#endif
"pop %"R "ax \n\t"
"pop %"R "cx \n\t"
"pop %"R "dx \n\t"
"pop %"R "bx \n\t"
"pop %"R "bp \n\t"
"pop %"R "bp \n\t"
"pop %"R "si \n\t"
"pop %"R "di \n\t"
#ifdef __x86_64__
"pop %r8 \n\t"
"pop %r9 \n\t"
"pop %r10 \n\t"
"pop %r11 \n\t"
"pop %r12 \n\t"
"pop %r13 \n\t"
"pop %r14 \n\t"
"pop %r15 \n\t"
#endif
".globl isr_iret_ip\n\t"
#ifdef __x86_64__
"add $8, %rsp \n\t"
"isr_iret_ip: \n\t"
"iretq \n\t"
#else
"add $4, %esp \n\t"
"isr_iret_ip: \n\t"
"iretl \n\t"
#endif
);
void handle_irq(unsigned vec, void (*func)(isr_regs_t *regs))
{
u8 *thunk = vmalloc(50);
set_idt_entry(vec, thunk, 0);
#ifdef __x86_64__
/* sub $8, %rsp */
*thunk++ = 0x48; *thunk++ = 0x83; *thunk++ = 0xec; *thunk++ = 0x08;
/* mov $func_low, %(rsp) */
*thunk++ = 0xc7; *thunk++ = 0x04; *thunk++ = 0x24;
*(u32 *)thunk = (ulong)func; thunk += 4;
/* mov $func_high, %(rsp+4) */
*thunk++ = 0xc7; *thunk++ = 0x44; *thunk++ = 0x24; *thunk++ = 0x04;
*(u32 *)thunk = (ulong)func >> 32; thunk += 4;
/* jmp isr_entry_point */
*thunk ++ = 0xe9;
*(u32 *)thunk = (ulong)isr_entry_point - (ulong)(thunk + 4);
#else
/* push $func */
*thunk++ = 0x68;
*(u32 *)thunk = (ulong)func; thunk += 4;
/* jmp isr_entry_point */
*thunk++ = 0xe9;
*(u32 *)thunk = (ulong)isr_entry_point - (ulong)(thunk + 4);
#endif
}
void handle_external_interrupt(int vector)
{
idt_entry_t *idt = &boot_idt[vector];
unsigned long entry =
idt->offset0 | ((unsigned long)idt->offset1 << 16);
#ifdef __x86_64__
unsigned long tmp;
entry |= ((unsigned long)idt->offset2 << 32);
#endif
asm volatile(
#ifdef __x86_64__
"mov %%rsp, %[sp]\n\t"
"and $0xfffffffffffffff0, %%rsp\n\t"
"push $%c[ss]\n\t"
"push %[sp]\n\t"
#endif
"pushf\n\t"
"orl $0x200, (%%"R "sp)\n\t"
"push $%c[cs]\n\t"
"call *%[entry]\n\t"
:
#ifdef __x86_64__
[sp]"=&r"(tmp)
#endif
:
[entry]"r"(entry),
[ss]"i"(KERNEL_DS),
[cs]"i"(KERNEL_CS)
);
}
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