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https://github.com/SmallPond/MIT6.828_OS.git
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109 lines
3.3 KiB
ArmAsm
109 lines
3.3 KiB
ArmAsm
/* See COPYRIGHT for copyright information. */
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#include <inc/mmu.h>
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#include <inc/memlayout.h>
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#include <inc/trap.h>
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#include <kern/picirq.h>
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###################################################################
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# exceptions/interrupts
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###################################################################
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/* TRAPHANDLER defines a globally-visible function for handling a trap.
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* It pushes a trap number onto the stack, then jumps to _alltraps.
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* Use TRAPHANDLER for traps where the CPU automatically pushes an error code.
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*
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* You shouldn't call a TRAPHANDLER function from C, but you may
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* need to _declare_ one in C (for instance, to get a function pointer
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* during IDT setup). You can declare the function with
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* void NAME();
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* where NAME is the argument passed to TRAPHANDLER.
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*/
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#define TRAPHANDLER(name, num) \
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.globl name; /* define global symbol for 'name' */ \
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.type name, @function; /* symbol type is function */ \
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.align 2; /* align function definition */ \
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name: /* function starts here */ \
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pushl $(num); \
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jmp _alltraps
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/* Use TRAPHANDLER_NOEC for traps where the CPU doesn't push an error code.
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* It pushes a 0 in place of the error code, so the trap frame has the same
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* format in either case.
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* tarp handler no error code
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*/
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#define TRAPHANDLER_NOEC(name, num) \
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.globl name; \
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.type name, @function; \
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.align 2; \
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name: \
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pushl $0; \
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pushl $(num); \
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jmp _alltraps
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.text
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/*
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* 我们知道哪些trap是有错误代码的？ https://wiki.osdev.org/Exceptions
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* Lab 3: Your code here for generating entry points for the different traps.
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*/
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TRAPHANDLER_NOEC(divide_handler, T_DIVIDE);
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TRAPHANDLER_NOEC(debug_handler, T_DEBUG);
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TRAPHANDLER_NOEC(nmi_handler, T_NMI);
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TRAPHANDLER_NOEC(brkpt_handler, T_BRKPT);
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TRAPHANDLER_NOEC(oflow_handler, T_OFLOW);
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TRAPHANDLER_NOEC(bound_handler, T_BOUND);
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TRAPHANDLER_NOEC(illop_handler, T_ILLOP);
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TRAPHANDLER_NOEC(device_handler, T_DEVICE);
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TRAPHANDLER(dblflt_handler, T_DBLFLT);
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TRAPHANDLER(tss_handler, T_TSS);
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TRAPHANDLER(segnp_handler, T_SEGNP);
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TRAPHANDLER(stack_handler, T_STACK);
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TRAPHANDLER(gpflt_handler, T_GPFLT);
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TRAPHANDLER(pgflt_handler, T_PGFLT);
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TRAPHANDLER_NOEC(fperr_handler, T_FPERR);
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TRAPHANDLER(align_handler, T_ALIGN);
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TRAPHANDLER_NOEC(mchk_handler, T_MCHK);
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TRAPHANDLER_NOEC(simderr_handler, T_SIMDERR);
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TRAPHANDLER_NOEC(syscall_handler, T_SYSCALL);
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// IRQs
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TRAPHANDLER_NOEC(timer_handler, IRQ_OFFSET + IRQ_TIMER);
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TRAPHANDLER_NOEC(kbd_handler, IRQ_OFFSET + IRQ_KBD);
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TRAPHANDLER_NOEC(serial_handler, IRQ_OFFSET + IRQ_SERIAL);
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TRAPHANDLER_NOEC(spurious_handler, IRQ_OFFSET + IRQ_SPURIOUS);
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TRAPHANDLER_NOEC(ide_handler, IRQ_OFFSET + IRQ_IDE);
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TRAPHANDLER_NOEC(error_handler, IRQ_OFFSET + IRQ_ERROR);
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/*
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Your _alltraps should:
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1. push values to make the stack look like a struct Trapframe
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2. load GD_KD into %ds and %es
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3. pushl %esp to pass a pointer to the Trapframe as an argument to trap()
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4. call trap (can trap ever return?)
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*/
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/*
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* Lab 3: Your code here for _alltraps
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*what is padding ? 填充 pushl %ds;小端模式，是指数据的高字节保存在内存的高地址中
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*/
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.globl _alltraps
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_alltraps:
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pushl %ds;
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pushl %es;
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pushal;
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movw $GD_KD, %ax;
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movw %ax, %ds;
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movw %ax, %es;
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/*push esp, trap 能自己读esp, 我有点觉得是赋值*/
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pushl %esp;
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call trap
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