diff options
Diffstat (limited to 'gpxe/src/arch/i386/core/gdbidt.S')
| -rw-r--r-- | gpxe/src/arch/i386/core/gdbidt.S | 215 |
1 files changed, 0 insertions, 215 deletions
diff --git a/gpxe/src/arch/i386/core/gdbidt.S b/gpxe/src/arch/i386/core/gdbidt.S deleted file mode 100644 index cd8b38a9..00000000 --- a/gpxe/src/arch/i386/core/gdbidt.S +++ /dev/null @@ -1,215 +0,0 @@ -/* - * Interrupt Descriptor Table (IDT) setup and interrupt handlers for GDB stub. - */ - -#include <librm.h> - -#define SIZEOF_I386_REGS 32 -#define SIZEOF_I386_FLAGS 4 - -/**************************************************************************** - * Interrupt Descriptor Table - **************************************************************************** - */ - .section ".data16", "aw", @progbits - .globl idtr -idtr: -idt_limit: - .word idt_length - 1 -idt_base: - .long 0 - -/* IDT entries have the following format: - * offset_lo, segment selector, flags, offset_hi - * - * Since it is not possible to specify relocations in arbitrary - * expressions like (int_overflow & 0xffff), we initialise the - * IDT with entries in an incorrect format. - * - * The entries are shuffled into the correct format in init_librm(). - */ -#define IDT_ENTRY_EMPTY(name) .word 0, 0, 0, 0 -#define IDT_ENTRY_PRESENT(name) \ - .long int_##name; \ - .word 0x8e00, VIRTUAL_CS - -.align 16 -idt: - IDT_ENTRY_PRESENT(divide_error) - IDT_ENTRY_PRESENT(debug_trap) - IDT_ENTRY_EMPTY(non_maskable_interrupt) - IDT_ENTRY_PRESENT(breakpoint) - IDT_ENTRY_PRESENT(overflow) - IDT_ENTRY_PRESENT(bound_range_exceeded) - IDT_ENTRY_PRESENT(invalid_opcode) - IDT_ENTRY_EMPTY(device_not_available) - IDT_ENTRY_PRESENT(double_fault) - IDT_ENTRY_EMPTY(coprocessor_segment_overrun) - IDT_ENTRY_PRESENT(invalid_tss) - IDT_ENTRY_PRESENT(segment_not_present) - IDT_ENTRY_PRESENT(stack_segment_fault) - IDT_ENTRY_PRESENT(general_protection) - IDT_ENTRY_PRESENT(page_fault) -idt_end: - .equ idt_length, idt_end - idt - -/* The IDT entries are fixed up (once) in init_librm() */ -idt_fixed: - .byte 0 - -/**************************************************************************** - * idt_init (real-mode near call, 16-bit real-mode near return address) - * - * Initialise the IDT, called from init_librm. - * - * Parameters: - * %eax : IDT base address - * - * Destroys %ax, %bx, and %di. - **************************************************************************** - */ - .section ".text16", "ax", @progbits - .code16 - .globl idt_init -idt_init: - movl %eax, idt_base - addl $idt, idt_base - - /* IDT entries are only fixed up once */ - movb idt_fixed, %al - orb %al, %al - jnz 2f - movb $1, idt_fixed - - /* Shuffle IDT entries into the correct format */ - movb $(idt_length / 8), %al - movw $idt, %bx - or %al, %al - jz 2f -1: - movw 2(%bx), %di - xchg %di, 6(%bx) - movw %di, 2(%bx) - addw $8, %bx - dec %al - jnz 1b -2: - ret - -/**************************************************************************** - * Interrupt handlers - **************************************************************************** - */ - .section ".text", "ax", @progbits - .code32 - -/* POSIX signal numbers for reporting traps to GDB */ -#define SIGILL 4 -#define SIGTRAP 5 -#define SIGBUS 7 -#define SIGFPE 8 -#define SIGSEGV 11 -#define SIGSTKFLT 16 - -int_divide_error: - pushl $SIGFPE - jmp do_interrupt - -int_debug_trap: -int_breakpoint: - pushl $SIGTRAP - jmp do_interrupt - -int_overflow: -int_bound_range_exceeded: - pushl $SIGSTKFLT - jmp do_interrupt - -int_invalid_opcode: - pushl $SIGILL - jmp do_interrupt - -int_double_fault: - movl $SIGBUS, (%esp) - jmp do_interrupt - -int_invalid_tss: -int_segment_not_present: -int_stack_segment_fault: -int_general_protection: -int_page_fault: - movl $SIGSEGV, (%esp) - jmp do_interrupt - -/* When invoked, the stack contains: eflags, cs, eip, signo. */ -#define IH_OFFSET_GDB_REGS ( 0 ) -#define IH_OFFSET_GDB_EIP ( IH_OFFSET_GDB_REGS + SIZEOF_I386_REGS ) -#define IH_OFFSET_GDB_EFLAGS ( IH_OFFSET_GDB_EIP + 4 ) -#define IH_OFFSET_GDB_SEG_REGS ( IH_OFFSET_GDB_EFLAGS + SIZEOF_I386_FLAGS ) -#define IH_OFFSET_GDB_END ( IH_OFFSET_GDB_SEG_REGS + 6 * 4 ) -#define IH_OFFSET_SIGNO ( IH_OFFSET_GDB_END ) -#define IH_OFFSET_OLD_EIP ( IH_OFFSET_SIGNO + 4 ) -#define IH_OFFSET_OLD_CS ( IH_OFFSET_OLD_EIP + 4 ) -#define IH_OFFSET_OLD_EFLAGS ( IH_OFFSET_OLD_CS + 4 ) -#define IH_OFFSET_END ( IH_OFFSET_OLD_EFLAGS + 4 ) - -/* We also access the stack whilst still storing or restoring - * the register snapshot. Since ESP is in flux, we need - * special offsets. - */ -#define IH_OFFSET_FLUX_OLD_CS ( IH_OFFSET_OLD_CS - 44 ) -#define IH_OFFSET_FLUX_OLD_EFLAGS ( IH_OFFSET_OLD_EFLAGS - 40 ) -#define IH_OFFSET_FLUX_OLD_EIP ( IH_OFFSET_OLD_EIP - 36 ) -#define IH_OFFSET_FLUX_END ( IH_OFFSET_END - 20 ) -do_interrupt: - /* Store CPU state in GDB register snapshot */ - pushw $0 - pushw %gs - pushw $0 - pushw %fs - pushw $0 - pushw %es - pushw $0 - pushw %ds - pushw $0 - pushw %ss - pushw $0 - pushw IH_OFFSET_FLUX_OLD_CS + 2(%esp) - pushl IH_OFFSET_FLUX_OLD_EFLAGS(%esp) - pushl IH_OFFSET_FLUX_OLD_EIP(%esp) - pushl %edi - pushl %esi - pushl %ebp - leal IH_OFFSET_FLUX_END(%esp), %edi - pushl %edi /* old ESP */ - pushl %ebx - pushl %edx - pushl %ecx - pushl %eax - - /* Call GDB stub exception handler */ - pushl %esp - pushl (IH_OFFSET_SIGNO + 4)(%esp) - call gdbmach_handler - addl $8, %esp - - /* Restore CPU state from GDB register snapshot */ - popl %eax - popl %ecx - popl %edx - popl %ebx - addl $4, %esp /* Changing ESP currently not supported */ - popl %ebp - popl %esi - popl %edi - popl IH_OFFSET_FLUX_OLD_EIP(%esp) - popl IH_OFFSET_FLUX_OLD_EFLAGS(%esp) - popl IH_OFFSET_FLUX_OLD_CS(%esp) - popl %ss - popl %ds - popl %es - popl %fs - popl %gs - - addl $4, %esp /* drop signo */ - iret |