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https://github.com/ipxe/ipxe
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[gdb] Add support for x86_64
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
168
src/arch/x86_64/core/gdbidt.S
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168
src/arch/x86_64/core/gdbidt.S
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/*
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* Copyright (C) 2016 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** @file
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*
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* GDB exception handlers
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*
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*/
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/* Size of a register */
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#define SIZEOF_REG 8
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/* POSIX signal numbers for reporting traps to GDB */
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#define SIGILL 4
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#define SIGTRAP 5
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#define SIGFPE 8
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#define SIGSTKFLT 16
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.section ".text.gdbmach_interrupt", "ax", @progbits
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.code64
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.struct 0
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/* Register dump created for GDB stub */
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regs:
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regs_rax: .space SIZEOF_REG
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regs_rbx: .space SIZEOF_REG
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regs_rcx: .space SIZEOF_REG
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regs_rdx: .space SIZEOF_REG
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regs_rsi: .space SIZEOF_REG
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regs_rdi: .space SIZEOF_REG
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regs_rbp: .space SIZEOF_REG
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regs_rsp: .space SIZEOF_REG
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regs_r8: .space SIZEOF_REG
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regs_r9: .space SIZEOF_REG
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regs_r10: .space SIZEOF_REG
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regs_r11: .space SIZEOF_REG
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regs_r12: .space SIZEOF_REG
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regs_r13: .space SIZEOF_REG
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regs_r14: .space SIZEOF_REG
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regs_r15: .space SIZEOF_REG
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regs_rip: .space SIZEOF_REG
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regs_rflags: .space SIZEOF_REG
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regs_cs: .space SIZEOF_REG
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regs_ss: .space SIZEOF_REG
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regs_ds: .space SIZEOF_REG
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regs_es: .space SIZEOF_REG
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regs_fs: .space SIZEOF_REG
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regs_gs: .space SIZEOF_REG
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regs_end:
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/* GDB signal code */
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gdb:
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gdb_code: .space SIZEOF_REG
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gdb_end:
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/* Long-mode exception frame */
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frame:
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frame_rip: .space SIZEOF_REG
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frame_cs: .space SIZEOF_REG
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frame_rflags: .space SIZEOF_REG
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frame_rsp: .space SIZEOF_REG
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frame_ss: .space SIZEOF_REG
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frame_end:
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.previous
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.globl gdbmach_sigfpe
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gdbmach_sigfpe:
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push $SIGFPE
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jmp gdbmach_interrupt
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.globl gdbmach_sigtrap
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gdbmach_sigtrap:
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push $SIGTRAP
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jmp gdbmach_interrupt
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.globl gdbmach_sigstkflt
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gdbmach_sigstkflt:
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push $SIGSTKFLT
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jmp gdbmach_interrupt
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.globl gdbmach_sigill
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gdbmach_sigill:
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push $SIGILL
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jmp gdbmach_interrupt
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gdbmach_interrupt:
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/* Create register dump */
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pushq %gs
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pushq %fs
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pushq $0 /* %es unused in long mode */
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pushq $0 /* %ds unused in long mode */
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pushq ( frame_ss - regs_ss - SIZEOF_REG )(%rsp)
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pushq ( frame_cs - regs_cs - SIZEOF_REG )(%rsp)
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pushq ( frame_rflags - regs_rflags - SIZEOF_REG )(%rsp)
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pushq ( frame_rip - regs_rip - SIZEOF_REG )(%rsp)
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pushq %r15
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pushq %r14
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pushq %r13
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pushq %r12
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pushq %r11
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pushq %r10
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pushq %r9
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pushq %r8
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pushq ( frame_rsp - regs_rsp - SIZEOF_REG )(%rsp)
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pushq %rbp
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pushq %rdi
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pushq %rsi
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pushq %rdx
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pushq %rcx
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pushq %rbx
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pushq %rax
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/* Call GDB stub exception handler */
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movq gdb_code(%rsp), %rdi
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movq %rsp, %rsi
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call gdbmach_handler
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/* Restore from register dump */
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popq %rax
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popq %rbx
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popq %rcx
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popq %rdx
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popq %rsi
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popq %rdi
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popq %rbp
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popq ( frame_rsp - regs_rsp - SIZEOF_REG )(%rsp)
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popq %r8
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popq %r9
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popq %r10
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popq %r11
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popq %r12
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popq %r13
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popq %r14
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popq %r15
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popq ( frame_rip - regs_rip - SIZEOF_REG )(%rsp)
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popq ( frame_rflags - regs_rflags - SIZEOF_REG )(%rsp)
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popq ( frame_cs - regs_cs - SIZEOF_REG )(%rsp)
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popq ( frame_ss - regs_ss - SIZEOF_REG )(%rsp)
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addq $( regs_fs - regs_ds ), %rsp /* skip %ds, %es */
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popq %fs
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popq %gs
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/* Skip code */
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addq $( gdb_end - gdb_code ), %rsp /* skip code */
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/* Return */
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iretq
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@@ -14,16 +14,37 @@
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typedef unsigned long gdbreg_t;
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/* The register snapshot, this must be in sync with interrupt handler and the
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* GDB protocol. */
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/* Register snapshot */
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enum {
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// STUB: don't expect this to work!
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GDBMACH_EIP,
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GDBMACH_EFLAGS,
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GDBMACH_RAX,
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GDBMACH_RBX,
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GDBMACH_RCX,
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GDBMACH_RDX,
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GDBMACH_RSI,
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GDBMACH_RDI,
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GDBMACH_RBP,
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GDBMACH_RSP,
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GDBMACH_R8,
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GDBMACH_R9,
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GDBMACH_R10,
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GDBMACH_R11,
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GDBMACH_R12,
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GDBMACH_R13,
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GDBMACH_R14,
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GDBMACH_R15,
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GDBMACH_RIP,
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GDBMACH_RFLAGS,
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GDBMACH_CS,
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GDBMACH_SS,
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GDBMACH_DS,
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GDBMACH_ES,
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GDBMACH_FS,
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GDBMACH_GS,
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GDBMACH_NREGS,
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GDBMACH_SIZEOF_REGS = GDBMACH_NREGS * sizeof ( gdbreg_t )
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};
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#define GDBMACH_SIZEOF_REGS ( GDBMACH_NREGS * sizeof ( gdbreg_t ) )
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/* Breakpoint types */
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enum {
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GDBMACH_BPMEM,
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@@ -33,21 +54,27 @@ enum {
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GDBMACH_AWATCH,
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};
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/* Exception vectors */
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extern void gdbmach_sigfpe ( void );
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extern void gdbmach_sigtrap ( void );
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extern void gdbmach_sigstkflt ( void );
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extern void gdbmach_sigill ( void );
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static inline void gdbmach_set_pc ( gdbreg_t *regs, gdbreg_t pc ) {
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regs [ GDBMACH_EIP ] = pc;
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regs[GDBMACH_RIP] = pc;
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}
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static inline void gdbmach_set_single_step ( gdbreg_t *regs, int step ) {
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regs [ GDBMACH_EFLAGS ] &= ~( 1 << 8 ); /* Trace Flag (TF) */
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regs [ GDBMACH_EFLAGS ] |= ( step << 8 );
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regs[GDBMACH_RFLAGS] &= ~( 1 << 8 ); /* Trace Flag (TF) */
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regs[GDBMACH_RFLAGS] |= ( step << 8 );
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}
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static inline void gdbmach_breakpoint ( void ) {
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__asm__ __volatile__ ( "int $3\n" );
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}
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extern int gdbmach_set_breakpoint ( int type, unsigned long addr, size_t len, int enable );
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extern int gdbmach_set_breakpoint ( int type, unsigned long addr, size_t len,
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int enable );
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extern void gdbmach_init ( void );
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#endif /* GDBMACH_H */
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