mirror of
https://github.com/ipxe/ipxe
synced 2026-01-13 09:29:04 +03:00
[gdb] Add support for x86_64
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
@@ -15,41 +15,29 @@
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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 SIGBUS 7
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#define SIGFPE 8
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#define SIGSEGV 11
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#define SIGSTKFLT 16
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.globl gdbmach_nocode_sigfpe
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gdbmach_nocode_sigfpe:
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.globl gdbmach_sigfpe
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gdbmach_sigfpe:
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pushl $SIGFPE
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jmp gdbmach_interrupt
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.globl gdbmach_nocode_sigtrap
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gdbmach_nocode_sigtrap:
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.globl gdbmach_sigtrap
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gdbmach_sigtrap:
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pushl $SIGTRAP
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jmp gdbmach_interrupt
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.globl gdbmach_nocode_sigstkflt
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gdbmach_nocode_sigstkflt:
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.globl gdbmach_sigstkflt
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gdbmach_sigstkflt:
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pushl $SIGSTKFLT
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jmp gdbmach_interrupt
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.globl gdbmach_nocode_sigill
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gdbmach_nocode_sigill:
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.globl gdbmach_sigill
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gdbmach_sigill:
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pushl $SIGILL
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jmp gdbmach_interrupt
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.globl gdbmach_withcode_sigbus
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gdbmach_withcode_sigbus:
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movl $SIGBUS, (%esp)
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jmp gdbmach_interrupt
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.globl gdbmach_withcode_sigsegv
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gdbmach_withcode_sigsegv:
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movl $SIGSEGV, (%esp)
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jmp gdbmach_interrupt
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/* When invoked, the stack contains: eflags, cs, eip, signo. */
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#define IH_OFFSET_GDB_REGS ( 0 )
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#define IH_OFFSET_GDB_EIP ( IH_OFFSET_GDB_REGS + SIZEOF_I386_REGS )
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@@ -1,184 +0,0 @@
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/*
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* Copyright (C) 2008 Stefan Hajnoczi <stefanha@gmail.com>.
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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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#include <stddef.h>
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#include <stdio.h>
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#include <assert.h>
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#include <ipxe/uaccess.h>
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#include <ipxe/gdbstub.h>
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#include <librm.h>
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#include <gdbmach.h>
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/** @file
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*
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* GDB architecture-specific bits for i386
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*
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*/
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enum {
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DR7_CLEAR = 0x00000400, /* disable hardware breakpoints */
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DR6_CLEAR = 0xffff0ff0, /* clear breakpoint status */
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};
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/** Hardware breakpoint, fields stored in x86 bit pattern form */
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struct hwbp {
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int type; /* type (1=write watchpoint, 3=access watchpoint) */
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unsigned long addr; /* linear address */
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size_t len; /* length (0=1-byte, 1=2-byte, 3=4-byte) */
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int enabled;
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};
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static struct hwbp hwbps [ 4 ];
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static gdbreg_t dr7 = DR7_CLEAR;
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static struct hwbp *gdbmach_find_hwbp ( int type, unsigned long addr, size_t len ) {
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struct hwbp *available = NULL;
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unsigned int i;
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for ( i = 0; i < sizeof hwbps / sizeof hwbps [ 0 ]; i++ ) {
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if ( hwbps [ i ].type == type && hwbps [ i ].addr == addr && hwbps [ i ].len == len ) {
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return &hwbps [ i ];
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}
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if ( !hwbps [ i ].enabled ) {
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available = &hwbps [ i ];
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}
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}
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return available;
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}
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static void gdbmach_commit_hwbp ( struct hwbp *bp ) {
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unsigned int regnum = bp - hwbps;
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/* Set breakpoint address */
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assert ( regnum < ( sizeof hwbps / sizeof hwbps [ 0 ] ) );
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switch ( regnum ) {
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case 0:
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__asm__ __volatile__ ( "movl %0, %%dr0\n" : : "r" ( bp->addr ) );
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break;
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case 1:
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__asm__ __volatile__ ( "movl %0, %%dr1\n" : : "r" ( bp->addr ) );
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break;
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case 2:
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__asm__ __volatile__ ( "movl %0, %%dr2\n" : : "r" ( bp->addr ) );
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break;
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case 3:
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__asm__ __volatile__ ( "movl %0, %%dr3\n" : : "r" ( bp->addr ) );
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break;
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}
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/* Set type */
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dr7 &= ~( 0x3 << ( 16 + 4 * regnum ) );
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dr7 |= bp->type << ( 16 + 4 * regnum );
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/* Set length */
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dr7 &= ~( 0x3 << ( 18 + 4 * regnum ) );
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dr7 |= bp->len << ( 18 + 4 * regnum );
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/* Set/clear local enable bit */
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dr7 &= ~( 0x3 << 2 * regnum );
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dr7 |= bp->enabled << 2 * regnum;
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}
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int gdbmach_set_breakpoint ( int type, unsigned long addr, size_t len, int enable ) {
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struct hwbp *bp;
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/* Check and convert breakpoint type to x86 type */
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switch ( type ) {
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case GDBMACH_WATCH:
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type = 0x1;
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break;
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case GDBMACH_AWATCH:
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type = 0x3;
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break;
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default:
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return 0; /* unsupported breakpoint type */
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}
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/* Only lengths 1, 2, and 4 are supported */
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if ( len != 2 && len != 4 ) {
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len = 1;
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}
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len--; /* convert to x86 breakpoint length bit pattern */
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/* Calculate linear address by adding segment base */
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addr += virt_offset;
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/* Set up the breakpoint */
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bp = gdbmach_find_hwbp ( type, addr, len );
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if ( !bp ) {
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return 0; /* ran out of hardware breakpoints */
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}
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bp->type = type;
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bp->addr = addr;
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bp->len = len;
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bp->enabled = enable;
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gdbmach_commit_hwbp ( bp );
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return 1;
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}
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static void gdbmach_disable_hwbps ( void ) {
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/* Store and clear hardware breakpoints */
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__asm__ __volatile__ ( "movl %0, %%dr7\n" : : "r" ( DR7_CLEAR ) );
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}
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static void gdbmach_enable_hwbps ( void ) {
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/* Clear breakpoint status register */
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__asm__ __volatile__ ( "movl %0, %%dr6\n" : : "r" ( DR6_CLEAR ) );
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/* Restore hardware breakpoints */
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__asm__ __volatile__ ( "movl %0, %%dr7\n" : : "r" ( dr7 ) );
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}
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__asmcall void gdbmach_handler ( int signo, gdbreg_t *regs ) {
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gdbmach_disable_hwbps();
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gdbstub_handler ( signo, regs );
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gdbmach_enable_hwbps();
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}
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static void * gdbmach_interrupt_vectors[] = {
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gdbmach_nocode_sigfpe, /* Divide by zero */
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gdbmach_nocode_sigtrap, /* Debug trap */
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NULL, /* Non-maskable interrupt */
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gdbmach_nocode_sigtrap, /* Breakpoint */
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gdbmach_nocode_sigstkflt, /* Overflow */
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gdbmach_nocode_sigstkflt, /* Bound range exceeded */
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gdbmach_nocode_sigill, /* Invalid opcode */
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NULL, /* Device not available */
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gdbmach_withcode_sigbus, /* Double fault */
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NULL, /* Coprocessor segment overrun */
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gdbmach_withcode_sigsegv, /* Invalid TSS */
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gdbmach_withcode_sigsegv, /* Segment not present */
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gdbmach_withcode_sigsegv, /* Stack segment fault */
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gdbmach_withcode_sigsegv, /* General protection fault */
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gdbmach_withcode_sigsegv, /* Page fault */
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};
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void gdbmach_init ( void ) {
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unsigned int i;
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for ( i = 0 ; i < ( sizeof ( gdbmach_interrupt_vectors ) /
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sizeof ( gdbmach_interrupt_vectors[0] ) ) ; i++ ) {
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set_interrupt_vector ( i, gdbmach_interrupt_vectors[i] );
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}
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}
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@@ -47,12 +47,10 @@ enum {
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};
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/* Interrupt vectors */
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extern void gdbmach_nocode_sigfpe ( void );
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extern void gdbmach_nocode_sigtrap ( void );
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extern void gdbmach_nocode_sigstkflt ( void );
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extern void gdbmach_nocode_sigill ( void );
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extern void gdbmach_withcode_sigbus ( void );
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extern void gdbmach_withcode_sigsegv ( void );
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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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