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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:29:51 +0000 |
commit | 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch) | |
tree | 32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/gdb/i386/idt.c | |
parent | Initial commit. (diff) | |
download | grub2-3e86199209a10ed6555e30b8b71884cb7cc45ed2.tar.xz grub2-3e86199209a10ed6555e30b8b71884cb7cc45ed2.zip |
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'grub-core/gdb/i386/idt.c')
-rw-r--r-- | grub-core/gdb/i386/idt.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/grub-core/gdb/i386/idt.c b/grub-core/gdb/i386/idt.c new file mode 100644 index 0000000..69bfcb0 --- /dev/null +++ b/grub-core/gdb/i386/idt.c @@ -0,0 +1,78 @@ +/* idt.c - routines for constructing IDT fot the GDB stub */ +/* + * Copyright (C) 2006 Lubomir Kundrak + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <grub/machine/memory.h> +#include <grub/misc.h> +#include <grub/cpu/gdb.h> +#include <grub/gdb.h> + +static struct grub_cpu_interrupt_gate grub_gdb_idt[GRUB_GDB_LAST_TRAP + 1] + __attribute__ ((aligned(16))); + +/* Sets up a gate descriptor in the IDT table. */ +static void +grub_idt_gate (struct grub_cpu_interrupt_gate *gate, void (*offset) (void), + grub_uint16_t selector, grub_uint8_t type, grub_uint8_t dpl) +{ + gate->offset_lo = (int) offset & 0xffff; + gate->selector = selector & 0xffff; + gate->unused = 0; + gate->gate = (type & 0x1f) | ((dpl & 0x3) << 5) | 0x80; + gate->offset_hi = ((int) offset >> 16) & 0xffff; +} + +static struct grub_cpu_idt_descriptor grub_gdb_orig_idt_desc + __attribute__ ((aligned(16))); +static struct grub_cpu_idt_descriptor grub_gdb_idt_desc + __attribute__ ((aligned(16))); + +/* Set up interrupt and trap handler descriptors in IDT. */ +void +grub_gdb_idtinit (void) +{ + int i; + grub_uint16_t seg; + + asm volatile ("xorl %%eax, %%eax\n" + "mov %%cs, %%ax\n" :"=a" (seg)); + + for (i = 0; i <= GRUB_GDB_LAST_TRAP; i++) + { + grub_idt_gate (&grub_gdb_idt[i], + grub_gdb_trapvec[i], seg, + GRUB_CPU_TRAP_GATE, 0); + } + + grub_gdb_idt_desc.base = (grub_addr_t) grub_gdb_idt; + grub_gdb_idt_desc.limit = sizeof (grub_gdb_idt) - 1; + asm volatile ("sidt %0" : : "m" (grub_gdb_orig_idt_desc)); + asm volatile ("lidt %0" : : "m" (grub_gdb_idt_desc)); +} + +void +grub_gdb_idtrestore (void) +{ + asm volatile ("lidt %0" : : "m" (grub_gdb_orig_idt_desc)); +} + +void +grub_gdb_breakpoint (void) +{ + asm volatile ("int $3"); +} |