a73b93157f
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/*
|
|
* Copyright 2014 Google Inc.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <exception.h>
|
|
#include <gdb.h>
|
|
#include <libpayload.h>
|
|
|
|
struct gdb_regs
|
|
{
|
|
u32 r[16];
|
|
struct fp_reg
|
|
{
|
|
u8 byte[12];
|
|
} __attribute__((packed)) f[8];
|
|
u32 fps;
|
|
u32 cpsr;
|
|
} __attribute__((packed));
|
|
|
|
static const u8 type_to_signal[] = {
|
|
[EXC_UNDEF] = GDB_SIGILL,
|
|
[EXC_SWI] = GDB_SIGTRAP,
|
|
[EXC_PABORT] = GDB_SIGSEGV,
|
|
[EXC_DABORT] = GDB_SIGSEGV,
|
|
};
|
|
|
|
/* Scratch value to write reentrant exception states to. We never read it. */
|
|
static struct exception_state sentinel_exception_state;
|
|
|
|
static int gdb_exception_hook(u32 type)
|
|
{
|
|
/*
|
|
* If we were not resumed we are in deep trouble here. GDB probably told
|
|
* us to do something stupid and caused a reentrant exception. All we
|
|
* can do is just blindly send an error code and keep going. Eventually
|
|
* GDB will tell us to resume and we return right back to the original
|
|
* exception state ("jumping over" all the nested ones).
|
|
*/
|
|
if (gdb_state.connected && !gdb_state.resumed) {
|
|
static const char error_code[] = "E22"; /* EINVAL? */
|
|
static const struct gdb_message tmp_reply = {
|
|
.buf = (u8 *)error_code,
|
|
.used = sizeof(error_code),
|
|
.size = sizeof(error_code),
|
|
};
|
|
gdb_send_reply(&tmp_reply);
|
|
gdb_command_loop(gdb_state.signal); /* preserve old signal */
|
|
} else {
|
|
if (type >= ARRAY_SIZE(type_to_signal) || !type_to_signal[type])
|
|
return 0;
|
|
exception_state_ptr = &sentinel_exception_state;
|
|
gdb_command_loop(type_to_signal[type]);
|
|
}
|
|
|
|
exception_state_ptr = &exception_state;
|
|
return 1;
|
|
}
|
|
|
|
void gdb_arch_init(void)
|
|
{
|
|
exception_install_hook(&gdb_exception_hook);
|
|
}
|
|
|
|
void gdb_arch_enter(void)
|
|
{
|
|
u32 *sp;
|
|
|
|
asm volatile ("mov %0, %%sp" : "=r"(sp) );
|
|
|
|
/* Avoid reentrant exceptions, just call the hook if in one already. */
|
|
if (sp >= exception_stack && sp <= exception_stack_end)
|
|
gdb_exception_hook(EXC_SWI);
|
|
else
|
|
asm volatile ("svc #0");
|
|
}
|
|
|
|
int gdb_arch_set_single_step(int on)
|
|
{
|
|
/* GDB seems to only need this on x86, ARM works fine without it. */
|
|
return -1;
|
|
}
|
|
|
|
void gdb_arch_encode_regs(struct gdb_message *message)
|
|
{
|
|
gdb_message_encode_bytes(message, exception_state.regs,
|
|
sizeof(exception_state.regs));
|
|
gdb_message_encode_zero_bytes(message,
|
|
offsetof(struct gdb_regs, cpsr) - offsetof(struct gdb_regs, f));
|
|
gdb_message_encode_bytes(message, &exception_state.cpsr,
|
|
sizeof(exception_state.cpsr));
|
|
}
|
|
|
|
void gdb_arch_decode_regs(int offset, struct gdb_message *message)
|
|
{
|
|
const int cpsr_hex_offset = offsetof(struct gdb_regs, cpsr) * 2;
|
|
gdb_message_decode_bytes(message, offset,
|
|
exception_state.regs, sizeof(exception_state.regs));
|
|
gdb_message_decode_bytes(message, offset + cpsr_hex_offset,
|
|
&exception_state.cpsr, sizeof(exception_state.cpsr));
|
|
}
|