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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300

Browse Source 
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300:
  MN10300: gcc 4.6 vs am33 inline assembly
  MN10300: Deprecate gdbstub
  MN10300: Allow KGDB to use the MN10300 serial ports
  MN10300: Emulate single stepping in KGDB on MN10300
  MN10300: Generalise kernel debugger kernel halt, reboot or power off hook
  KGDB: Notify GDB of machine halt, reboot or power off
  MN10300: Use KGDB
  MN10300: Create generic kernel debugger hooks
  MN10300: Create general kernel debugger cache flushing
  MN10300: Introduce a general config option for kernel debugger hooks
  MN10300: The icache invalidate functions should disable the icache first
  MN10300: gdbstub: Restrict single-stepping to non-preemptable non-SMP configs
This commit is contained in:
Linus Torvalds
2011-03-24 10:07:50 -07:00
parent 6d1e9a42e7 5a4b65ab50
commit 3dab04e697
39 changed files with 1919 additions and 497 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/mn10300/Kconfig
+6 -4
View File
@@ -3,6 +3,8 @@ config MN10300
select HAVE_OPROFILE
select HAVE_GENERIC_HARDIRQS
select GENERIC_HARDIRQS_NO_DEPRECATED
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_KGDB
config AM33_2
def_bool n
@@ -401,9 +403,9 @@ comment "[!] NOTE: A lower number/level indicates a higher priority (0 is highes
comment "____Non-maskable interrupt levels____"
comment "The following must be set to a higher priority than local_irq_disable() and on-chip serial"
config GDBSTUB_IRQ_LEVEL
int "GDBSTUB interrupt priority"
depends on GDBSTUB
config DEBUGGER_IRQ_LEVEL
int "DEBUGGER interrupt priority"
depends on KERNEL_DEBUGGER
range 0 1 if LINUX_CLI_LEVEL = 2
range 0 2 if LINUX_CLI_LEVEL = 3
range 0 3 if LINUX_CLI_LEVEL = 4
@@ -437,7 +439,7 @@ config LINUX_CLI_LEVEL
EPSW.IM from 7. Any interrupt is permitted for which the level is
lower than EPSW.IM.
Certain interrupts, such as GDBSTUB and virtual MN10300 on-chip
Certain interrupts, such as DEBUGGER and virtual MN10300 on-chip
serial DMA interrupts are allowed to interrupt normal disabled
sections.
arch/mn10300/Kconfig.debug
+16 -1
View File
@@ -36,7 +36,7 @@ config KPROBES
config GDBSTUB
bool "Remote GDB kernel debugging"
depends on DEBUG_KERNEL
depends on DEBUG_KERNEL && DEPRECATED
select DEBUG_INFO
select FRAME_POINTER
help
@@ -46,6 +46,9 @@ config GDBSTUB
RAM to avoid excessive linking time. This is only useful for kernel
hackers. If unsure, say N.
This is deprecated in favour of KGDB and will be removed in a later
version.
config GDBSTUB_IMMEDIATE
bool "Break into GDB stub immediately"
depends on GDBSTUB
@@ -54,6 +57,14 @@ config GDBSTUB_IMMEDIATE
possible, leaving the program counter at the beginning of
start_kernel() in init/main.c.
config GDBSTUB_ALLOW_SINGLE_STEP
bool "Allow software single-stepping in GDB stub"
depends on GDBSTUB && !SMP && !PREEMPT
help
Allow GDB stub to perform software single-stepping through the
kernel. This doesn't work very well on SMP or preemptible kernels as
it uses temporary breakpoints to emulate single-stepping.
config GDB_CONSOLE
bool "Console output to GDB"
depends on GDBSTUB
@@ -142,3 +153,7 @@ config GDBSTUB_ON_TTYSx
default y
endmenu
config KERNEL_DEBUGGER
def_bool y
depends on GDBSTUB || KGDB
arch/mn10300/include/asm/debugger.h
+43
View File
@@ -0,0 +1,43 @@
/* Kernel debugger for MN10300
*
* Copyright (C) 2011 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#ifndef _ASM_DEBUGGER_H
#define _ASM_DEBUGGER_H
#if defined(CONFIG_KERNEL_DEBUGGER)
extern int debugger_intercept(enum exception_code, int, int, struct pt_regs *);
extern int at_debugger_breakpoint(struct pt_regs *);
#ifndef CONFIG_MN10300_DEBUGGER_CACHE_NO_FLUSH
extern void debugger_local_cache_flushinv(void);
extern void debugger_local_cache_flushinv_one(u8 *);
#else
static inline void debugger_local_cache_flushinv(void) {}
static inline void debugger_local_cache_flushinv_one(u8 *addr) {}
#endif
#else /* CONFIG_KERNEL_DEBUGGER */
static inline int debugger_intercept(enum exception_code excep,
int signo, int si_code,
struct pt_regs *regs)
{
return 0;
}
static inline int at_debugger_breakpoint(struct pt_regs *regs)
{
return 0;
}
#endif /* CONFIG_KERNEL_DEBUGGER */
#endif /* _ASM_DEBUGGER_H */
arch/mn10300/include/asm/div64.h
+17 -4
View File
@@ -15,6 +15,19 @@
extern void ____unhandled_size_in_do_div___(void);
/*
* Beginning with gcc 4.6, the MDR register is represented explicitly. We
* must, therefore, at least explicitly clobber the register when we make
* changes to it. The following assembly fragments *could* be rearranged in
* order to leave the moves to/from the MDR register to the compiler, but the
* gains would be minimal at best.
*/
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
# define CLOBBER_MDR_CC "mdr", "cc"
#else
# define CLOBBER_MDR_CC "cc"
#endif
/*
* divide n by base, leaving the result in n and returning the remainder
* - we can do this quite efficiently on the MN10300 by cascading the divides
@@ -29,7 +42,7 @@ extern void ____unhandled_size_in_do_div___(void);
"mov mdr,%1 \n" \
: "+r"(n), "=d"(__rem) \
: "r"(base), "1"(__rem) \
: "cc" \
: CLOBBER_MDR_CC \
); \
} else if (sizeof(n) <= 8) { \
union { \
@@ -48,7 +61,7 @@ extern void ____unhandled_size_in_do_div___(void);
: "=d"(__rem), "=r"(__quot.w[1]), "=r"(__quot.w[0]) \
: "r"(base), "0"(__rem), "1"(__quot.w[1]), \
"2"(__quot.w[0]) \
: "cc" \
: CLOBBER_MDR_CC \
); \
n = __quot.l; \
} else { \
@@ -72,7 +85,7 @@ unsigned __muldiv64u(unsigned val, unsigned mult, unsigned div)
* MDR = MDR:val%div */
: "=r"(result)
: "0"(val), "ir"(mult), "r"(div)
: "cc"
: CLOBBER_MDR_CC
);
return result;
@@ -93,7 +106,7 @@ signed __muldiv64s(signed val, signed mult, signed div)
* MDR = MDR:val%div */
: "=r"(result)
: "0"(val), "ir"(mult), "r"(div)
: "cc"
: CLOBBER_MDR_CC
);
return result;
arch/mn10300/include/asm/fpu.h
-2
View File
@@ -55,7 +55,6 @@ static inline void clear_using_fpu(struct task_struct *tsk)
extern asmlinkage void fpu_kill_state(struct task_struct *);
extern asmlinkage void fpu_exception(struct pt_regs *, enum exception_code);
extern asmlinkage void fpu_invalid_op(struct pt_regs *, enum exception_code);
extern asmlinkage void fpu_init_state(void);
extern asmlinkage void fpu_save(struct fpu_state_struct *);
extern int fpu_setup_sigcontext(struct fpucontext *buf);
@@ -113,7 +112,6 @@ static inline void flush_fpu(void)
extern asmlinkage
void unexpected_fpu_exception(struct pt_regs *, enum exception_code);
#define fpu_invalid_op unexpected_fpu_exception
#define fpu_exception unexpected_fpu_exception
struct task_struct;
arch/mn10300/include/asm/irqflags.h
+1 -1
View File
@@ -20,7 +20,7 @@
/*
* interrupt control
* - "disabled": run in IM1/2
* - level 0 - GDB stub
* - level 0 - kernel debugger
* - level 1 - virtual serial DMA (if present)
* - level 5 - normal interrupt priority
* - level 6 - timer interrupt
arch/mn10300/include/asm/kgdb.h
+81
View File
@@ -0,0 +1,81 @@
/* Kernel debugger for MN10300
*
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#ifndef _ASM_KGDB_H
#define _ASM_KGDB_H
/*
* BUFMAX defines the maximum number of characters in inbound/outbound
* buffers at least NUMREGBYTES*2 are needed for register packets
* Longer buffer is needed to list all threads
*/
#define BUFMAX 1024
/*
* Note that this register image is in a different order than the register
* image that Linux produces at interrupt time.
*/
enum regnames {
GDB_FR_D0 = 0,
GDB_FR_D1 = 1,
GDB_FR_D2 = 2,
GDB_FR_D3 = 3,
GDB_FR_A0 = 4,
GDB_FR_A1 = 5,
GDB_FR_A2 = 6,
GDB_FR_A3 = 7,
GDB_FR_SP = 8,
GDB_FR_PC = 9,
GDB_FR_MDR = 10,
GDB_FR_EPSW = 11,
GDB_FR_LIR = 12,
GDB_FR_LAR = 13,
GDB_FR_MDRQ = 14,
GDB_FR_E0 = 15,
GDB_FR_E1 = 16,
GDB_FR_E2 = 17,
GDB_FR_E3 = 18,
GDB_FR_E4 = 19,
GDB_FR_E5 = 20,
GDB_FR_E6 = 21,
GDB_FR_E7 = 22,
GDB_FR_SSP = 23,
GDB_FR_MSP = 24,
GDB_FR_USP = 25,
GDB_FR_MCRH = 26,
GDB_FR_MCRL = 27,
GDB_FR_MCVF = 28,
GDB_FR_FPCR = 29,
GDB_FR_DUMMY0 = 30,
GDB_FR_DUMMY1 = 31,
GDB_FR_FS0 = 32,
GDB_FR_SIZE = 64,
};
#define GDB_ORIG_D0 41
#define NUMREGBYTES (GDB_FR_SIZE*4)
static inline void arch_kgdb_breakpoint(void)
{
asm(".globl __arch_kgdb_breakpoint; __arch_kgdb_breakpoint: break");
}
extern u8 __arch_kgdb_breakpoint;
#define BREAK_INSTR_SIZE 1
#define CACHE_FLUSH_IS_SAFE 1
#endif /* _ASM_KGDB_H */
arch/mn10300/include/asm/smp.h
+4 -2
View File
@@ -34,7 +34,7 @@
#define LOCAL_TIMER_IPI 193
#define FLUSH_CACHE_IPI 194
#define CALL_FUNCTION_NMI_IPI 195
#define GDB_NMI_IPI 196
#define DEBUGGER_NMI_IPI 196
#define SMP_BOOT_IRQ 195
@@ -43,6 +43,7 @@
#define LOCAL_TIMER_GxICR_LV GxICR_LEVEL_4
#define FLUSH_CACHE_GxICR_LV GxICR_LEVEL_0
#define SMP_BOOT_GxICR_LV GxICR_LEVEL_0
#define DEBUGGER_GxICR_LV CONFIG_DEBUGGER_IRQ_LEVEL
#define TIME_OUT_COUNT_BOOT_IPI 100
#define DELAY_TIME_BOOT_IPI 75000
@@ -61,8 +62,9 @@
* An alternate way of dealing with this could be to use the EPSW.S bits to
* cache this information for systems with up to four CPUs.
*/
#define arch_smp_processor_id() (CPUID)
#if 0
#define raw_smp_processor_id() (CPUID)
#define raw_smp_processor_id() (arch_smp_processor_id())
#else
#define raw_smp_processor_id() (current_thread_info()->cpu)
#endif
arch/mn10300/include/asm/thread_info.h
+4
View File
@@ -131,7 +131,11 @@ static inline unsigned long current_stack_pointer(void)
kmalloc_node(THREAD_SIZE, GFP_KERNEL, node)
#endif
#ifndef CONFIG_KGDB
#define free_thread_info(ti) kfree((ti))
#else
extern void free_thread_info(struct thread_info *);
#endif
#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)
arch/mn10300/kernel/Makefile
+1 -4
View File
@@ -21,11 +21,8 @@ obj-$(CONFIG_GDBSTUB) += gdb-stub.o gdb-low.o
obj-$(CONFIG_GDBSTUB_ON_TTYSx) += gdb-io-serial.o gdb-io-serial-low.o
obj-$(CONFIG_GDBSTUB_ON_TTYSMx) += gdb-io-ttysm.o gdb-io-ttysm-low.o
ifeq ($(CONFIG_MN10300_CACHE_ENABLED),y)
obj-$(CONFIG_GDBSTUB) += gdb-cache.o
endif
obj-$(CONFIG_MN10300_RTC) += rtc.o
obj-$(CONFIG_PROFILE) += profile.o profile-low.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_KGDB) += kgdb.o
arch/mn10300/kernel/entry.S
+24 -41
View File
@@ -266,7 +266,11 @@ ENTRY(raw_bus_error)
###############################################################################
#
# Miscellaneous exception entry points
# NMI exception entry points
#
# This is used by ordinary interrupt channels that have the GxICR_NMI bit set
# in addition to the main NMI and Watchdog channels. SMP NMI IPIs use this
# facility.
#
###############################################################################
ENTRY(nmi_handler)
@@ -281,7 +285,7 @@ ENTRY(nmi_handler)
and NMIAGR_GN,d0
lsr 0x2,d0
cmp CALL_FUNCTION_NMI_IPI,d0
bne 5f # if not call function, jump
bne nmi_not_smp_callfunc # if not call function, jump
# function call nmi ipi
add 4,sp # no need to store TBR
@@ -295,59 +299,38 @@ ENTRY(nmi_handler)
call smp_nmi_call_function_interrupt[],0
RESTORE_ALL
5:
#ifdef CONFIG_GDBSTUB
cmp GDB_NMI_IPI,d0
bne 3f # if not gdb nmi ipi, jump
nmi_not_smp_callfunc:
#ifdef CONFIG_KERNEL_DEBUGGER
cmp DEBUGGER_NMI_IPI,d0
bne nmi_not_debugger # if not kernel debugger NMI IPI, jump
# gdb nmi ipi
# kernel debugger NMI IPI
add 4,sp # no need to store TBR
mov GxICR_DETECT,d0 # clear NMI
movbu d0,(GxICR(GDB_NMI_IPI))
movhu (GxICR(GDB_NMI_IPI)),d0
movbu d0,(GxICR(DEBUGGER_NMI_IPI))
movhu (GxICR(DEBUGGER_NMI_IPI)),d0
and ~EPSW_NMID,epsw # enable NMI
#ifdef CONFIG_MN10300_CACHE_ENABLED
mov (gdbstub_nmi_opr_type),d0
cmp GDBSTUB_NMI_CACHE_PURGE,d0
bne 4f # if not gdb cache purge, jump
# gdb cache purge nmi ipi
add -20,sp
mov d1,(4,sp)
mov a0,(8,sp)
mov a1,(12,sp)
mov mdr,d0
mov d0,(16,sp)
call gdbstub_local_purge_cache[],0
mov 0x1,d0
mov (CPUID),d1
asl d1,d0
mov gdbstub_nmi_cpumask,a0
bclr d0,(a0)
mov (4,sp),d1
mov (8,sp),a0
mov (12,sp),a1
mov (16,sp),d0
mov d0,mdr
add 20,sp
mov (sp),d0
add 4,sp
rti
4:
#endif /* CONFIG_MN10300_CACHE_ENABLED */
# gdb wait nmi ipi
mov (sp),d0
SAVE_ALL
call gdbstub_nmi_wait[],0
mov fp,d0 # arg 0: stacked register file
mov a2,d1 # arg 1: exception number
call debugger_nmi_interrupt[],0
RESTORE_ALL
3:
#endif /* CONFIG_GDBSTUB */
nmi_not_debugger:
#endif /* CONFIG_KERNEL_DEBUGGER */
mov (sp),d0 # restore TBR to d0
add 4,sp
#endif /* CONFIG_SMP */
bra __common_exception_nonmi
###############################################################################
#
# General exception entry point
#
###############################################################################
ENTRY(__common_exception)
add -4,sp
mov d0,(sp)
arch/mn10300/kernel/fpu.c
-18
View File
@@ -69,24 +69,6 @@ asmlinkage void fpu_exception(struct pt_regs *regs, enum exception_code code)
force_sig_info(SIGFPE, &info, tsk);
}
/*
* handle an FPU invalid_op exception
* - Derived from DO_EINFO() macro in arch/mn10300/kernel/traps.c
*/
asmlinkage void fpu_invalid_op(struct pt_regs *regs, enum exception_code code)
{
siginfo_t info;
if (!user_mode(regs))
die_if_no_fixup("FPU invalid opcode", regs, code);
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_COPROC;
info.si_addr = (void *) regs->pc;
force_sig_info(info.si_signo, &info, current);
}
/*
* save the FPU state to a signal context
*/
arch/mn10300/kernel/gdb-cache.S
-105
View File
@@ -1,105 +0,0 @@
###############################################################################
#
# MN10300 Low-level cache purging routines for gdbstub
#
# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licence
# as published by the Free Software Foundation; either version
# 2 of the Licence, or (at your option) any later version.
#
###############################################################################
#include <linux/sys.h>
#include <linux/linkage.h>
#include <asm/smp.h>
#include <asm/cache.h>
#include <asm/cpu-regs.h>
#include <asm/exceptions.h>
#include <asm/frame.inc>
#include <asm/serial-regs.h>
.text
###############################################################################
#
# GDB stub cache purge
#
###############################################################################
.type gdbstub_purge_cache,@function
ENTRY(gdbstub_purge_cache)
#######################################################################
# read the addresses tagged in the cache's tag RAM and attempt to flush
# those addresses specifically
# - we rely on the hardware to filter out invalid tag entry addresses
mov DCACHE_TAG(0,0),a0 # dcache tag RAM access address
mov DCACHE_PURGE(0,0),a1 # dcache purge request address
mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of entries
mn10300_dcache_flush_loop:
mov (a0),d0
and L1_CACHE_TAG_ADDRESS|L1_CACHE_TAG_ENTRY,d0
or L1_CACHE_TAG_VALID,d0 # retain valid entries in the
# cache
mov d0,(a1) # conditional purge
mn10300_dcache_flush_skip:
add L1_CACHE_BYTES,a0
add L1_CACHE_BYTES,a1
add -1,d1
bne mn10300_dcache_flush_loop
;; # unconditionally flush and invalidate the dcache
;; mov DCACHE_PURGE(0,0),a1 # dcache purge request address
;; mov L1_CACHE_NWAYS*L1_CACHE_NENTRIES,d1 # total number of
;; # entries
;;
;; gdbstub_purge_cache__dcache_loop:
;; mov (a1),d0 # unconditional purge
;;
;; add L1_CACHE_BYTES,a1
;; add -1,d1
;; bne gdbstub_purge_cache__dcache_loop
#######################################################################
# now invalidate the icache
mov CHCTR,a0
movhu (a0),a1
mov epsw,d1
and ~EPSW_IE,epsw
nop
nop
# disable the icache
and ~CHCTR_ICEN,d0
movhu d0,(a0)
# and wait for it to calm down
setlb
movhu (a0),d0
btst CHCTR_ICBUSY,d0
lne
# invalidate
or CHCTR_ICINV,d0
movhu d0,(a0)
# wait for the cache to finish
mov CHCTR,a0
setlb
movhu (a0),d0
btst CHCTR_ICBUSY,d0
lne
# and reenable it
movhu a1,(a0)
movhu (a0),d0 # read back to flush
# (SIGILLs all over without this)
mov d1,epsw
ret [],0
.size gdbstub_purge_cache,.-gdbstub_purge_cache
arch/mn10300/kernel/gdb-io-ttysm.c
+4 -4
View File
@@ -59,10 +59,10 @@ void __init gdbstub_io_init(void)
/* we want to get serial receive interrupts */
set_intr_level(gdbstub_port->rx_irq,
NUM2GxICR_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL));
NUM2GxICR_LEVEL(CONFIG_DEBUGGER_IRQ_LEVEL));
set_intr_level(gdbstub_port->tx_irq,
NUM2GxICR_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL));
set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_GDBSTUB_IRQ_LEVEL),
NUM2GxICR_LEVEL(CONFIG_DEBUGGER_IRQ_LEVEL));
set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_DEBUGGER_IRQ_LEVEL),
gdbstub_io_rx_handler);
*gdbstub_port->rx_icr |= GxICR_ENABLE;
@@ -88,7 +88,7 @@ void __init gdbstub_io_init(void)
/* permit level 0 IRQs only */
arch_local_change_intr_mask_level(
NUM2EPSW_IM(CONFIG_GDBSTUB_IRQ_LEVEL + 1));
NUM2EPSW_IM(CONFIG_DEBUGGER_IRQ_LEVEL + 1));
}
/*
arch/mn10300/kernel/gdb-stub.c
+29 -12
View File
@@ -133,7 +133,7 @@
#include <asm/system.h>
#include <asm/gdb-stub.h>
#include <asm/exceptions.h>
#include <asm/cacheflush.h>
#include <asm/debugger.h>
#include <asm/serial-regs.h>
#include <asm/busctl-regs.h>
#include <unit/leds.h>
@@ -405,6 +405,7 @@ static int hexToInt(char **ptr, int *intValue)
return (numChars);
}
#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
/*
* We single-step by setting breakpoints. When an exception
* is handled, we need to restore the instructions hoisted
@@ -729,6 +730,7 @@ static int gdbstub_single_step(struct pt_regs *regs)
__gdbstub_restore_bp();
return -EFAULT;
}
#endif /* CONFIG_GDBSTUB_ALLOW_SINGLE_STEP */
#ifdef CONFIG_GDBSTUB_CONSOLE
@@ -1171,7 +1173,7 @@ int gdbstub_clear_breakpoint(u8 *addr, int len)
/*
* This function does all command processing for interfacing to gdb
* - returns 1 if the exception should be skipped, 0 otherwise.
* - returns 0 if the exception should be skipped, -ERROR otherwise.
*/
static int gdbstub(struct pt_regs *regs, enum exception_code excep)
{
@@ -1186,7 +1188,7 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
int loop;
if (excep == EXCEP_FPU_DISABLED)
return 0;
return -ENOTSUPP;
gdbstub_flush_caches = 0;
@@ -1195,7 +1197,7 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
asm volatile("mov mdr,%0" : "=d"(mdr));
local_save_flags(epsw);
arch_local_change_intr_mask_level(
NUM2EPSW_IM(CONFIG_GDBSTUB_IRQ_LEVEL + 1));
NUM2EPSW_IM(CONFIG_DEBUGGER_IRQ_LEVEL + 1));
gdbstub_store_fpu();
@@ -1208,11 +1210,13 @@ static int gdbstub(struct pt_regs *regs, enum exception_code excep)
/* if we were single stepping, restore the opcodes hoisted for the
* breakpoint[s] */
broke = 0;
#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
if ((step_bp[0].addr && step_bp[0].addr == (u8 *) regs->pc) ||
(step_bp[1].addr && step_bp[1].addr == (u8 *) regs->pc))
broke = 1;
__gdbstub_restore_bp();
#endif
if (gdbstub_rx_unget) {
sigval = SIGINT;
@@ -1548,17 +1552,21 @@ packet_waiting:
* Step to next instruction
*/
case 's':
/*
* using the T flag doesn't seem to perform single
/* Using the T flag doesn't seem to perform single
* stepping (it seems to wind up being caught by the
* JTAG unit), so we have to use breakpoints and
* continue instead.
*/
#ifdef CONFIG_GDBSTUB_ALLOW_SINGLE_STEP
if (gdbstub_single_step(regs) < 0)
/* ignore any fault error for now */
gdbstub_printk("unable to set single-step"
" bp\n");
goto done;
#else
gdbstub_strcpy(output_buffer, "E01");
break;
#endif
/*
* Set baud rate (bBB)
@@ -1657,7 +1665,7 @@ done:
* NB: We flush both caches, just to be sure...
*/
if (gdbstub_flush_caches)
gdbstub_purge_cache();
debugger_local_cache_flushinv();
gdbstub_load_fpu();
mn10300_set_gdbleds(0);
@@ -1667,14 +1675,23 @@ done:
touch_softlockup_watchdog();
local_irq_restore(epsw);
return 1;
return 0;
}
/*
* Determine if we hit a debugger special breakpoint that needs skipping over
* automatically.
*/
int at_debugger_breakpoint(struct pt_regs *regs)
{
return 0;
}
/*
* handle event interception
*/
asmlinkage int gdbstub_intercept(struct pt_regs *regs,
enum exception_code excep)
asmlinkage int debugger_intercept(enum exception_code excep,
int signo, int si_code, struct pt_regs *regs)
{
static u8 notfirst = 1;
int ret;
@@ -1688,7 +1705,7 @@ asmlinkage int gdbstub_intercept(struct pt_regs *regs,
asm("mov mdr,%0" : "=d"(mdr));
gdbstub_entry(
"--> gdbstub_intercept(%p,%04x) [MDR=%lx PC=%lx]\n",
"--> debugger_intercept(%p,%04x) [MDR=%lx PC=%lx]\n",
regs, excep, mdr, regs->pc);
gdbstub_entry(
@@ -1722,7 +1739,7 @@ asmlinkage int gdbstub_intercept(struct pt_regs *regs,
ret = gdbstub(regs, excep);
gdbstub_entry("<-- gdbstub_intercept()\n");
gdbstub_entry("<-- debugger_intercept()\n");
gdbstub_busy = 0;
return ret;
}
arch/mn10300/kernel/internal.h
+7
View File
@@ -29,6 +29,13 @@ extern void ret_from_fork(struct task_struct *) __attribute__((noreturn));
extern void mn10300_low_ipi_handler(void);
#endif
/*
* smp.c
*/
#ifdef CONFIG_SMP
extern void smp_jump_to_debugger(void);
#endif
/*
* time.c
*/
arch/mn10300/kernel/irq.c
+1 -1
View File
@@ -153,7 +153,7 @@ mn10300_cpupic_setaffinity(struct irq_data *d, const struct cpumask *mask,
case LOCAL_TIMER_IPI:
case FLUSH_CACHE_IPI:
case CALL_FUNCTION_NMI_IPI:
case GDB_NMI_IPI:
case DEBUGGER_NMI_IPI:
#ifdef CONFIG_MN10300_TTYSM0
case SC0RXIRQ:
case SC0TXIRQ:
arch/mn10300/kernel/kgdb.c
+502
View File
File diff suppressed because it is too large Load Diff
arch/mn10300/kernel/mn10300-serial.c
+75
View File
@@ -119,6 +119,10 @@ static int mn10300_serial_request_port(struct uart_port *);
static void mn10300_serial_config_port(struct uart_port *, int);
static int mn10300_serial_verify_port(struct uart_port *,
struct serial_struct *);
#ifdef CONFIG_CONSOLE_POLL
static void mn10300_serial_poll_put_char(struct uart_port *, unsigned char);
static int mn10300_serial_poll_get_char(struct uart_port *);
#endif
static const struct uart_ops mn10300_serial_ops = {
.tx_empty = mn10300_serial_tx_empty,
@@ -138,6 +142,10 @@ static const struct uart_ops mn10300_serial_ops = {
.request_port = mn10300_serial_request_port,
.config_port = mn10300_serial_config_port,
.verify_port = mn10300_serial_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_put_char = mn10300_serial_poll_put_char,
.poll_get_char = mn10300_serial_poll_get_char,
#endif
};
static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id);
@@ -1634,3 +1642,70 @@ static int __init mn10300_serial_console_init(void)
console_initcall(mn10300_serial_console_init);
#endif
#ifdef CONFIG_CONSOLE_POLL
/*
* Polled character reception for the kernel debugger
*/
static int mn10300_serial_poll_get_char(struct uart_port *_port)
{
struct mn10300_serial_port *port =
container_of(_port, struct mn10300_serial_port, uart);
unsigned ix;
u8 st, ch;
_enter("%s", port->name);
do {
/* pull chars out of the hat */
ix = port->rx_outp;
if (ix == port->rx_inp)
return NO_POLL_CHAR;
ch = port->rx_buffer[ix++];
st = port->rx_buffer[ix++];
smp_rmb();
port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1);
} while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF));
return ch;
}
/*
* Polled character transmission for the kernel debugger
*/
static void mn10300_serial_poll_put_char(struct uart_port *_port,
unsigned char ch)
{
struct mn10300_serial_port *port =
container_of(_port, struct mn10300_serial_port, uart);
u8 intr, tmp;
/* wait for the transmitter to finish anything it might be doing (and
* this includes the virtual DMA handler, so it might take a while) */
while (*port->_status & (SC01STR_TBF | SC01STR_TXF))
continue;
/* disable the Tx ready interrupt */
intr = *port->_intr;
*port->_intr = intr & ~SC01ICR_TI;
tmp = *port->_intr;
if (ch == 0x0a) {
*(u8 *) port->_txb = 0x0d;
while (*port->_status & SC01STR_TBF)
continue;
}
*(u8 *) port->_txb = ch;
while (*port->_status & SC01STR_TBF)
continue;
/* restore the Tx interrupt flag */
*port->_intr = intr;
tmp = *port->_intr;
}
#endif /* CONFIG_CONSOLE_POLL */
arch/mn10300/kernel/process.c
+3 -3
View File
@@ -135,7 +135,7 @@ void release_segments(struct mm_struct *mm)
void machine_restart(char *cmd)
{
#ifdef CONFIG_GDBSTUB
#ifdef CONFIG_KERNEL_DEBUGGER
gdbstub_exit(0);
#endif
@@ -148,14 +148,14 @@ void machine_restart(char *cmd)
void machine_halt(void)
{
#ifdef CONFIG_GDBSTUB
#ifdef CONFIG_KERNEL_DEBUGGER
gdbstub_exit(0);
#endif
}
void machine_power_off(void)
{
#ifdef CONFIG_GDBSTUB
#ifdef CONFIG_KERNEL_DEBUGGER
gdbstub_exit(0);
#endif
}

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