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sparc: Add kgdb support. 

Current limitations:

1) On SMP single stepping has some fundamental issues,
   shared with other sw single-step architectures such
   as mips and arm.

2) On 32-bit sparc we don't support SMP kgdb yet.  That
   requires some reworking of the IPI mechanisms and
   infrastructure on that platform.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-04-29 02:38:50 -07:00
parent 4d7ffa4990
commit e2fdd7fd99
20 changed files with 580 additions and 959 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/sparc/Kconfig
View File

@ -68,6 +68,7 @@ config SPARC
default y
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_ARCH_KGDB if !SMP
# Identify this as a Sparc32 build
config SPARC32

139
arch/sparc/defconfig
View File

@ -1,7 +1,7 @@
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.25
# Sun Apr 20 01:49:51 2008
# Tue Apr 29 01:28:58 2008
#
CONFIG_MMU=y
CONFIG_HIGHMEM=y
@ -217,12 +217,7 @@ CONFIG_IPV6_TUNNEL=m
# CONFIG_NETWORK_SECMARK is not set
# CONFIG_NETFILTER is not set
# CONFIG_IP_DCCP is not set
CONFIG_IP_SCTP=m
# CONFIG_SCTP_DBG_MSG is not set
CONFIG_SCTP_DBG_OBJCNT=y
# CONFIG_SCTP_HMAC_NONE is not set
# CONFIG_SCTP_HMAC_SHA1 is not set
CONFIG_SCTP_HMAC_MD5=y
# CONFIG_IP_SCTP is not set
# CONFIG_TIPC is not set
# CONFIG_ATM is not set
# CONFIG_BRIDGE is not set
@ -245,9 +240,7 @@ CONFIG_NET_PKTGEN=m
# CONFIG_CAN is not set
# CONFIG_IRDA is not set
# CONFIG_BT is not set
CONFIG_AF_RXRPC=m
# CONFIG_AF_RXRPC_DEBUG is not set
# CONFIG_RXKAD is not set
# CONFIG_AF_RXRPC is not set
#
# Wireless
@ -390,7 +383,7 @@ CONFIG_DUMMY=m
# CONFIG_BONDING is not set
# CONFIG_MACVLAN is not set
# CONFIG_EQUALIZER is not set
CONFIG_TUN=m
# CONFIG_TUN is not set
# CONFIG_VETH is not set
# CONFIG_ARCNET is not set
# CONFIG_PHYLIB is not set
@ -544,6 +537,7 @@ CONFIG_SERIAL_SUNSU_CONSOLE=y
# CONFIG_SERIAL_SUNSAB is not set
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y
CONFIG_CONSOLE_POLL=y
# CONFIG_SERIAL_JSM is not set
CONFIG_UNIX98_PTYS=y
CONFIG_LEGACY_PTYS=y
@ -595,6 +589,7 @@ CONFIG_SSB_POSSIBLE=y
# Multifunction device drivers
#
# CONFIG_MFD_SM501 is not set
# CONFIG_HTC_PASIC3 is not set
#
# Multimedia devices
@ -645,10 +640,6 @@ CONFIG_USB_ARCH_HAS_EHCI=y
# CONFIG_NEW_LEDS is not set
# CONFIG_INFINIBAND is not set
# CONFIG_RTC_CLASS is not set
#
# Userspace I/O
#
# CONFIG_UIO is not set
#
@ -680,16 +671,12 @@ CONFIG_FS_MBCACHE=y
# CONFIG_REISERFS_FS is not set
# CONFIG_JFS_FS is not set
CONFIG_FS_POSIX_ACL=y
CONFIG_XFS_FS=m
CONFIG_XFS_QUOTA=y
CONFIG_XFS_POSIX_ACL=y
CONFIG_XFS_RT=y
# CONFIG_XFS_FS is not set
# CONFIG_OCFS2_FS is not set
CONFIG_DNOTIFY=y
CONFIG_INOTIFY=y
CONFIG_INOTIFY_USER=y
# CONFIG_QUOTA is not set
CONFIG_QUOTACTL=y
CONFIG_AUTOFS_FS=m
CONFIG_AUTOFS4_FS=m
# CONFIG_FUSE_FS is not set
@ -725,11 +712,9 @@ CONFIG_SYSFS=y
#
# CONFIG_ADFS_FS is not set
# CONFIG_AFFS_FS is not set
# CONFIG_ECRYPT_FS is not set
# CONFIG_HFS_FS is not set
# CONFIG_HFSPLUS_FS is not set
CONFIG_BEFS_FS=m
# CONFIG_BEFS_DEBUG is not set
# CONFIG_BEFS_FS is not set
# CONFIG_BFS_FS is not set
# CONFIG_EFS_FS is not set
# CONFIG_CRAMFS is not set
@ -744,7 +729,6 @@ CONFIG_NETWORK_FILESYSTEMS=y
CONFIG_NFS_FS=y
# CONFIG_NFS_V3 is not set
# CONFIG_NFS_V4 is not set
# CONFIG_NFS_DIRECTIO is not set
# CONFIG_NFSD is not set
CONFIG_ROOT_NFS=y
CONFIG_LOCKD=y
@ -755,16 +739,10 @@ CONFIG_SUNRPC_GSS=m
CONFIG_RPCSEC_GSS_KRB5=m
# CONFIG_RPCSEC_GSS_SPKM3 is not set
# CONFIG_SMB_FS is not set
CONFIG_CIFS=m
# CONFIG_CIFS_STATS is not set
# CONFIG_CIFS_WEAK_PW_HASH is not set
# CONFIG_CIFS_XATTR is not set
# CONFIG_CIFS_DEBUG2 is not set
# CONFIG_CIFS_EXPERIMENTAL is not set
# CONFIG_CIFS is not set
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
CONFIG_AFS_FS=m
# CONFIG_AFS_DEBUG is not set
# CONFIG_AFS_FS is not set
#
# Partition Types
@ -821,6 +799,7 @@ CONFIG_TRACE_IRQFLAGS_SUPPORT=y
# CONFIG_PRINTK_TIME is not set
# CONFIG_ENABLE_WARN_DEPRECATED is not set
CONFIG_ENABLE_MUST_CHECK=y
CONFIG_FRAME_WARN=1024
CONFIG_MAGIC_SYSRQ=y
# CONFIG_UNUSED_SYMBOLS is not set
# CONFIG_DEBUG_FS is not set
@ -842,70 +821,105 @@ CONFIG_DETECT_SOFTLOCKUP=y
CONFIG_DEBUG_BUGVERBOSE=y
# CONFIG_DEBUG_INFO is not set
# CONFIG_DEBUG_VM is not set
# CONFIG_DEBUG_WRITECOUNT is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_SG is not set
CONFIG_FRAME_POINTER=y
# CONFIG_BOOT_PRINTK_DELAY is not set
# CONFIG_RCU_TORTURE_TEST is not set
# CONFIG_BACKTRACE_SELF_TEST is not set
# CONFIG_FAULT_INJECTION is not set
# CONFIG_SAMPLES is not set
CONFIG_KGDB=y
CONFIG_HAVE_ARCH_KGDB=y
CONFIG_KGDB_SERIAL_CONSOLE=y
CONFIG_KGDB_TESTS=y
# CONFIG_KGDB_TESTS_ON_BOOT is not set
# CONFIG_DEBUG_STACK_USAGE is not set
#
# Security options
#
CONFIG_KEYS=y
# CONFIG_KEYS_DEBUG_PROC_KEYS is not set
# CONFIG_KEYS is not set
# CONFIG_SECURITY is not set
# CONFIG_SECURITY_FILE_CAPABILITIES is not set
CONFIG_CRYPTO=y
#
# Crypto core or helper
#
CONFIG_CRYPTO_ALGAPI=y
CONFIG_CRYPTO_AEAD=y
CONFIG_CRYPTO_BLKCIPHER=y
# CONFIG_CRYPTO_SEQIV is not set
CONFIG_CRYPTO_HASH=y
CONFIG_CRYPTO_MANAGER=y
# CONFIG_CRYPTO_GF128MUL is not set
CONFIG_CRYPTO_NULL=m
# CONFIG_CRYPTO_CRYPTD is not set
CONFIG_CRYPTO_AUTHENC=y
# CONFIG_CRYPTO_TEST is not set
#
# Authenticated Encryption with Associated Data
#
# CONFIG_CRYPTO_CCM is not set
# CONFIG_CRYPTO_GCM is not set
# CONFIG_CRYPTO_SEQIV is not set
#
# Block modes
#
CONFIG_CRYPTO_CBC=y
# CONFIG_CRYPTO_CTR is not set
# CONFIG_CRYPTO_CTS is not set
CONFIG_CRYPTO_ECB=m
# CONFIG_CRYPTO_LRW is not set
CONFIG_CRYPTO_PCBC=m
# CONFIG_CRYPTO_XTS is not set
#
# Hash modes
#
CONFIG_CRYPTO_HMAC=y
# CONFIG_CRYPTO_XCBC is not set
CONFIG_CRYPTO_NULL=m
#
# Digest
#
CONFIG_CRYPTO_CRC32C=m
CONFIG_CRYPTO_MD4=y
CONFIG_CRYPTO_MD5=y
CONFIG_CRYPTO_MICHAEL_MIC=m
CONFIG_CRYPTO_SHA1=y
CONFIG_CRYPTO_SHA256=m
CONFIG_CRYPTO_SHA512=m
# CONFIG_CRYPTO_WP512 is not set
# CONFIG_CRYPTO_TGR192 is not set
# CONFIG_CRYPTO_GF128MUL is not set
CONFIG_CRYPTO_ECB=m
CONFIG_CRYPTO_CBC=y
CONFIG_CRYPTO_PCBC=m
# CONFIG_CRYPTO_LRW is not set
# CONFIG_CRYPTO_XTS is not set
# CONFIG_CRYPTO_CTR is not set
# CONFIG_CRYPTO_GCM is not set
# CONFIG_CRYPTO_CCM is not set
# CONFIG_CRYPTO_CRYPTD is not set
CONFIG_CRYPTO_DES=y
# CONFIG_CRYPTO_FCRYPT is not set
CONFIG_CRYPTO_BLOWFISH=m
CONFIG_CRYPTO_TWOFISH=m
CONFIG_CRYPTO_TWOFISH_COMMON=m
CONFIG_CRYPTO_SERPENT=m
# CONFIG_CRYPTO_WP512 is not set
#
# Ciphers
#
CONFIG_CRYPTO_AES=m
# CONFIG_CRYPTO_ANUBIS is not set
CONFIG_CRYPTO_ARC4=m
CONFIG_CRYPTO_BLOWFISH=m
# CONFIG_CRYPTO_CAMELLIA is not set
CONFIG_CRYPTO_CAST5=m
CONFIG_CRYPTO_CAST6=m
# CONFIG_CRYPTO_TEA is not set
CONFIG_CRYPTO_ARC4=m
CONFIG_CRYPTO_DES=y
# CONFIG_CRYPTO_FCRYPT is not set
# CONFIG_CRYPTO_KHAZAD is not set
# CONFIG_CRYPTO_ANUBIS is not set
# CONFIG_CRYPTO_SEED is not set
# CONFIG_CRYPTO_SALSA20 is not set
# CONFIG_CRYPTO_SEED is not set
CONFIG_CRYPTO_SERPENT=m
# CONFIG_CRYPTO_TEA is not set
CONFIG_CRYPTO_TWOFISH=m
CONFIG_CRYPTO_TWOFISH_COMMON=m
#
# Compression
#
CONFIG_CRYPTO_DEFLATE=y
CONFIG_CRYPTO_MICHAEL_MIC=m
CONFIG_CRYPTO_CRC32C=m
# CONFIG_CRYPTO_CAMELLIA is not set
# CONFIG_CRYPTO_TEST is not set
CONFIG_CRYPTO_AUTHENC=y
# CONFIG_CRYPTO_LZO is not set
# CONFIG_CRYPTO_HW is not set
@ -913,6 +927,7 @@ CONFIG_CRYPTO_AUTHENC=y
# Library routines
#
CONFIG_BITREVERSE=y
# CONFIG_GENERIC_FIND_FIRST_BIT is not set
# CONFIG_CRC_CCITT is not set
# CONFIG_CRC16 is not set
# CONFIG_CRC_ITU_T is not set

1
arch/sparc/kernel/Makefile
View File

@ -25,3 +25,4 @@ obj-$(CONFIG_PCI) += ebus.o
obj-$(CONFIG_SUN_PM) += apc.o pmc.o
obj-$(CONFIG_MODULES) += module.o sparc_ksyms.o
obj-$(CONFIG_SPARC_LED) += led.o
obj-$(CONFIG_KGDB) += kgdb.o

125
arch/sparc/kernel/entry.S
View File

@ -12,7 +12,6 @@
#include <asm/head.h>
#include <asm/asi.h>
#include <asm/smp.h>
#include <asm/kgdb.h>
#include <asm/contregs.h>
#include <asm/ptrace.h>
#include <asm/asm-offsets.h>
@ -45,91 +44,20 @@
_SV; _SV; _SV; _SV; _SV; _SV; _SV; \
_RS; _RS; _RS; _RS; _RS; _RS; _RS;
/* First, KGDB low level things. This is a rewrite
* of the routines found in the sparc-stub.c asm() statement
* from the gdb distribution. This is also dual-purpose
* as a software trap for userlevel programs.
*/
.data
.align 4
in_trap_handler:
.word 0
.text
#ifdef CONFIG_KGDB
.align 4
#if 0 /* kgdb is dropped from 2.5.33 */
! This function is called when any SPARC trap (except window overflow or
! underflow) occurs. It makes sure that the invalid register window is still
! available before jumping into C code. It will also restore the world if you
! return from handle_exception.
.globl trap_low
trap_low:
rd %wim, %l3
SAVE_ALL
sethi %hi(in_trap_handler), %l4
ld [%lo(in_trap_handler) + %l4], %l5
inc %l5
st %l5, [%lo(in_trap_handler) + %l4]
/* Make sure kgdb sees the same state we just saved. */
LOAD_PT_GLOBALS(sp)
LOAD_PT_INS(sp)
ld [%sp + STACKFRAME_SZ + PT_Y], %l4
ld [%sp + STACKFRAME_SZ + PT_WIM], %l3
ld [%sp + STACKFRAME_SZ + PT_PSR], %l0
ld [%sp + STACKFRAME_SZ + PT_PC], %l1
ld [%sp + STACKFRAME_SZ + PT_NPC], %l2
rd %tbr, %l5 /* Never changes... */
/* Make kgdb exception frame. */
sub %sp,(16+1+6+1+72)*4,%sp ! Make room for input & locals
! + hidden arg + arg spill
! + doubleword alignment
! + registers[72] local var
SAVE_KGDB_GLOBALS(sp)
SAVE_KGDB_INS(sp)
SAVE_KGDB_SREGS(sp, l4, l0, l3, l5, l1, l2)
/* We are increasing PIL, so two writes. */
or %l0, PSR_PIL, %l0
wr %l0, 0, %psr
WRITE_PAUSE
wr %l0, PSR_ET, %psr
WRITE_PAUSE
call handle_exception
add %sp, STACKFRAME_SZ, %o0 ! Pass address of registers
/* Load new kgdb register set. */
LOAD_KGDB_GLOBALS(sp)
LOAD_KGDB_INS(sp)
LOAD_KGDB_SREGS(sp, l4, l0, l3, l5, l1, l2)
wr %l4, 0x0, %y
sethi %hi(in_trap_handler), %l4
ld [%lo(in_trap_handler) + %l4], %l5
dec %l5
st %l5, [%lo(in_trap_handler) + %l4]
add %sp,(16+1+6+1+72)*4,%sp ! Undo the kgdb trap frame.
/* Now take what kgdb did and place it into the pt_regs
* frame which SparcLinux RESTORE_ALL understands.,
*/
STORE_PT_INS(sp)
STORE_PT_GLOBALS(sp)
STORE_PT_YREG(sp, g2)
STORE_PT_PRIV(sp, l0, l1, l2)
RESTORE_ALL
.globl arch_kgdb_breakpoint
.type arch_kgdb_breakpoint,#function
arch_kgdb_breakpoint:
ta 0x7d
retl
nop
.size arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
#endif
#if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
.text
.align 4
.globl floppy_hardint
floppy_hardint:
@ -1596,6 +1524,23 @@ breakpoint_trap:
RESTORE_ALL
#ifdef CONFIG_KGDB
.align 4
.globl kgdb_trap_low
.type kgdb_trap_low,#function
kgdb_trap_low:
rd %wim,%l3
SAVE_ALL
wr %l0, PSR_ET, %psr
WRITE_PAUSE
call kgdb_trap
add %sp, STACKFRAME_SZ, %o0
RESTORE_ALL
.size kgdb_trap_low,.-kgdb_trap_low
#endif
.align 4
.globl __handle_exception, flush_patch_exception
__handle_exception:
@ -1698,4 +1643,22 @@ pcic_nmi_trap_patch:
#endif /* CONFIG_PCI */
.globl flushw_all
flushw_all:
save %sp, -0x40, %sp
save %sp, -0x40, %sp
save %sp, -0x40, %sp
save %sp, -0x40, %sp
save %sp, -0x40, %sp
save %sp, -0x40, %sp
save %sp, -0x40, %sp
restore
restore
restore
restore
restore
restore
ret
restore
/* End of entry.S */

9
arch/sparc/kernel/head.S
View File

@ -191,7 +191,8 @@ t_bade8:BAD_TRAP(0xe8) BAD_TRAP(0xe9) BAD_TRAP(0xea) BAD_TRAP(0xeb) BAD_TRAP(0xe
t_baded:BAD_TRAP(0xed) BAD_TRAP(0xee) BAD_TRAP(0xef) BAD_TRAP(0xf0) BAD_TRAP(0xf1)
t_badf2:BAD_TRAP(0xf2) BAD_TRAP(0xf3) BAD_TRAP(0xf4) BAD_TRAP(0xf5) BAD_TRAP(0xf6)
t_badf7:BAD_TRAP(0xf7) BAD_TRAP(0xf8) BAD_TRAP(0xf9) BAD_TRAP(0xfa) BAD_TRAP(0xfb)
t_badfc:BAD_TRAP(0xfc) BAD_TRAP(0xfd)
t_badfc:BAD_TRAP(0xfc)
t_kgdb: KGDB_TRAP(0xfd)
dbtrap: BAD_TRAP(0xfe) /* Debugger/PROM breakpoint #1 */
dbtrap2:BAD_TRAP(0xff) /* Debugger/PROM breakpoint #2 */
@ -267,7 +268,7 @@ trapbase_cpu1:
BAD_TRAP(0xed) BAD_TRAP(0xee) BAD_TRAP(0xef) BAD_TRAP(0xf0) BAD_TRAP(0xf1)
BAD_TRAP(0xf2) BAD_TRAP(0xf3) BAD_TRAP(0xf4) BAD_TRAP(0xf5) BAD_TRAP(0xf6)
BAD_TRAP(0xf7) BAD_TRAP(0xf8) BAD_TRAP(0xf9) BAD_TRAP(0xfa) BAD_TRAP(0xfb)
BAD_TRAP(0xfc) BAD_TRAP(0xfd) BAD_TRAP(0xfe) BAD_TRAP(0xff)
BAD_TRAP(0xfc) KGDB_TRAP(0xfd) BAD_TRAP(0xfe) BAD_TRAP(0xff)
trapbase_cpu2:
BAD_TRAP(0x0) SRMMU_TFAULT TRAP_ENTRY(0x2, bad_instruction)
@ -335,7 +336,7 @@ trapbase_cpu2:
BAD_TRAP(0xed) BAD_TRAP(0xee) BAD_TRAP(0xef) BAD_TRAP(0xf0) BAD_TRAP(0xf1)
BAD_TRAP(0xf2) BAD_TRAP(0xf3) BAD_TRAP(0xf4) BAD_TRAP(0xf5) BAD_TRAP(0xf6)
BAD_TRAP(0xf7) BAD_TRAP(0xf8) BAD_TRAP(0xf9) BAD_TRAP(0xfa) BAD_TRAP(0xfb)
BAD_TRAP(0xfc) BAD_TRAP(0xfd) BAD_TRAP(0xfe) BAD_TRAP(0xff)
BAD_TRAP(0xfc) KGDB_TRAP(0xfd) BAD_TRAP(0xfe) BAD_TRAP(0xff)
trapbase_cpu3:
BAD_TRAP(0x0) SRMMU_TFAULT TRAP_ENTRY(0x2, bad_instruction)
@ -403,7 +404,7 @@ trapbase_cpu3:
BAD_TRAP(0xed) BAD_TRAP(0xee) BAD_TRAP(0xef) BAD_TRAP(0xf0) BAD_TRAP(0xf1)
BAD_TRAP(0xf2) BAD_TRAP(0xf3) BAD_TRAP(0xf4) BAD_TRAP(0xf5) BAD_TRAP(0xf6)
BAD_TRAP(0xf7) BAD_TRAP(0xf8) BAD_TRAP(0xf9) BAD_TRAP(0xfa) BAD_TRAP(0xfb)
BAD_TRAP(0xfc) BAD_TRAP(0xfd) BAD_TRAP(0xfe) BAD_TRAP(0xff)
BAD_TRAP(0xfc) KGDB_TRAP(0xfd) BAD_TRAP(0xfe) BAD_TRAP(0xff)
#endif
.align PAGE_SIZE

164
arch/sparc/kernel/kgdb.c Normal file
View File

@ -0,0 +1,164 @@
/* kgdb.c: KGDB support for 32-bit sparc.
*
* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <asm/kdebug.h>
#include <asm/ptrace.h>
#include <asm/irq.h>
extern unsigned long trapbase;
void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
struct reg_window *win;
int i;
gdb_regs[GDB_G0] = 0;
for (i = 0; i < 15; i++)
gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
win = (struct reg_window *) regs->u_regs[UREG_FP];
for (i = 0; i < 8; i++)
gdb_regs[GDB_L0 + i] = win->locals[i];
for (i = 0; i < 8; i++)
gdb_regs[GDB_I0 + i] = win->ins[i];
for (i = GDB_F0; i <= GDB_F31; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_Y] = regs->y;
gdb_regs[GDB_PSR] = regs->psr;
gdb_regs[GDB_WIM] = 0;
gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
gdb_regs[GDB_PC] = regs->pc;
gdb_regs[GDB_NPC] = regs->npc;
gdb_regs[GDB_FSR] = 0;
gdb_regs[GDB_CSR] = 0;
}
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
struct thread_info *t = task_thread_info(p);
struct reg_window *win;
int i;
for (i = GDB_G0; i < GDB_G6; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_G6] = (unsigned long) t;
gdb_regs[GDB_G7] = 0;
for (i = GDB_O0; i < GDB_SP; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_SP] = t->ksp;
gdb_regs[GDB_O7] = 0;
win = (struct reg_window *) t->ksp;
for (i = 0; i < 8; i++)
gdb_regs[GDB_L0 + i] = win->locals[i];
for (i = 0; i < 8; i++)
gdb_regs[GDB_I0 + i] = win->ins[i];
for (i = GDB_F0; i <= GDB_F31; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_Y] = 0;
gdb_regs[GDB_PSR] = t->kpsr;
gdb_regs[GDB_WIM] = t->kwim;
gdb_regs[GDB_TBR] = (unsigned long) &trapbase;
gdb_regs[GDB_PC] = t->kpc;
gdb_regs[GDB_NPC] = t->kpc + 4;
gdb_regs[GDB_FSR] = 0;
gdb_regs[GDB_CSR] = 0;
}
void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
struct reg_window *win;
int i;
for (i = 0; i < 15; i++)
regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
/* If the PSR register is changing, we have to preserve
* the CWP field, otherwise window save/restore explodes.
*/
if (regs->psr != gdb_regs[GDB_PSR]) {
unsigned long cwp = regs->psr & PSR_CWP;
regs->psr = (gdb_regs[GDB_PSR] & ~PSR_CWP) | cwp;
}
regs->pc = gdb_regs[GDB_PC];
regs->npc = gdb_regs[GDB_NPC];
regs->y = gdb_regs[GDB_Y];
win = (struct reg_window *) regs->u_regs[UREG_FP];
for (i = 0; i < 8; i++)
win->locals[i] = gdb_regs[GDB_L0 + i];
for (i = 0; i < 8; i++)
win->ins[i] = gdb_regs[GDB_I0 + i];
}
int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
char *remcomInBuffer, char *remcomOutBuffer,
struct pt_regs *linux_regs)
{
unsigned long addr;
char *ptr;
switch (remcomInBuffer[0]) {
case 'c':
/* try to read optional parameter, pc unchanged if no parm */
ptr = &remcomInBuffer[1];
if (kgdb_hex2long(&ptr, &addr)) {
linux_regs->pc = addr;
linux_regs->npc = addr + 4;
}
/* fallthru */
case 'D':
case 'k':
if (linux_regs->pc == (unsigned long) arch_kgdb_breakpoint) {
linux_regs->pc = linux_regs->npc;
linux_regs->npc += 4;
}
return 0;
}
return -1;
}
extern void do_hw_interrupt(struct pt_regs *regs, unsigned long type);
asmlinkage void kgdb_trap(struct pt_regs *regs)
{
unsigned long flags;
if (user_mode(regs)) {
do_hw_interrupt(regs, 0xfd);
return;
}
flushw_all();
local_irq_save(flags);
kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
local_irq_restore(flags);
}
int kgdb_arch_init(void)
{
return 0;
}
void kgdb_arch_exit(void)
{
}
struct kgdb_arch arch_kgdb_ops = {
/* Breakpoint instruction: ta 0x7d */
.gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x7d },
};

724
arch/sparc/kernel/sparc-stub.c
View File

@ -1,724 +0,0 @@
/* $Id: sparc-stub.c,v 1.28 2001/10/30 04:54:21 davem Exp $
* sparc-stub.c: KGDB support for the Linux kernel.
*
* Modifications to run under Linux
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*
* This file originally came from the gdb sources, and the
* copyright notices have been retained below.
*/
/****************************************************************************
THIS SOFTWARE IS NOT COPYRIGHTED
HP offers the following for use in the public domain. HP makes no
warranty with regard to the software or its performance and the
user accepts the software "AS IS" with all faults.
HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD
TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
****************************************************************************/
/****************************************************************************
* Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $
*
* Module name: remcom.c $
* Revision: 1.34 $
* Date: 91/03/09 12:29:49 $
* Contributor: Lake Stevens Instrument Division$
*
* Description: low level support for gdb debugger. $
*
* Considerations: only works on target hardware $
*
* Written by: Glenn Engel $
* ModuleState: Experimental $
*
* NOTES: See Below $
*
* Modified for SPARC by Stu Grossman, Cygnus Support.
*
* This code has been extensively tested on the Fujitsu SPARClite demo board.
*
* To enable debugger support, two things need to happen. One, a
* call to set_debug_traps() is necessary in order to allow any breakpoints
* or error conditions to be properly intercepted and reported to gdb.
* Two, a breakpoint needs to be generated to begin communication. This
* is most easily accomplished by a call to breakpoint(). Breakpoint()
* simulates a breakpoint by executing a trap #1.
*
*************
*
* The following gdb commands are supported:
*
* command function Return value
*
* g return the value of the CPU registers hex data or ENN
* G set the value of the CPU registers OK or ENN
*
* mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN
* MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN
*
* c Resume at current address SNN ( signal NN)
* cAA..AA Continue at address AA..AA SNN
*
* s Step one instruction SNN
* sAA..AA Step one instruction from AA..AA SNN
*
* k kill
*
* ? What was the last sigval ? SNN (signal NN)
*
* bBB..BB Set baud rate to BB..BB OK or BNN, then sets
* baud rate
*
* All commands and responses are sent with a packet which includes a
* checksum. A packet consists of
*
* $<packet info>#<checksum>.
*
* where
* <packet info> :: <characters representing the command or response>
* <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>>
*
* When a packet is received, it is first acknowledged with either '+' or '-'.
* '+' indicates a successful transfer. '-' indicates a failed transfer.
*
* Example:
*
* Host: Reply:
* $m0,10#2a +$00010203040506070809101112131415#42
*
****************************************************************************/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <asm/system.h>
#include <asm/signal.h>
#include <asm/oplib.h>
#include <asm/head.h>
#include <asm/traps.h>
#include <asm/vac-ops.h>
#include <asm/kgdb.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>
/*
*
* external low-level support routines
*/
extern void putDebugChar(char); /* write a single character */
extern char getDebugChar(void); /* read and return a single char */
/*
* BUFMAX defines the maximum number of characters in inbound/outbound buffers
* at least NUMREGBYTES*2 are needed for register packets
*/
#define BUFMAX 2048
static int initialized; /* !0 means we've been initialized */
static const char hexchars[]="0123456789abcdef";
#define NUMREGS 72
/* Number of bytes of registers. */
#define NUMREGBYTES (NUMREGS * 4)
enum regnames {G0, G1, G2, G3, G4, G5, G6, G7,
O0, O1, O2, O3, O4, O5, SP, O7,
L0, L1, L2, L3, L4, L5, L6, L7,
I0, I1, I2, I3, I4, I5, FP, I7,
F0, F1, F2, F3, F4, F5, F6, F7,
F8, F9, F10, F11, F12, F13, F14, F15,
F16, F17, F18, F19, F20, F21, F22, F23,
F24, F25, F26, F27, F28, F29, F30, F31,
Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR };
extern void trap_low(void); /* In arch/sparc/kernel/entry.S */
unsigned long get_sun4cpte(unsigned long addr)
{
unsigned long entry;
__asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" :
"=r" (entry) :
"r" (addr), "i" (ASI_PTE));
return entry;
}
unsigned long get_sun4csegmap(unsigned long addr)
{
unsigned long entry;
__asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
"=r" (entry) :
"r" (addr), "i" (ASI_SEGMAP));
return entry;
}
#if 0
/* Have to sort this out. This cannot be done after initialization. */
static void flush_cache_all_nop(void) {}
#endif
/* Place where we save old trap entries for restoration */
struct tt_entry kgdb_savettable[256];
typedef void (*trapfunc_t)(void);
/* Helper routine for manipulation of kgdb_savettable */
static inline void copy_ttentry(struct tt_entry *src, struct tt_entry *dest)
{
dest->inst_one = src->inst_one;
dest->inst_two = src->inst_two;
dest->inst_three = src->inst_three;
dest->inst_four = src->inst_four;
}
/* Initialize the kgdb_savettable so that debugging can commence */
static void eh_init(void)
{
int i;
for(i=0; i < 256; i++)
copy_ttentry(&sparc_ttable[i], &kgdb_savettable[i]);
}
/* Install an exception handler for kgdb */
static void exceptionHandler(int tnum, trapfunc_t trap_entry)
{
unsigned long te_addr = (unsigned long) trap_entry;
/* Make new vector */
sparc_ttable[tnum].inst_one =
SPARC_BRANCH((unsigned long) te_addr,
(unsigned long) &sparc_ttable[tnum].inst_one);
sparc_ttable[tnum].inst_two = SPARC_RD_PSR_L0;
sparc_ttable[tnum].inst_three = SPARC_NOP;
sparc_ttable[tnum].inst_four = SPARC_NOP;
}
/* Convert ch from a hex digit to an int */
static int
hex(unsigned char ch)
{
if (ch >= 'a' && ch <= 'f')
return ch-'a'+10;
if (ch >= '0' && ch <= '9')
return ch-'0';
if (ch >= 'A' && ch <= 'F')
return ch-'A'+10;
return -1;
}
/* scan for the sequence $<data>#<checksum> */
static void
getpacket(char *buffer)
{
unsigned char checksum;
unsigned char xmitcsum;
int i;
int count;
unsigned char ch;
do {
/* wait around for the start character, ignore all other characters */
while ((ch = (getDebugChar() & 0x7f)) != '$') ;
checksum = 0;
xmitcsum = -1;
count = 0;
/* now, read until a # or end of buffer is found */
while (count < BUFMAX) {
ch = getDebugChar() & 0x7f;
if (ch == '#')
break;
checksum = checksum + ch;
buffer[count] = ch;
count = count + 1;
}
if (count >= BUFMAX)
continue;
buffer[count] = 0;
if (ch == '#') {
xmitcsum = hex(getDebugChar() & 0x7f) << 4;
xmitcsum |= hex(getDebugChar() & 0x7f);
if (checksum != xmitcsum)
putDebugChar('-'); /* failed checksum */
else {
putDebugChar('+'); /* successful transfer */
/* if a sequence char is present, reply the ID */
if (buffer[2] == ':') {
putDebugChar(buffer[0]);
putDebugChar(buffer[1]);
/* remove sequence chars from buffer */
count = strlen(buffer);
for (i=3; i <= count; i++)
buffer[i-3] = buffer[i];
}
}
}
} while (checksum != xmitcsum);
}
/* send the packet in buffer. */
static void
putpacket(unsigned char *buffer)
{
unsigned char checksum;
int count;
unsigned char ch, recv;
/* $<packet info>#<checksum>. */
do {
putDebugChar('$');
checksum = 0;
count = 0;
while ((ch = buffer[count])) {
putDebugChar(ch);
checksum += ch;
count += 1;
}
putDebugChar('#');
putDebugChar(hexchars[checksum >> 4]);
putDebugChar(hexchars[checksum & 0xf]);
recv = getDebugChar();
} while ((recv & 0x7f) != '+');
}
static char remcomInBuffer[BUFMAX];
static char remcomOutBuffer[BUFMAX];
/* Convert the memory pointed to by mem into hex, placing result in buf.
* Return a pointer to the last char put in buf (null), in case of mem fault,
* return 0.
*/
static unsigned char *
mem2hex(char *mem, char *buf, int count)
{
unsigned char ch;
while (count-- > 0) {
/* This assembler code is basically: ch = *mem++;
* except that we use the SPARC/Linux exception table
* mechanism (see how "fixup" works in kernel_mna_trap_fault)
* to arrange for a "return 0" upon a memory fault
*/
__asm__(
"\n1:\n\t"
"ldub [%0], %1\n\t"
"inc %0\n\t"
".section .fixup,#alloc,#execinstr\n\t"
".align 4\n"
"2:\n\t"
"retl\n\t"
" mov 0, %%o0\n\t"
".section __ex_table, #alloc\n\t"
".align 4\n\t"
".word 1b, 2b\n\t"
".text\n"
: "=r" (mem), "=r" (ch) : "0" (mem));
*buf++ = hexchars[ch >> 4];
*buf++ = hexchars[ch & 0xf];
}
*buf = 0;
return buf;
}
/* convert the hex array pointed to by buf into binary to be placed in mem
* return a pointer to the character AFTER the last byte written.
*/
static char *
hex2mem(char *buf, char *mem, int count)
{
int i;
unsigned char ch;
for (i=0; i<count; i++) {
ch = hex(*buf++) << 4;
ch |= hex(*buf++);
/* Assembler code is *mem++ = ch; with return 0 on fault */
__asm__(
"\n1:\n\t"
"stb %1, [%0]\n\t"
"inc %0\n\t"
".section .fixup,#alloc,#execinstr\n\t"
".align 4\n"
"2:\n\t"
"retl\n\t"
" mov 0, %%o0\n\t"
".section __ex_table, #alloc\n\t"
".align 4\n\t"
".word 1b, 2b\n\t"
".text\n"
: "=r" (mem) : "r" (ch) , "0" (mem));
}
return mem;
}
/* This table contains the mapping between SPARC hardware trap types, and
signals, which are primarily what GDB understands. It also indicates
which hardware traps we need to commandeer when initializing the stub. */
static struct hard_trap_info
{
unsigned char tt; /* Trap type code for SPARC */
unsigned char signo; /* Signal that we map this trap into */
} hard_trap_info[] = {
{SP_TRAP_SBPT, SIGTRAP}, /* ta 1 - Linux/KGDB software breakpoint */
{0, 0} /* Must be last */
};
/* Set up exception handlers for tracing and breakpoints */
void
set_debug_traps(void)
{
struct hard_trap_info *ht;
unsigned long flags;
local_irq_save(flags);
#if 0
/* Have to sort this out. This cannot be done after initialization. */
BTFIXUPSET_CALL(flush_cache_all, flush_cache_all_nop, BTFIXUPCALL_NOP);
#endif
/* Initialize our copy of the Linux Sparc trap table */
eh_init();
for (ht = hard_trap_info; ht->tt && ht->signo; ht++) {
/* Only if it doesn't destroy our fault handlers */
if((ht->tt != SP_TRAP_TFLT) &&
(ht->tt != SP_TRAP_DFLT))
exceptionHandler(ht->tt, trap_low);
}
/* In case GDB is started before us, ack any packets (presumably
* "$?#xx") sitting there.
*
* I've found this code causes more problems than it solves,
* so that's why it's commented out. GDB seems to work fine
* now starting either before or after the kernel -bwb
*/
#if 0
while((c = getDebugChar()) != '$');
while((c = getDebugChar()) != '#');
c = getDebugChar(); /* eat first csum byte */
c = getDebugChar(); /* eat second csum byte */
putDebugChar('+'); /* ack it */
#endif
initialized = 1; /* connect! */
local_irq_restore(flags);
}
/* Convert the SPARC hardware trap type code to a unix signal number. */
static int
computeSignal(int tt)
{
struct hard_trap_info *ht;
for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
if (ht->tt == tt)
return ht->signo;
return SIGHUP; /* default for things we don't know about */
}
/*
* While we find nice hex chars, build an int.
* Return number of chars processed.
*/
static int
hexToInt(char **ptr, int *intValue)
{
int numChars = 0;
int hexValue;
*intValue = 0;
while (**ptr) {
hexValue = hex(**ptr);
if (hexValue < 0)
break;
*intValue = (*intValue << 4) | hexValue;
numChars ++;
(*ptr)++;
}
return (numChars);
}
/*
* This function does all command processing for interfacing to gdb. It
* returns 1 if you should skip the instruction at the trap address, 0
* otherwise.
*/
extern void breakinst(void);
void
handle_exception (unsigned long *registers)
{
int tt; /* Trap type */
int sigval;
int addr;
int length;
char *ptr;
unsigned long *sp;
/* First, we must force all of the windows to be spilled out */
asm("save %sp, -64, %sp\n\t"
"save %sp, -64, %sp\n\t"
"save %sp, -64, %sp\n\t"
"save %sp, -64, %sp\n\t"
"save %sp, -64, %sp\n\t"
"save %sp, -64, %sp\n\t"
"save %sp, -64, %sp\n\t"
"save %sp, -64, %sp\n\t"
"restore\n\t"
"restore\n\t"
"restore\n\t"
"restore\n\t"
"restore\n\t"
"restore\n\t"
"restore\n\t"
"restore\n\t");
lock_kernel();
if (registers[PC] == (unsigned long)breakinst) {
/* Skip over breakpoint trap insn */
registers[PC] = registers[NPC];
registers[NPC] += 4;
}
sp = (unsigned long *)registers[SP];
tt = (registers[TBR] >> 4) & 0xff;
/* reply to host that an exception has occurred */
sigval = computeSignal(tt);
ptr = remcomOutBuffer;
*ptr++ = 'T';
*ptr++ = hexchars[sigval >> 4];
*ptr++ = hexchars[sigval & 0xf];
*ptr++ = hexchars[PC >> 4];
*ptr++ = hexchars[PC & 0xf];
*ptr++ = ':';
ptr = mem2hex((char *)&registers[PC], ptr, 4);
*ptr++ = ';';
*ptr++ = hexchars[FP >> 4];
*ptr++ = hexchars[FP & 0xf];
*ptr++ = ':';
ptr = mem2hex((char *) (sp + 8 + 6), ptr, 4); /* FP */
*ptr++ = ';';
*ptr++ = hexchars[SP >> 4];
*ptr++ = hexchars[SP & 0xf];
*ptr++ = ':';
ptr = mem2hex((char *)&sp, ptr, 4);
*ptr++ = ';';
*ptr++ = hexchars[NPC >> 4];
*ptr++ = hexchars[NPC & 0xf];
*ptr++ = ':';
ptr = mem2hex((char *)&registers[NPC], ptr, 4);
*ptr++ = ';';
*ptr++ = hexchars[O7 >> 4];
*ptr++ = hexchars[O7 & 0xf];
*ptr++ = ':';
ptr = mem2hex((char *)&registers[O7], ptr, 4);
*ptr++ = ';';
*ptr++ = 0;
putpacket(remcomOutBuffer);
/* XXX We may want to add some features dealing with poking the
* XXX page tables, the real ones on the srmmu, and what is currently
* XXX loaded in the sun4/sun4c tlb at this point in time. But this
* XXX also required hacking to the gdb sources directly...
*/
while (1) {
remcomOutBuffer[0] = 0;
getpacket(remcomInBuffer);
switch (remcomInBuffer[0]) {
case '?':
remcomOutBuffer[0] = 'S';
remcomOutBuffer[1] = hexchars[sigval >> 4];
remcomOutBuffer[2] = hexchars[sigval & 0xf];
remcomOutBuffer[3] = 0;
break;
case 'd':
/* toggle debug flag */
break;
case 'g': /* return the value of the CPU registers */
{
ptr = remcomOutBuffer;
/* G & O regs */
ptr = mem2hex((char *)registers, ptr, 16 * 4);
/* L & I regs */
ptr = mem2hex((char *) (sp + 0), ptr, 16 * 4);
/* Floating point */
memset(ptr, '0', 32 * 8);
/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
mem2hex((char *)&registers[Y], (ptr + 32 * 4 * 2), (8 * 4));
}
break;
case 'G': /* set the value of the CPU registers - return OK */
{
unsigned long *newsp, psr;
psr = registers[PSR];
ptr = &remcomInBuffer[1];
/* G & O regs */
hex2mem(ptr, (char *)registers, 16 * 4);
/* L & I regs */
hex2mem(ptr + 16 * 4 * 2, (char *) (sp + 0), 16 * 4);
/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
hex2mem(ptr + 64 * 4 * 2, (char *)&registers[Y], 8 * 4);
/* See if the stack pointer has moved. If so,
* then copy the saved locals and ins to the
* new location. This keeps the window
* overflow and underflow routines happy.
*/
newsp = (unsigned long *)registers[SP];
if (sp != newsp)
sp = memcpy(newsp, sp, 16 * 4);
/* Don't allow CWP to be modified. */
if (psr != registers[PSR])
registers[PSR] = (psr & 0x1f) | (registers[PSR] & ~0x1f);
strcpy(remcomOutBuffer,"OK");
}
break;
case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
/* Try to read %x,%x. */
ptr = &remcomInBuffer[1];
if (hexToInt(&ptr, &addr)
&& *ptr++ == ','
&& hexToInt(&ptr, &length)) {
if (mem2hex((char *)addr, remcomOutBuffer, length))
break;
strcpy (remcomOutBuffer, "E03");
} else {
strcpy(remcomOutBuffer,"E01");
}
break;
case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
/* Try to read '%x,%x:'. */
ptr = &remcomInBuffer[1];
if (hexToInt(&ptr, &addr)
&& *ptr++ == ','
&& hexToInt(&ptr, &length)
&& *ptr++ == ':') {
if (hex2mem(ptr, (char *)addr, length)) {
strcpy(remcomOutBuffer, "OK");
} else {
strcpy(remcomOutBuffer, "E03");
}
} else {
strcpy(remcomOutBuffer, "E02");
}
break;
case 'c': /* cAA..AA Continue at address AA..AA(optional) */
/* try to read optional parameter, pc unchanged if no parm */
ptr = &remcomInBuffer[1];
if (hexToInt(&ptr, &addr)) {
registers[PC] = addr;
registers[NPC] = addr + 4;
}
/* Need to flush the instruction cache here, as we may have deposited a
* breakpoint, and the icache probably has no way of knowing that a data ref to
* some location may have changed something that is in the instruction cache.
*/
flush_cache_all();
unlock_kernel();
return;
/* kill the program */
case 'k' : /* do nothing */
break;
case 'r': /* Reset */
asm ("call 0\n\t"
"nop\n\t");
break;
} /* switch */
/* reply to the request */
putpacket(remcomOutBuffer);
} /* while(1) */
}
/* This function will generate a breakpoint exception. It is used at the
beginning of a program to sync up with a debugger and can be used
otherwise as a quick means to stop program execution and "break" into
the debugger. */
void
breakpoint(void)
{
if (!initialized)
return;
/* Again, watch those c-prefixes for ELF kernels */
#if defined(__svr4__) || defined(__ELF__)
asm(".globl breakinst\n"
"breakinst:\n\t"
"ta 1\n");
#else
asm(".globl _breakinst\n"
"_breakinst:\n\t"
"ta 1\n");
#endif
}

1
arch/sparc64/Kconfig
View File

@ -13,6 +13,7 @@ config SPARC64
default y
select HAVE_IDE
select HAVE_LMB
select HAVE_ARCH_KGDB
config GENERIC_TIME
bool

1
arch/sparc64/kernel/Makefile
View File

@ -29,3 +29,4 @@ obj-$(CONFIG_SUN_LDOMS) += ldc.o vio.o viohs.o ds.o
obj-$(CONFIG_AUDIT) += audit.o
obj-$(CONFIG_AUDIT)$(CONFIG_COMPAT) += compat_audit.o
obj-y += $(obj-yy)
obj-$(CONFIG_KGDB) += kgdb.o

186
arch/sparc64/kernel/kgdb.c Normal file
View File

@ -0,0 +1,186 @@
/* kgdb.c: KGDB support for 64-bit sparc.
*
* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/kgdb.h>
#include <linux/kdebug.h>
#include <asm/kdebug.h>
#include <asm/ptrace.h>
#include <asm/irq.h>
void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
struct reg_window *win;
int i;
gdb_regs[GDB_G0] = 0;
for (i = 0; i < 15; i++)
gdb_regs[GDB_G1 + i] = regs->u_regs[UREG_G1 + i];
win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
for (i = 0; i < 8; i++)
gdb_regs[GDB_L0 + i] = win->locals[i];
for (i = 0; i < 8; i++)
gdb_regs[GDB_I0 + i] = win->ins[i];
for (i = GDB_F0; i <= GDB_F62; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_PC] = regs->tpc;
gdb_regs[GDB_NPC] = regs->tnpc;
gdb_regs[GDB_STATE] = regs->tstate;
gdb_regs[GDB_FSR] = 0;
gdb_regs[GDB_FPRS] = 0;
gdb_regs[GDB_Y] = regs->y;
}
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
{
struct thread_info *t = task_thread_info(p);
extern unsigned int switch_to_pc;
extern unsigned int ret_from_syscall;
struct reg_window *win;
unsigned long pc, cwp;
int i;
for (i = GDB_G0; i < GDB_G6; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_G6] = (unsigned long) t;
gdb_regs[GDB_G7] = (unsigned long) p;
for (i = GDB_O0; i < GDB_SP; i++)
gdb_regs[i] = 0;
gdb_regs[GDB_SP] = t->ksp;
gdb_regs[GDB_O7] = 0;
win = (struct reg_window *) (t->ksp + STACK_BIAS);
for (i = 0; i < 8; i++)
gdb_regs[GDB_L0 + i] = win->locals[i];
for (i = 0; i < 8; i++)
gdb_regs[GDB_I0 + i] = win->ins[i];
for (i = GDB_F0; i <= GDB_F62; i++)
gdb_regs[i] = 0;
if (t->new_child)
pc = (unsigned long) &ret_from_syscall;
else
pc = (unsigned long) &switch_to_pc;
gdb_regs[GDB_PC] = pc;
gdb_regs[GDB_NPC] = pc + 4;
cwp = __thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP];
gdb_regs[GDB_STATE] = (TSTATE_PRIV | TSTATE_IE | cwp);
gdb_regs[GDB_FSR] = 0;
gdb_regs[GDB_FPRS] = 0;
gdb_regs[GDB_Y] = 0;
}
void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
struct reg_window *win;
int i;
for (i = 0; i < 15; i++)
regs->u_regs[UREG_G1 + i] = gdb_regs[GDB_G1 + i];
/* If the TSTATE register is changing, we have to preserve
* the CWP field, otherwise window save/restore explodes.
*/
if (regs->tstate != gdb_regs[GDB_STATE]) {
unsigned long cwp = regs->tstate & TSTATE_CWP;
regs->tstate = (gdb_regs[GDB_STATE] & ~TSTATE_CWP) | cwp;
}
regs->tpc = gdb_regs[GDB_PC];
regs->tnpc = gdb_regs[GDB_NPC];
regs->y = gdb_regs[GDB_Y];
win = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS);
for (i = 0; i < 8; i++)
win->locals[i] = gdb_regs[GDB_L0 + i];
for (i = 0; i < 8; i++)
win->ins[i] = gdb_regs[GDB_I0 + i];
}
#ifdef CONFIG_SMP
void smp_kgdb_capture_client(struct pt_regs *regs)
{
unsigned long flags;
__asm__ __volatile__("rdpr %%pstate, %0\n\t"
"wrpr %0, %1, %%pstate"
: "=r" (flags)
: "i" (PSTATE_IE));
flushw_all();
if (atomic_read(&kgdb_active) != -1)
kgdb_nmicallback(raw_smp_processor_id(), regs);
__asm__ __volatile__("wrpr %0, 0, %%pstate"
: : "r" (flags));
}
#endif
int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
char *remcomInBuffer, char *remcomOutBuffer,
struct pt_regs *linux_regs)
{
unsigned long addr;
char *ptr;
switch (remcomInBuffer[0]) {
case 'c':
/* try to read optional parameter, pc unchanged if no parm */
ptr = &remcomInBuffer[1];
if (kgdb_hex2long(&ptr, &addr)) {
linux_regs->tpc = addr;
linux_regs->tnpc = addr + 4;
}
/* fallthru */
case 'D':
case 'k':
if (linux_regs->tpc == (unsigned long) arch_kgdb_breakpoint) {
linux_regs->tpc = linux_regs->tnpc;
linux_regs->tnpc += 4;
}
return 0;
}
return -1;
}
asmlinkage void kgdb_trap(unsigned long trap_level, struct pt_regs *regs)
{
unsigned long flags;
if (user_mode(regs)) {
bad_trap(regs, trap_level);
return;
}
flushw_all();
local_irq_save(flags);
kgdb_handle_exception(0x172, SIGTRAP, 0, regs);
local_irq_restore(flags);
}
int kgdb_arch_init(void)
{
return 0;
}
void kgdb_arch_exit(void)
{
}
struct kgdb_arch arch_kgdb_ops = {
/* Breakpoint instruction: ta 0x72 */
.gdb_bpt_instr = { 0x91, 0xd0, 0x20, 0x72 },
};

10
arch/sparc64/kernel/misctrap.S
View File

@ -1,3 +1,13 @@
#ifdef CONFIG_KGDB
.globl arch_kgdb_breakpoint
.type arch_kgdb_breakpoint,#function
arch_kgdb_breakpoint:
ta 0x72
retl
nop
.size arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
#endif
.type __do_privact,#function
__do_privact:
mov TLB_SFSR, %g3

10
arch/sparc64/kernel/smp.c
View File

@ -910,6 +910,9 @@ extern unsigned long xcall_flush_tlb_kernel_range;
extern unsigned long xcall_report_regs;
extern unsigned long xcall_receive_signal;
extern unsigned long xcall_new_mmu_context_version;
#ifdef CONFIG_KGDB
extern unsigned long xcall_kgdb_capture;
#endif
#ifdef DCACHE_ALIASING_POSSIBLE
extern unsigned long xcall_flush_dcache_page_cheetah;
@ -1079,6 +1082,13 @@ void smp_new_mmu_context_version(void)
smp_cross_call(&xcall_new_mmu_context_version, 0, 0, 0);
}
#ifdef CONFIG_KGDB
void kgdb_roundup_cpus(unsigned long flags)
{
smp_cross_call(&xcall_kgdb_capture, 0, 0, 0);
}
#endif
void smp_report_regs(void)
{
smp_cross_call(&xcall_report_regs, 0, 0, 0);

2
arch/sparc64/kernel/ttable.S
View File

@ -153,7 +153,7 @@ tl0_resv164: BTRAP(0x164) BTRAP(0x165) BTRAP(0x166) BTRAP(0x167) BTRAP(0x168)
tl0_resv169: BTRAP(0x169) BTRAP(0x16a) BTRAP(0x16b) BTRAP(0x16c)
tl0_linux64: LINUX_64BIT_SYSCALL_TRAP
tl0_gsctx: TRAP(sparc64_get_context) TRAP(sparc64_set_context)
tl0_resv170: KPROBES_TRAP(0x170) KPROBES_TRAP(0x171) BTRAP(0x172)
tl0_resv170: KPROBES_TRAP(0x170) KPROBES_TRAP(0x171) KGDB_TRAP(0x172)
tl0_resv173: BTRAP(0x173) BTRAP(0x174) BTRAP(0x175) BTRAP(0x176) BTRAP(0x177)
tl0_resv178: BTRAP(0x178) BTRAP(0x179) BTRAP(0x17a) BTRAP(0x17b) BTRAP(0x17c)
tl0_resv17d: BTRAP(0x17d) BTRAP(0x17e) BTRAP(0x17f)

27
arch/sparc64/mm/ultra.S
View File

@ -676,6 +676,33 @@ xcall_new_mmu_context_version:
wr %g0, (1 << PIL_SMP_CTX_NEW_VERSION), %set_softint
retry
#ifdef CONFIG_KGDB
.globl xcall_kgdb_capture
xcall_kgdb_capture:
661: rdpr %pstate, %g2
wrpr %g2, PSTATE_IG | PSTATE_AG, %pstate
.section .sun4v_2insn_patch, "ax"
.word 661b
nop
nop
.previous
rdpr %pil, %g2
wrpr %g0, 15, %pil
sethi %hi(109f), %g7
ba,pt %xcc, etrap_irq
109: or %g7, %lo(109b), %g7
#ifdef CONFIG_TRACE_IRQFLAGS
call trace_hardirqs_off
nop
#endif
call smp_kgdb_capture_client
add %sp, PTREGS_OFF, %o0
/* Has to be a non-v9 branch due to the large distance. */
ba rtrap_xcall
ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
#endif
#endif /* CONFIG_SMP */

11
include/asm-sparc/head.h
View File

@ -52,6 +52,17 @@
nop; \
nop;
#ifdef CONFIG_KGDB
#define KGDB_TRAP(num) \
b kgdb_trap_low; \
rd %psr,%l0; \
nop; \
nop;
#else
#define KGDB_TRAP(num) \
BAD_TRAP(num)
#endif
/* The Get Condition Codes software trap for userland. */
#define GETCC_TRAP \
b getcc_trap_handler; mov %psr, %l0; nop; nop;

114
include/asm-sparc/kgdb.h
View File

@ -1,94 +1,38 @@
/* $Id: kgdb.h,v 1.8 1998/01/07 06:33:44 baccala Exp $
* kgdb.h: Defines and declarations for serial line source level
* remote debugging of the Linux kernel using gdb.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef _SPARC_KGDB_H
#define _SPARC_KGDB_H
#ifndef __ASSEMBLY__
/* To init the kgdb engine. */
extern void set_debug_traps(void);
#ifdef CONFIG_SPARC32
#define BUFMAX 2048
#else
#define BUFMAX 4096
#endif
/* To enter the debugger explicitly. */
extern void breakpoint(void);
/* For convenience we define the format of a kgdb trap breakpoint
* frame here also.
*/
struct kgdb_frame {
unsigned long globals[8];
unsigned long outs[8];
unsigned long locals[8];
unsigned long ins[8];
unsigned long fpregs[32];
unsigned long y;
unsigned long psr;
unsigned long wim;
unsigned long tbr;
unsigned long pc;
unsigned long npc;
unsigned long fpsr;
unsigned long cpsr;
enum regnames {
GDB_G0, GDB_G1, GDB_G2, GDB_G3, GDB_G4, GDB_G5, GDB_G6, GDB_G7,
GDB_O0, GDB_O1, GDB_O2, GDB_O3, GDB_O4, GDB_O5, GDB_SP, GDB_O7,
GDB_L0, GDB_L1, GDB_L2, GDB_L3, GDB_L4, GDB_L5, GDB_L6, GDB_L7,
GDB_I0, GDB_I1, GDB_I2, GDB_I3, GDB_I4, GDB_I5, GDB_FP, GDB_I7,
GDB_F0,
GDB_F31 = GDB_F0 + 31,
#ifdef CONFIG_SPARC32
GDB_Y, GDB_PSR, GDB_WIM, GDB_TBR, GDB_PC, GDB_NPC,
GDB_FSR, GDB_CSR,
#else
GDB_F32 = GDB_F0 + 32,
GDB_F62 = GDB_F32 + 15,
GDB_PC, GDB_NPC, GDB_STATE, GDB_FSR, GDB_FPRS, GDB_Y,
#endif
};
#endif /* !(__ASSEMBLY__) */
/* Macros for assembly usage of the kgdb breakpoint frame. */
#define KGDB_G0 0x000
#define KGDB_G1 0x004
#define KGDB_G2 0x008
#define KGDB_G4 0x010
#define KGDB_G6 0x018
#define KGDB_I0 0x020
#define KGDB_I2 0x028
#define KGDB_I4 0x030
#define KGDB_I6 0x038
#define KGDB_Y 0x100
#define KGDB_PSR 0x104
#define KGDB_WIM 0x108
#define KGDB_TBR 0x10c
#define KGDB_PC 0x110
#define KGDB_NPC 0x114
#ifdef CONFIG_SPARC32
#define NUMREGBYTES ((GDB_CSR + 1) * 4)
#else
#define NUMREGBYTES ((GDB_Y + 1) * 8)
#endif
#define SAVE_KGDB_GLOBALS(reg) \
std %g0, [%reg + STACKFRAME_SZ + KGDB_G0]; \
std %g2, [%reg + STACKFRAME_SZ + KGDB_G2]; \
std %g4, [%reg + STACKFRAME_SZ + KGDB_G4]; \
std %g6, [%reg + STACKFRAME_SZ + KGDB_G6];
extern void arch_kgdb_breakpoint(void);
#define SAVE_KGDB_INS(reg) \
std %i0, [%reg + STACKFRAME_SZ + KGDB_I0]; \
std %i2, [%reg + STACKFRAME_SZ + KGDB_I2]; \
std %i4, [%reg + STACKFRAME_SZ + KGDB_I4]; \
std %i6, [%reg + STACKFRAME_SZ + KGDB_I6];
#define BREAK_INSTR_SIZE 4
#define CACHE_FLUSH_IS_SAFE 1
#define SAVE_KGDB_SREGS(reg, reg_y, reg_psr, reg_wim, reg_tbr, reg_pc, reg_npc) \
st %reg_y, [%reg + STACKFRAME_SZ + KGDB_Y]; \
st %reg_psr, [%reg + STACKFRAME_SZ + KGDB_PSR]; \
st %reg_wim, [%reg + STACKFRAME_SZ + KGDB_WIM]; \
st %reg_tbr, [%reg + STACKFRAME_SZ + KGDB_TBR]; \
st %reg_pc, [%reg + STACKFRAME_SZ + KGDB_PC]; \
st %reg_npc, [%reg + STACKFRAME_SZ + KGDB_NPC];
#define LOAD_KGDB_GLOBALS(reg) \
ld [%reg + STACKFRAME_SZ + KGDB_G1], %g1; \
ldd [%reg + STACKFRAME_SZ + KGDB_G2], %g2; \
ldd [%reg + STACKFRAME_SZ + KGDB_G4], %g4; \
ldd [%reg + STACKFRAME_SZ + KGDB_G6], %g6;
#define LOAD_KGDB_INS(reg) \
ldd [%reg + STACKFRAME_SZ + KGDB_I0], %i0; \
ldd [%reg + STACKFRAME_SZ + KGDB_I2], %i2; \
ldd [%reg + STACKFRAME_SZ + KGDB_I4], %i4; \
ldd [%reg + STACKFRAME_SZ + KGDB_I6], %i6;
#define LOAD_KGDB_SREGS(reg, reg_y, reg_psr, reg_wim, reg_tbr, reg_pc, reg_npc) \
ld [%reg + STACKFRAME_SZ + KGDB_Y], %reg_y; \
ld [%reg + STACKFRAME_SZ + KGDB_PSR], %reg_psr; \
ld [%reg + STACKFRAME_SZ + KGDB_WIM], %reg_wim; \
ld [%reg + STACKFRAME_SZ + KGDB_TBR], %reg_tbr; \
ld [%reg + STACKFRAME_SZ + KGDB_PC], %reg_pc; \
ld [%reg + STACKFRAME_SZ + KGDB_NPC], %reg_npc;
#endif /* !(_SPARC_KGDB_H) */
#endif /* _SPARC_KGDB_H */

2
include/asm-sparc/system.h
View File

@ -94,6 +94,8 @@ extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
} while(0)
#endif
extern void flushw_all(void);
/*
* Flush windows so that the VM switch which follows
* would not pull the stack from under us.

1
include/asm-sparc64/kgdb.h Normal file
View File

@ -0,0 +1 @@
#include <asm-sparc/kgdb.h>

5
include/asm-sparc64/system.h
View File

@ -180,12 +180,13 @@ do { if (test_thread_flag(TIF_PERFCTR)) { \
"ldx [%%sp + 2047 + 0x70], %%i6\n\t" \
"ldx [%%sp + 2047 + 0x78], %%i7\n\t" \
"ldx [%%g6 + %9], %%g4\n\t" \
"brz,pt %%o7, 1f\n\t" \
"brz,pt %%o7, switch_to_pc\n\t" \
" mov %%g7, %0\n\t" \
"sethi %%hi(ret_from_syscall), %%g1\n\t" \
"jmpl %%g1 + %%lo(ret_from_syscall), %%g0\n\t" \
" nop\n\t" \
"1:\n\t" \
".globl switch_to_pc\n\t" \
"switch_to_pc:\n\t" \
: "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \
"=r" (__local_per_cpu_offset) \
: "0" (task_thread_info(next)), \

6
include/asm-sparc64/ttable.h
View File

@ -175,6 +175,12 @@
#define KPROBES_TRAP(lvl) TRAP_ARG(bad_trap, lvl)
#endif
#ifdef CONFIG_KGDB
#define KGDB_TRAP(lvl) TRAP_IRQ(kgdb_trap, lvl)
#else
#define KGDB_TRAP(lvl) TRAP_ARG(bad_trap, lvl)
#endif
#define SUN4V_ITSB_MISS \
ldxa [%g0] ASI_SCRATCHPAD, %g2; \
ldx [%g2 + HV_FAULT_I_ADDR_OFFSET], %g4; \