Commit e2fdd7fd authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
parent 4d7ffa49

arch/sparc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/sparc/defconfig

+77 −62
Original line number Diff line number Diff line 
#

# 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

arch/sparc/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/sparc/kernel/entry.S

+44 −81
Original line number Diff line number Diff line
@@ -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

	.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

#ifdef CONFIG_KGDB

	.align	4

	.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 */

arch/sparc/kernel/head.S

+5 −4
Original line number Diff line number Diff line
@@ -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

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