summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel')
-rw-r--r--arch/sparc/kernel/Makefile1
-rw-r--r--arch/sparc/kernel/entry.S125
-rw-r--r--arch/sparc/kernel/head.S9
-rw-r--r--arch/sparc/kernel/kgdb.c164
-rw-r--r--arch/sparc/kernel/sparc-stub.c724
5 files changed, 214 insertions, 809 deletions
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index 59700aaaae9..6e03a2a7863 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -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
diff --git a/arch/sparc/kernel/entry.S b/arch/sparc/kernel/entry.S
index 484c83d23ee..57d1bbdd0bd 100644
--- a/arch/sparc/kernel/entry.S
+++ b/arch/sparc/kernel/entry.S
@@ -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 */
diff --git a/arch/sparc/kernel/head.S b/arch/sparc/kernel/head.S
index b7f1e81c8ff..8bec05fa579 100644
--- a/arch/sparc/kernel/head.S
+++ b/arch/sparc/kernel/head.S
@@ -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
diff --git a/arch/sparc/kernel/kgdb.c b/arch/sparc/kernel/kgdb.c
new file mode 100644
index 00000000000..757805ce02e
--- /dev/null
+++ b/arch/sparc/kernel/kgdb.c
@@ -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 },
+};
diff --git a/arch/sparc/kernel/sparc-stub.c b/arch/sparc/kernel/sparc-stub.c
deleted file mode 100644
index e84f815e690..00000000000
--- a/arch/sparc/kernel/sparc-stub.c
+++ /dev/null
@@ -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
-}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-30 05:23:53 +0000