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authorwdenk <wdenk>2002-11-03 00:01:44 +0000
committerwdenk <wdenk>2002-11-03 00:01:44 +0000
commit47d1a6e1ed87fe1fb3d737acdb85f69bc3259522 (patch)
treebcf85bebad1b0b31392a84a649595beacaa57ab1 /common/cmd_bedbug.c
parente221174377d7e3ee848e014b96430d4c97023e93 (diff)
downloadu-boot-linaro-stable-47d1a6e1ed87fe1fb3d737acdb85f69bc3259522.tar.gz
Initial revision
Diffstat (limited to 'common/cmd_bedbug.c')
-rw-r--r--common/cmd_bedbug.c424
1 files changed, 424 insertions, 0 deletions
diff --git a/common/cmd_bedbug.c b/common/cmd_bedbug.c
new file mode 100644
index 000000000..75b74d50b
--- /dev/null
+++ b/common/cmd_bedbug.c
@@ -0,0 +1,424 @@
+/*
+ * BedBug Functions
+ */
+
+#include <common.h>
+#include <command.h>
+#include <linux/ctype.h>
+#include <net.h>
+
+#include <cmd_bedbug.h>
+#include <bedbug/bedbug.h>
+#include <bedbug/regs.h>
+#include <bedbug/ppc.h>
+#include <elf.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
+
+#ifndef MAX
+#define MAX(a,b) ((a) > (b) ? (a) : (b))
+#endif
+
+extern void show_regs __P((struct pt_regs*));
+extern int run_command __P((const char*, int));
+extern char console_buffer[];
+
+ulong dis_last_addr = 0; /* Last address disassembled */
+ulong dis_last_len = 20; /* Default disassembler length */
+CPU_DEBUG_CTX bug_ctx; /* Bedbug context structure */
+
+
+/* ======================================================================
+ * U-Boot's puts function does not append a newline, so the bedbug stuff
+ * will use this for the output of the dis/assembler.
+ * ====================================================================== */
+
+int bedbug_puts(const char *str)
+{
+ /* -------------------------------------------------- */
+
+ printf( "%s\r\n", str );
+ return 0;
+} /* bedbug_puts */
+
+
+
+/* ======================================================================
+ * Initialize the bug_ctx structure used by the bedbug debugger. This is
+ * specific to the CPU since each has different debug registers and
+ * settings.
+ * ====================================================================== */
+
+void bedbug_init( void )
+{
+ /* -------------------------------------------------- */
+
+#if defined(CONFIG_4xx)
+ void bedbug405_init( void );
+ bedbug405_init();
+#elif defined(CONFIG_MPC860)
+ void bedbug860_init( void );
+ bedbug860_init();
+#endif
+
+#if defined(CONFIG_MPC824X) || defined(CONFIG_MPC8260)
+ /* Processors that are 603e core based */
+ void bedbug603e_init( void );
+
+ bedbug603e_init();
+#endif
+
+ return;
+} /* bedbug_init */
+
+
+
+/* ======================================================================
+ * Entry point from the interpreter to the disassembler. Repeated calls
+ * will resume from the last disassembled address.
+ * ====================================================================== */
+int do_bedbug_dis (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ ulong addr; /* Address to start disassembly from */
+ ulong len; /* # of instructions to disassemble */
+ /* -------------------------------------------------- */
+
+ /* Setup to go from the last address if none is given */
+ addr = dis_last_addr;
+ len = dis_last_len;
+
+ if (argc < 2)
+ {
+ printf ("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+
+ if(( flag & CMD_FLAG_REPEAT ) == 0 )
+ {
+ /* New command */
+ addr = simple_strtoul( argv[1], NULL, 16 );
+
+ /* If an extra param is given then it is the length */
+ if( argc > 2 )
+ len = simple_strtoul( argv[2], NULL, 16 );
+ }
+
+ /* Run the disassembler */
+ disppc( (unsigned char *)addr, 0, len, bedbug_puts, F_RADHEX );
+
+ dis_last_addr = addr + (len * 4);
+ dis_last_len = len;
+ return 0;
+} /* do_bedbug_dis */
+
+
+
+/* ======================================================================
+ * Entry point from the interpreter to the assembler. Assembles
+ * instructions in consecutive memory locations until a '.' (period) is
+ * entered on a line by itself.
+ * ====================================================================== */
+int do_bedbug_asm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ long mem_addr; /* Address to assemble into */
+ unsigned long instr; /* Machine code for text */
+ char prompt[ 15 ]; /* Prompt string for user input */
+ int asm_err; /* Error code from the assembler*/
+ /* -------------------------------------------------- */
+ int rcode = 0;
+
+ if (argc < 2)
+ {
+ printf ("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+
+ printf( "\nEnter '.' when done\n" );
+ mem_addr = simple_strtoul( argv[ 1 ], NULL, 16 );
+
+ while( 1 )
+ {
+ putc( '\n' );
+ disppc( (unsigned char *)mem_addr, 0, 1, bedbug_puts, F_RADHEX );
+
+ sprintf( prompt, "%08lx: ", mem_addr );
+ readline( prompt );
+
+ if( console_buffer[ 0 ] && strcmp( console_buffer, "." ))
+ {
+ if(( instr = asmppc( mem_addr, console_buffer, &asm_err )) != 0 )
+ {
+ *(unsigned long *)mem_addr = instr;
+ mem_addr += 4;
+ }
+ else
+ {
+ printf( "*** Error: %s ***\n", asm_error_str( asm_err ));
+ rcode = 1;
+ }
+ }
+ else
+ {
+ break;
+ }
+ }
+ return rcode;
+} /* do_bedbug_asm */
+
+
+
+/* ======================================================================
+ * Used to set a break point from the interpreter. Simply calls into the
+ * CPU-specific break point set routine.
+ * ====================================================================== */
+
+int do_bedbug_break (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ /* -------------------------------------------------- */
+ if( bug_ctx.do_break )
+ (*bug_ctx.do_break)( cmdtp, flag, argc, argv );
+ return 0;
+
+} /* do_bedbug_break */
+
+
+
+/* ======================================================================
+ * Called from the debug interrupt routine. Simply calls the CPU-specific
+ * breakpoint handling routine.
+ * ====================================================================== */
+
+void do_bedbug_breakpoint (struct pt_regs *regs)
+{
+ /* -------------------------------------------------- */
+
+ if( bug_ctx.break_isr )
+ (*bug_ctx.break_isr)( regs );
+
+ return;
+} /* do_bedbug_breakpoint */
+
+
+
+/* ======================================================================
+ * Called from the CPU-specific breakpoint handling routine. Enter a
+ * mini main loop until the stopped flag is cleared from the breakpoint
+ * context.
+ *
+ * This handles the parts of the debugger that are common to all CPU's.
+ * ====================================================================== */
+
+void bedbug_main_loop( unsigned long addr, struct pt_regs *regs )
+{
+ int len; /* Length of command line */
+ int flag; /* Command flags */
+ int rc = 0; /* Result from run_command*/
+ char prompt_str[ 20 ]; /* Prompt string */
+ static char lastcommand[ CFG_CBSIZE ] = {0}; /* previous command */
+ /* -------------------------------------------------- */
+
+ if( bug_ctx.clear )
+ (*bug_ctx.clear)( bug_ctx.current_bp );
+
+ printf( "Breakpoint %d: ", bug_ctx.current_bp );
+ disppc( (unsigned char *)addr, 0, 1, bedbug_puts, F_RADHEX );
+
+ bug_ctx.stopped = 1;
+ bug_ctx.regs = regs;
+
+ sprintf( prompt_str, "BEDBUG.%d =>", bug_ctx.current_bp );
+
+ /* A miniature main loop */
+ while( bug_ctx.stopped )
+ {
+ len = readline( prompt_str );
+
+ flag = 0; /* assume no special flags for now */
+
+ if (len > 0)
+ strcpy( lastcommand, console_buffer );
+ else if( len == 0 )
+ flag |= CMD_FLAG_REPEAT;
+
+ if (len == -1)
+ printf ("<INTERRUPT>\n");
+ else
+ rc = run_command( lastcommand, flag );
+
+ if (rc <= 0) {
+ /* invalid command or not repeatable, forget it */
+ lastcommand[0] = 0;
+ }
+ }
+
+ bug_ctx.regs = NULL;
+ bug_ctx.current_bp = 0;
+
+ return;
+} /* bedbug_main_loop */
+
+
+
+/* ======================================================================
+ * Interpreter command to continue from a breakpoint. Just clears the
+ * stopped flag in the context so that the breakpoint routine will
+ * return.
+ * ====================================================================== */
+int do_bedbug_continue (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+
+{
+ /* -------------------------------------------------- */
+
+ if( ! bug_ctx.stopped )
+ {
+ printf( "Not at a breakpoint\n" );
+ return 1;
+ }
+
+ bug_ctx.stopped = 0;
+ return 0;
+} /* do_bedbug_continue */
+
+
+
+/* ======================================================================
+ * Interpreter command to continue to the next instruction, stepping into
+ * subroutines. Works by calling the find_next_addr() routine to compute
+ * the address passes control to the CPU-specific set breakpoint routine
+ * for the current breakpoint number.
+ * ====================================================================== */
+int do_bedbug_step (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ unsigned long addr; /* Address to stop at */
+ /* -------------------------------------------------- */
+
+ if( ! bug_ctx.stopped )
+ {
+ printf( "Not at a breakpoint\n" );
+ return 1;
+ }
+
+ if( !find_next_address( (unsigned char *)&addr, FALSE, bug_ctx.regs ))
+ return 1;
+
+ if( bug_ctx.set )
+ (*bug_ctx.set)( bug_ctx.current_bp, addr );
+
+ bug_ctx.stopped = 0;
+ return 0;
+} /* do_bedbug_step */
+
+
+
+/* ======================================================================
+ * Interpreter command to continue to the next instruction, stepping over
+ * subroutines. Works by calling the find_next_addr() routine to compute
+ * the address passes control to the CPU-specific set breakpoint routine
+ * for the current breakpoint number.
+ * ====================================================================== */
+int do_bedbug_next (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ unsigned long addr; /* Address to stop at */
+ /* -------------------------------------------------- */
+
+ if( ! bug_ctx.stopped )
+ {
+ printf( "Not at a breakpoint\n" );
+ return 1;
+ }
+
+ if( !find_next_address( (unsigned char *)&addr, TRUE, bug_ctx.regs ))
+ return 1;
+
+ if( bug_ctx.set )
+ (*bug_ctx.set)( bug_ctx.current_bp, addr );
+
+ bug_ctx.stopped = 0;
+ return 0;
+} /* do_bedbug_next */
+
+
+
+/* ======================================================================
+ * Interpreter command to print the current stack. This assumes an EABI
+ * architecture, so it starts with GPR R1 and works back up the stack.
+ * ====================================================================== */
+int do_bedbug_stack (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ DECLARE_GLOBAL_DATA_PTR;
+
+ unsigned long sp; /* Stack pointer */
+ unsigned long func; /* LR from stack */
+ int depth; /* Stack iteration level */
+ int skip = 1; /* Flag to skip the first entry */
+ unsigned long top; /* Top of memory address */
+ /* -------------------------------------------------- */
+
+ if( ! bug_ctx.stopped )
+ {
+ printf( "Not at a breakpoint\n" );
+ return 1;
+ }
+
+ top = gd->bd->bi_memstart + gd->bd->bi_memsize;
+ depth = 0;
+
+ printf( "Depth PC\n" );
+ printf( "----- --------\n" );
+ printf( "%5d %08lx\n", depth++, bug_ctx.regs->nip );
+
+ sp = bug_ctx.regs->gpr[ 1 ];
+ func = *(unsigned long *)(sp+4);
+
+ while(( func < top ) && ( sp < top ))
+ {
+ if( !skip )
+ printf( "%5d %08lx\n", depth++, func );
+ else
+ --skip;
+
+ sp = *(unsigned long *)sp;
+ func = *(unsigned long *)(sp+4);
+ }
+ return 0;
+} /* do_bedbug_stack */
+
+
+
+/* ======================================================================
+ * Interpreter command to dump the registers. Calls the CPU-specific
+ * show registers routine.
+ * ====================================================================== */
+int do_bedbug_rdump (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+ /* -------------------------------------------------- */
+
+ if( ! bug_ctx.stopped )
+ {
+ printf( "Not at a breakpoint\n" );
+ return 1;
+ }
+
+ show_regs( bug_ctx.regs );
+ return 0;
+} /* do_bedbug_rdump */
+
+
+/* ====================================================================== */
+#endif /* CFG_CMD_BEDBUG */
+
+
+/*
+ * Copyright (c) 2001 William L. Pitts
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are freely
+ * permitted provided that the above copyright notice and this
+ * paragraph and the following disclaimer are duplicated in all
+ * such forms.
+ *
+ * This software is provided "AS IS" and without any express or
+ * implied warranties, including, without limitation, the implied
+ * warranties of merchantability and fitness for a particular
+ * purpose.
+ */