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- /*
- * Routines providing a simple monitor for use on the PowerMac.
- *
- * Copyright (C) 1996 Paul Mackerras.
- */
- #include <linux/config.h>
- #include <linux/errno.h>
- #include <linux/sched.h>
- #include <linux/smp.h>
- #include <linux/interrupt.h>
- #include <linux/bitops.h>
- #include <linux/kallsyms.h>
- #include <asm/ptrace.h>
- #include <asm/string.h>
- #include <asm/machdep.h>
- #include <asm/xmon.h>
- #include "nonstdio.h"
- #include "privinst.h"
- #define scanhex xmon_scanhex
- #define skipbl xmon_skipbl
- #ifdef CONFIG_SMP
- static unsigned long cpus_in_xmon = 0;
- static unsigned long got_xmon = 0;
- static volatile int take_xmon = -1;
- #endif /* CONFIG_SMP */
- static unsigned adrs;
- static int size = 1;
- static unsigned ndump = 64;
- static unsigned nidump = 16;
- static unsigned ncsum = 4096;
- static int termch;
- static u_int bus_error_jmp[100];
- #define setjmp xmon_setjmp
- #define longjmp xmon_longjmp
- /* Breakpoint stuff */
- struct bpt {
- unsigned address;
- unsigned instr;
- unsigned count;
- unsigned char enabled;
- };
- #define NBPTS 16
- static struct bpt bpts[NBPTS];
- static struct bpt dabr;
- static struct bpt iabr;
- static unsigned bpinstr = 0x7fe00008; /* trap */
- /* Prototypes */
- extern void (*debugger_fault_handler)(struct pt_regs *);
- static int cmds(struct pt_regs *);
- static int mread(unsigned, void *, int);
- static int mwrite(unsigned, void *, int);
- static void handle_fault(struct pt_regs *);
- static void byterev(unsigned char *, int);
- static void memex(void);
- static int bsesc(void);
- static void dump(void);
- static void prdump(unsigned, int);
- #ifdef __MWERKS__
- static void prndump(unsigned, int);
- static int nvreadb(unsigned);
- #endif
- static int ppc_inst_dump(unsigned, int);
- void print_address(unsigned);
- static int getsp(void);
- static void dump_hash_table(void);
- static void backtrace(struct pt_regs *);
- static void excprint(struct pt_regs *);
- static void prregs(struct pt_regs *);
- static void memops(int);
- static void memlocate(void);
- static void memzcan(void);
- static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned);
- int skipbl(void);
- int scanhex(unsigned *valp);
- static void scannl(void);
- static int hexdigit(int);
- void getstring(char *, int);
- static void flush_input(void);
- static int inchar(void);
- static void take_input(char *);
- /* static void openforth(void); */
- static unsigned read_spr(int);
- static void write_spr(int, unsigned);
- static void super_regs(void);
- static void symbol_lookup(void);
- static void remove_bpts(void);
- static void insert_bpts(void);
- static struct bpt *at_breakpoint(unsigned pc);
- static void bpt_cmds(void);
- void cacheflush(void);
- #ifdef CONFIG_SMP
- static void cpu_cmd(void);
- #endif /* CONFIG_SMP */
- static void csum(void);
- static void bootcmds(void);
- static void proccall(void);
- static void printtime(void);
- extern int print_insn_big_powerpc(FILE *, unsigned long, unsigned);
- extern void printf(const char *fmt, ...);
- extern int putchar(int ch);
- extern int setjmp(u_int *);
- extern void longjmp(u_int *, int);
- extern void xmon_enter(void);
- extern void xmon_leave(void);
- static unsigned start_tb[NR_CPUS][2];
- static unsigned stop_tb[NR_CPUS][2];
- #define GETWORD(v) (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3])
- #define isxdigit(c) (('0' <= (c) && (c) <= '9') \
- || ('a' <= (c) && (c) <= 'f') \
- || ('A' <= (c) && (c) <= 'F'))
- #define isalnum(c) (('0' <= (c) && (c) <= '9') \
- || ('a' <= (c) && (c) <= 'z') \
- || ('A' <= (c) && (c) <= 'Z'))
- #define isspace(c) (c == ' ' || c == '\t' || c == 10 || c == 13 || c == 0)
- static char *help_string = "\
- Commands:\n\
- d dump bytes\n\
- di dump instructions\n\
- df dump float values\n\
- dd dump double values\n\
- e print exception information\n\
- h dump hash table\n\
- m examine/change memory\n\
- mm move a block of memory\n\
- ms set a block of memory\n\
- md compare two blocks of memory\n\
- r print registers\n\
- S print special registers\n\
- t print backtrace\n\
- la lookup address\n\
- ls lookup symbol\n\
- C checksum\n\
- p call function with arguments\n\
- T print time\n\
- x exit monitor\n\
- zr reboot\n\
- zh halt\n\
- ";
- static int xmon_trace[NR_CPUS];
- #define SSTEP 1 /* stepping because of 's' command */
- #define BRSTEP 2 /* stepping over breakpoint */
- static struct pt_regs *xmon_regs[NR_CPUS];
- extern inline void sync(void)
- {
- asm volatile("sync; isync");
- }
- extern inline void __delay(unsigned int loops)
- {
- if (loops != 0)
- __asm__ __volatile__("mtctr %0; 1: bdnz 1b" : :
- "r" (loops) : "ctr");
- }
- /* Print an address in numeric and symbolic form (if possible) */
- static void xmon_print_symbol(unsigned long address, const char *mid,
- const char *after)
- {
- char *modname;
- const char *name = NULL;
- unsigned long offset, size;
- static char tmpstr[128];
- printf("%.8lx", address);
- if (setjmp(bus_error_jmp) == 0) {
- debugger_fault_handler = handle_fault;
- sync();
- name = kallsyms_lookup(address, &size, &offset, &modname,
- tmpstr);
- sync();
- /* wait a little while to see if we get a machine check */
- __delay(200);
- }
- debugger_fault_handler = NULL;
- if (name) {
- printf("%s%s+%#lx/%#lx", mid, name, offset, size);
- if (modname)
- printf(" [%s]", modname);
- }
- printf("%s", after);
- }
- static void get_tb(unsigned *p)
- {
- unsigned hi, lo, hiagain;
- if ((get_pvr() >> 16) == 1)
- return;
- do {
- asm volatile("mftbu %0; mftb %1; mftbu %2"
- : "=r" (hi), "=r" (lo), "=r" (hiagain));
- } while (hi != hiagain);
- p[0] = hi;
- p[1] = lo;
- }
- int xmon(struct pt_regs *excp)
- {
- struct pt_regs regs;
- int msr, cmd;
- get_tb(stop_tb[smp_processor_id()]);
- if (excp == NULL) {
- asm volatile ("stw 0,0(%0)\n\
- lwz 0,0(1)\n\
- stw 0,4(%0)\n\
- stmw 2,8(%0)" : : "b" (®s));
- regs.nip = regs.link = ((unsigned long *)regs.gpr[1])[1];
- regs.msr = get_msr();
- regs.ctr = get_ctr();
- regs.xer = get_xer();
- regs.ccr = get_cr();
- regs.trap = 0;
- excp = ®s;
- }
- msr = get_msr();
- set_msr(msr & ~0x8000); /* disable interrupts */
- xmon_regs[smp_processor_id()] = excp;
- xmon_enter();
- excprint(excp);
- #ifdef CONFIG_SMP
- if (test_and_set_bit(smp_processor_id(), &cpus_in_xmon))
- for (;;)
- ;
- while (test_and_set_bit(0, &got_xmon)) {
- if (take_xmon == smp_processor_id()) {
- take_xmon = -1;
- break;
- }
- }
- /*
- * XXX: breakpoints are removed while any cpu is in xmon
- */
- #endif /* CONFIG_SMP */
- remove_bpts();
- cmd = cmds(excp);
- if (cmd == 's') {
- xmon_trace[smp_processor_id()] = SSTEP;
- excp->msr |= 0x400;
- } else if (at_breakpoint(excp->nip)) {
- xmon_trace[smp_processor_id()] = BRSTEP;
- excp->msr |= 0x400;
- } else {
- xmon_trace[smp_processor_id()] = 0;
- insert_bpts();
- }
- xmon_leave();
- xmon_regs[smp_processor_id()] = NULL;
- #ifdef CONFIG_SMP
- clear_bit(0, &got_xmon);
- clear_bit(smp_processor_id(), &cpus_in_xmon);
- #endif /* CONFIG_SMP */
- set_msr(msr); /* restore interrupt enable */
- get_tb(start_tb[smp_processor_id()]);
- return cmd != 'X';
- }
- irqreturn_t
- xmon_irq(int irq, void *d, struct pt_regs *regs)
- {
- unsigned long flags;
- local_irq_save(flags);
- printf("Keyboard interrupt\n");
- xmon(regs);
- local_irq_restore(flags);
- return IRQ_HANDLED;
- }
- int
- xmon_bpt(struct pt_regs *regs)
- {
- struct bpt *bp;
- bp = at_breakpoint(regs->nip);
- if (!bp)
- return 0;
- if (bp->count) {
- --bp->count;
- remove_bpts();
- excprint(regs);
- xmon_trace[smp_processor_id()] = BRSTEP;
- regs->msr |= 0x400;
- } else {
- xmon(regs);
- }
- return 1;
- }
- int
- xmon_sstep(struct pt_regs *regs)
- {
- if (!xmon_trace[smp_processor_id()])
- return 0;
- if (xmon_trace[smp_processor_id()] == BRSTEP) {
- xmon_trace[smp_processor_id()] = 0;
- insert_bpts();
- } else {
- xmon(regs);
- }
- return 1;
- }
- int
- xmon_dabr_match(struct pt_regs *regs)
- {
- if (dabr.enabled && dabr.count) {
- --dabr.count;
- remove_bpts();
- excprint(regs);
- xmon_trace[smp_processor_id()] = BRSTEP;
- regs->msr |= 0x400;
- } else {
- dabr.instr = regs->nip;
- xmon(regs);
- }
- return 1;
- }
- int
- xmon_iabr_match(struct pt_regs *regs)
- {
- if (iabr.enabled && iabr.count) {
- --iabr.count;
- remove_bpts();
- excprint(regs);
- xmon_trace[smp_processor_id()] = BRSTEP;
- regs->msr |= 0x400;
- } else {
- xmon(regs);
- }
- return 1;
- }
- static struct bpt *
- at_breakpoint(unsigned pc)
- {
- int i;
- struct bpt *bp;
- if (dabr.enabled && pc == dabr.instr)
- return &dabr;
- if (iabr.enabled && pc == iabr.address)
- return &iabr;
- bp = bpts;
- for (i = 0; i < NBPTS; ++i, ++bp)
- if (bp->enabled && pc == bp->address)
- return bp;
- return NULL;
- }
- static void
- insert_bpts(void)
- {
- int i;
- struct bpt *bp;
- bp = bpts;
- for (i = 0; i < NBPTS; ++i, ++bp) {
- if (!bp->enabled)
- continue;
- if (mread(bp->address, &bp->instr, 4) != 4
- || mwrite(bp->address, &bpinstr, 4) != 4) {
- printf("Couldn't insert breakpoint at %x, disabling\n",
- bp->address);
- bp->enabled = 0;
- }
- store_inst((void *) bp->address);
- }
- #if !defined(CONFIG_8xx)
- if (dabr.enabled)
- set_dabr(dabr.address);
- if (iabr.enabled)
- set_iabr(iabr.address);
- #endif
- }
- static void
- remove_bpts(void)
- {
- int i;
- struct bpt *bp;
- unsigned instr;
- #if !defined(CONFIG_8xx)
- set_dabr(0);
- set_iabr(0);
- #endif
- bp = bpts;
- for (i = 0; i < NBPTS; ++i, ++bp) {
- if (!bp->enabled)
- continue;
- if (mread(bp->address, &instr, 4) == 4
- && instr == bpinstr
- && mwrite(bp->address, &bp->instr, 4) != 4)
- printf("Couldn't remove breakpoint at %x\n",
- bp->address);
- store_inst((void *) bp->address);
- }
- }
- static char *last_cmd;
- /* Command interpreting routine */
- static int
- cmds(struct pt_regs *excp)
- {
- int cmd;
- last_cmd = NULL;
- for(;;) {
- #ifdef CONFIG_SMP
- printf("%d:", smp_processor_id());
- #endif /* CONFIG_SMP */
- printf("mon> ");
- fflush(stdout);
- flush_input();
- termch = 0;
- cmd = skipbl();
- if( cmd == '\n' ) {
- if (last_cmd == NULL)
- continue;
- take_input(last_cmd);
- last_cmd = NULL;
- cmd = inchar();
- }
- switch (cmd) {
- case 'm':
- cmd = inchar();
- switch (cmd) {
- case 'm':
- case 's':
- case 'd':
- memops(cmd);
- break;
- case 'l':
- memlocate();
- break;
- case 'z':
- memzcan();
- break;
- default:
- termch = cmd;
- memex();
- }
- break;
- case 'd':
- dump();
- break;
- case 'l':
- symbol_lookup();
- break;
- case 'r':
- if (excp != NULL)
- prregs(excp); /* print regs */
- break;
- case 'e':
- if (excp == NULL)
- printf("No exception information\n");
- else
- excprint(excp);
- break;
- case 'S':
- super_regs();
- break;
- case 't':
- backtrace(excp);
- break;
- case 'f':
- cacheflush();
- break;
- case 'h':
- dump_hash_table();
- break;
- case 's':
- case 'x':
- case EOF:
- return cmd;
- case '?':
- printf(help_string);
- break;
- default:
- printf("Unrecognized command: ");
- if( ' ' < cmd && cmd <= '~' )
- putchar(cmd);
- else
- printf("\\x%x", cmd);
- printf(" (type ? for help)\n");
- break;
- case 'b':
- bpt_cmds();
- break;
- case 'C':
- csum();
- break;
- #ifdef CONFIG_SMP
- case 'c':
- cpu_cmd();
- break;
- #endif /* CONFIG_SMP */
- case 'z':
- bootcmds();
- break;
- case 'p':
- proccall();
- break;
- case 'T':
- printtime();
- break;
- }
- }
- }
- extern unsigned tb_to_us;
- #define mulhwu(x,y) \
- ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
- static void printtime(void)
- {
- unsigned int delta;
- delta = stop_tb[smp_processor_id()][1]
- - start_tb[smp_processor_id()][1];
- delta = mulhwu(tb_to_us, delta);
- printf("%u.%06u seconds\n", delta / 1000000, delta % 1000000);
- }
- static void bootcmds(void)
- {
- int cmd;
- cmd = inchar();
- if (cmd == 'r')
- ppc_md.restart(NULL);
- else if (cmd == 'h')
- ppc_md.halt();
- else if (cmd == 'p')
- ppc_md.power_off();
- }
- #ifdef CONFIG_SMP
- static void cpu_cmd(void)
- {
- unsigned cpu;
- int timeout;
- int cmd;
- cmd = inchar();
- if (cmd == 'i') {
- /* interrupt other cpu(s) */
- cpu = MSG_ALL_BUT_SELF;
- if (scanhex(&cpu))
- smp_send_xmon_break(cpu);
- return;
- }
- termch = cmd;
- if (!scanhex(&cpu)) {
- /* print cpus waiting or in xmon */
- printf("cpus stopped:");
- for (cpu = 0; cpu < NR_CPUS; ++cpu) {
- if (test_bit(cpu, &cpus_in_xmon)) {
- printf(" %d", cpu);
- if (cpu == smp_processor_id())
- printf("*", cpu);
- }
- }
- printf("\n");
- return;
- }
- /* try to switch to cpu specified */
- take_xmon = cpu;
- timeout = 10000000;
- while (take_xmon >= 0) {
- if (--timeout == 0) {
- /* yes there's a race here */
- take_xmon = -1;
- printf("cpu %u didn't take control\n", cpu);
- return;
- }
- }
- /* now have to wait to be given control back */
- while (test_and_set_bit(0, &got_xmon)) {
- if (take_xmon == smp_processor_id()) {
- take_xmon = -1;
- break;
- }
- }
- }
- #endif /* CONFIG_SMP */
- static unsigned short fcstab[256] = {
- 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
- 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
- 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
- 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
- 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
- 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
- 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
- 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
- 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
- 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
- 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
- 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
- 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
- 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
- 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
- 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
- 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
- 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
- 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
- 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
- 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
- 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
- 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
- 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
- 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
- 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
- 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
- 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
- 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
- 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
- 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
- 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
- };
- #define FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
- static void
- csum(void)
- {
- unsigned int i;
- unsigned short fcs;
- unsigned char v;
- if (!scanhex(&adrs))
- return;
- if (!scanhex(&ncsum))
- return;
- fcs = 0xffff;
- for (i = 0; i < ncsum; ++i) {
- if (mread(adrs+i, &v, 1) == 0) {
- printf("csum stopped at %x\n", adrs+i);
- break;
- }
- fcs = FCS(fcs, v);
- }
- printf("%x\n", fcs);
- }
- static void
- bpt_cmds(void)
- {
- int cmd;
- unsigned a;
- int mode, i;
- struct bpt *bp;
- cmd = inchar();
- switch (cmd) {
- #if !defined(CONFIG_8xx)
- case 'd':
- mode = 7;
- cmd = inchar();
- if (cmd == 'r')
- mode = 5;
- else if (cmd == 'w')
- mode = 6;
- else
- termch = cmd;
- cmd = inchar();
- if (cmd == 'p')
- mode &= ~4;
- else
- termch = cmd;
- dabr.address = 0;
- dabr.count = 0;
- dabr.enabled = scanhex(&dabr.address);
- scanhex(&dabr.count);
- if (dabr.enabled)
- dabr.address = (dabr.address & ~7) | mode;
- break;
- case 'i':
- cmd = inchar();
- if (cmd == 'p')
- mode = 2;
- else
- mode = 3;
- iabr.address = 0;
- iabr.count = 0;
- iabr.enabled = scanhex(&iabr.address);
- if (iabr.enabled)
- iabr.address |= mode;
- scanhex(&iabr.count);
- break;
- #endif
- case 'c':
- if (!scanhex(&a)) {
- /* clear all breakpoints */
- for (i = 0; i < NBPTS; ++i)
- bpts[i].enabled = 0;
- iabr.enabled = 0;
- dabr.enabled = 0;
- printf("All breakpoints cleared\n");
- } else {
- bp = at_breakpoint(a);
- if (bp == 0) {
- printf("No breakpoint at %x\n", a);
- } else {
- bp->enabled = 0;
- }
- }
- break;
- default:
- termch = cmd;
- if (!scanhex(&a)) {
- /* print all breakpoints */
- printf("type address count\n");
- if (dabr.enabled) {
- printf("data %.8x %8x [", dabr.address & ~7,
- dabr.count);
- if (dabr.address & 1)
- printf("r");
- if (dabr.address & 2)
- printf("w");
- if (!(dabr.address & 4))
- printf("p");
- printf("]\n");
- }
- if (iabr.enabled)
- printf("inst %.8x %8x\n", iabr.address & ~3,
- iabr.count);
- for (bp = bpts; bp < &bpts[NBPTS]; ++bp)
- if (bp->enabled)
- printf("trap %.8x %8x\n", bp->address,
- bp->count);
- break;
- }
- bp = at_breakpoint(a);
- if (bp == 0) {
- for (bp = bpts; bp < &bpts[NBPTS]; ++bp)
- if (!bp->enabled)
- break;
- if (bp >= &bpts[NBPTS]) {
- printf("Sorry, no free breakpoints\n");
- break;
- }
- }
- bp->enabled = 1;
- bp->address = a;
- bp->count = 0;
- scanhex(&bp->count);
- break;
- }
- }
- static void
- backtrace(struct pt_regs *excp)
- {
- unsigned sp;
- unsigned stack[2];
- struct pt_regs regs;
- extern char ret_from_except, ret_from_except_full, ret_from_syscall;
- printf("backtrace:\n");
-
- if (excp != NULL)
- sp = excp->gpr[1];
- else
- sp = getsp();
- scanhex(&sp);
- scannl();
- for (; sp != 0; sp = stack[0]) {
- if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
- break;
- printf("[%.8lx] ", stack);
- xmon_print_symbol(stack[1], " ", "\n");
- if (stack[1] == (unsigned) &ret_from_except
- || stack[1] == (unsigned) &ret_from_except_full
- || stack[1] == (unsigned) &ret_from_syscall) {
- if (mread(sp+16, ®s, sizeof(regs)) != sizeof(regs))
- break;
- printf("exception:%x [%x] %x\n", regs.trap, sp+16,
- regs.nip);
- sp = regs.gpr[1];
- if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
- break;
- }
- }
- }
- int
- getsp(void)
- {
- int x;
- asm("mr %0,1" : "=r" (x) :);
- return x;
- }
- void
- excprint(struct pt_regs *fp)
- {
- int trap;
- #ifdef CONFIG_SMP
- printf("cpu %d: ", smp_processor_id());
- #endif /* CONFIG_SMP */
- printf("vector: %x at pc=", fp->trap);
- xmon_print_symbol(fp->nip, ": ", ", lr=");
- xmon_print_symbol(fp->link, ": ", "\n");
- printf("msr = %x, sp = %x [%x]\n", fp->msr, fp->gpr[1], fp);
- trap = TRAP(fp);
- if (trap == 0x300 || trap == 0x600)
- printf("dar = %x, dsisr = %x\n", fp->dar, fp->dsisr);
- if (current)
- printf("current = %x, pid = %d, comm = %s\n",
- current, current->pid, current->comm);
- }
- void
- prregs(struct pt_regs *fp)
- {
- int n;
- unsigned base;
- if (scanhex(&base))
- fp = (struct pt_regs *) base;
- for (n = 0; n < 32; ++n) {
- printf("R%.2d = %.8x%s", n, fp->gpr[n],
- (n & 3) == 3? "\n": " ");
- if (n == 12 && !FULL_REGS(fp)) {
- printf("\n");
- break;
- }
- }
- printf("pc = %.8x msr = %.8x lr = %.8x cr = %.8x\n",
- fp->nip, fp->msr, fp->link, fp->ccr);
- printf("ctr = %.8x xer = %.8x trap = %4x\n",
- fp->ctr, fp->xer, fp->trap);
- }
- void
- cacheflush(void)
- {
- int cmd;
- unsigned nflush;
- cmd = inchar();
- if (cmd != 'i')
- termch = cmd;
- scanhex(&adrs);
- if (termch != '\n')
- termch = 0;
- nflush = 1;
- scanhex(&nflush);
- nflush = (nflush + 31) / 32;
- if (cmd != 'i') {
- for (; nflush > 0; --nflush, adrs += 0x20)
- cflush((void *) adrs);
- } else {
- for (; nflush > 0; --nflush, adrs += 0x20)
- cinval((void *) adrs);
- }
- }
- unsigned int
- read_spr(int n)
- {
- unsigned int instrs[2];
- int (*code)(void);
- instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
- instrs[1] = 0x4e800020;
- store_inst(instrs);
- store_inst(instrs+1);
- code = (int (*)(void)) instrs;
- return code();
- }
- void
- write_spr(int n, unsigned int val)
- {
- unsigned int instrs[2];
- int (*code)(unsigned int);
- instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
- instrs[1] = 0x4e800020;
- store_inst(instrs);
- store_inst(instrs+1);
- code = (int (*)(unsigned int)) instrs;
- code(val);
- }
- static unsigned int regno;
- extern char exc_prolog;
- extern char dec_exc;
- void
- super_regs(void)
- {
- int i, cmd;
- unsigned val;
- cmd = skipbl();
- if (cmd == '\n') {
- printf("msr = %x, pvr = %x\n", get_msr(), get_pvr());
- printf("sprg0-3 = %x %x %x %x\n", get_sprg0(), get_sprg1(),
- get_sprg2(), get_sprg3());
- printf("srr0 = %x, srr1 = %x\n", get_srr0(), get_srr1());
- #ifdef CONFIG_PPC_STD_MMU
- printf("sr0-15 =");
- for (i = 0; i < 16; ++i)
- printf(" %x", get_sr(i));
- printf("\n");
- #endif
- asm("mr %0,1" : "=r" (i) :);
- printf("sp = %x ", i);
- asm("mr %0,2" : "=r" (i) :);
- printf("toc = %x\n", i);
- return;
- }
- scanhex(®no);
- switch (cmd) {
- case 'w':
- val = read_spr(regno);
- scanhex(&val);
- write_spr(regno, val);
- /* fall through */
- case 'r':
- printf("spr %x = %x\n", regno, read_spr(regno));
- break;
- case 's':
- val = get_sr(regno);
- scanhex(&val);
- set_sr(regno, val);
- break;
- case 'm':
- val = get_msr();
- scanhex(&val);
- set_msr(val);
- break;
- }
- scannl();
- }
- #ifndef CONFIG_PPC_STD_MMU
- static void
- dump_hash_table(void)
- {
- printf("This CPU doesn't have a hash table.\n");
- }
- #else
- static void
- dump_hash_table_seg(unsigned seg, unsigned start, unsigned end)
- {
- extern void *Hash;
- extern unsigned long Hash_size;
- unsigned *htab = Hash;
- unsigned hsize = Hash_size;
- unsigned v, hmask, va, last_va = 0;
- int found, last_found, i;
- unsigned *hg, w1, last_w2 = 0, last_va0 = 0;
- last_found = 0;
- hmask = hsize / 64 - 1;
- va = start;
- start = (start >> 12) & 0xffff;
- end = (end >> 12) & 0xffff;
- for (v = start; v < end; ++v) {
- found = 0;
- hg = htab + (((v ^ seg) & hmask) * 16);
- w1 = 0x80000000 | (seg << 7) | (v >> 10);
- for (i = 0; i < 8; ++i, hg += 2) {
- if (*hg == w1) {
- found = 1;
- break;
- }
- }
- if (!found) {
- w1 ^= 0x40;
- hg = htab + ((~(v ^ seg) & hmask) * 16);
- for (i = 0; i < 8; ++i, hg += 2) {
- if (*hg == w1) {
- found = 1;
- break;
- }
- }
- }
- if (!(last_found && found && (hg[1] & ~0x180) == last_w2 + 4096)) {
- if (last_found) {
- if (last_va != last_va0)
- printf(" ... %x", last_va);
- printf("\n");
- }
- if (found) {
- printf("%x to %x", va, hg[1]);
- last_va0 = va;
- }
- last_found = found;
- }
- if (found) {
- last_w2 = hg[1] & ~0x180;
- last_va = va;
- }
- va += 4096;
- }
- if (last_found)
- printf(" ... %x\n", last_va);
- }
- static unsigned hash_ctx;
- static unsigned hash_start;
- static unsigned hash_end;
- static void
- dump_hash_table(void)
- {
- int seg;
- unsigned seg_start, seg_end;
- hash_ctx = 0;
- hash_start = 0;
- hash_end = 0xfffff000;
- scanhex(&hash_ctx);
- scanhex(&hash_start);
- scanhex(&hash_end);
- printf("Mappings for context %x\n", hash_ctx);
- seg_start = hash_start;
- for (seg = hash_start >> 28; seg <= hash_end >> 28; ++seg) {
- seg_end = (seg << 28) | 0x0ffff000;
- if (seg_end > hash_end)
- seg_end = hash_end;
- dump_hash_table_seg((hash_ctx << 4) + (seg * 0x111),
- seg_start, seg_end);
- seg_start = seg_end + 0x1000;
- }
- }
- #endif /* CONFIG_PPC_STD_MMU */
- /*
- * Stuff for reading and writing memory safely
- */
- int
- mread(unsigned adrs, void *buf, int size)
- {
- volatile int n;
- char *p, *q;
- n = 0;
- if( setjmp(bus_error_jmp) == 0 ){
- debugger_fault_handler = handle_fault;
- sync();
- p = (char *) adrs;
- q = (char *) buf;
- switch (size) {
- case 2: *(short *)q = *(short *)p; break;
- case 4: *(int *)q = *(int *)p; break;
- default:
- for( ; n < size; ++n ) {
- *q++ = *p++;
- sync();
- }
- }
- sync();
- /* wait a little while to see if we get a machine check */
- __delay(200);
- n = size;
- }
- debugger_fault_handler = NULL;
- return n;
- }
- int
- mwrite(unsigned adrs, void *buf, int size)
- {
- volatile int n;
- char *p, *q;
- n = 0;
- if( setjmp(bus_error_jmp) == 0 ){
- debugger_fault_handler = handle_fault;
- sync();
- p = (char *) adrs;
- q = (char *) buf;
- switch (size) {
- case 2: *(short *)p = *(short *)q; break;
- case 4: *(int *)p = *(int *)q; break;
- default:
- for( ; n < size; ++n ) {
- *p++ = *q++;
- sync();
- }
- }
- sync();
- n = size;
- } else {
- printf("*** Error writing address %x\n", adrs + n);
- }
- debugger_fault_handler = NULL;
- return n;
- }
- static int fault_type;
- static int fault_except;
- static char *fault_chars[] = { "--", "**", "##" };
- static void
- handle_fault(struct pt_regs *regs)
- {
- fault_except = TRAP(regs);
- fault_type = TRAP(regs) == 0x200? 0: TRAP(regs) == 0x300? 1: 2;
- longjmp(bus_error_jmp, 1);
- }
- #define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t))
- void
- byterev(unsigned char *val, int size)
- {
- int t;
-
- switch (size) {
- case 2:
- SWAP(val[0], val[1], t);
- break;
- case 4:
- SWAP(val[0], val[3], t);
- SWAP(val[1], val[2], t);
- break;
- }
- }
- static int brev;
- static int mnoread;
- void
- memex(void)
- {
- int cmd, inc, i, nslash;
- unsigned n;
- unsigned char val[4];
- last_cmd = "m\n";
- scanhex(&adrs);
- while ((cmd = skipbl()) != '\n') {
- switch( cmd ){
- case 'b': size = 1; break;
- case 'w': size = 2; break;
- case 'l': size = 4; break;
- case 'r': brev = !brev; break;
- case 'n': mnoread = 1; break;
- case '.': mnoread = 0; break;
- }
- }
- if( size <= 0 )
- size = 1;
- else if( size > 4 )
- size = 4;
- for(;;){
- if (!mnoread)
- n = mread(adrs, val, size);
- printf("%.8x%c", adrs, brev? 'r': ' ');
- if (!mnoread) {
- if (brev)
- byterev(val, size);
- putchar(' ');
- for (i = 0; i < n; ++i)
- printf("%.2x", val[i]);
- for (; i < size; ++i)
- printf("%s", fault_chars[fault_type]);
- }
- putchar(' ');
- inc = size;
- nslash = 0;
- for(;;){
- if( scanhex(&n) ){
- for (i = 0; i < size; ++i)
- val[i] = n >> (i * 8);
- if (!brev)
- byterev(val, size);
- mwrite(adrs, val, size);
- inc = size;
- }
- cmd = skipbl();
- if (cmd == '\n')
- break;
- inc = 0;
- switch (cmd) {
- case '\'':
- for(;;){
- n = inchar();
- if( n == '\\' )
- n = bsesc();
- else if( n == '\'' )
- break;
- for (i = 0; i < size; ++i)
- val[i] = n >> (i * 8);
- if (!brev)
- byterev(val, size);
- mwrite(adrs, val, size);
- adrs += size;
- }
- adrs -= size;
- inc = size;
- break;
- case ',':
- adrs += size;
- break;
- case '.':
- mnoread = 0;
- break;
- case ';':
- break;
- case 'x':
- case EOF:
- scannl();
- return;
- case 'b':
- case 'v':
- size = 1;
- break;
- case 'w':
- size = 2;
- break;
- case 'l':
- size = 4;
- break;
- case '^':
- adrs -= size;
- break;
- break;
- case '/':
- if (nslash > 0)
- adrs -= 1 << nslash;
- else
- nslash = 0;
- nslash += 4;
- adrs += 1 << nslash;
- break;
- case '\\':
- if (nslash < 0)
- adrs += 1 << -nslash;
- else
- nslash = 0;
- nslash -= 4;
- adrs -= 1 << -nslash;
- break;
- case 'm':
- scanhex(&adrs);
- break;
- case 'n':
- mnoread = 1;
- break;
- case 'r':
- brev = !brev;
- break;
- case '<':
- n = size;
- scanhex(&n);
- adrs -= n;
- break;
- case '>':
- n = size;
- scanhex(&n);
- adrs += n;
- break;
- }
- }
- adrs += inc;
- }
- }
- int
- bsesc(void)
- {
- int c;
- c = inchar();
- switch( c ){
- case 'n': c = '\n'; break;
- case 'r': c = '\r'; break;
- case 'b': c = '\b'; break;
- case 't': c = '\t'; break;
- }
- return c;
- }
- void
- dump(void)
- {
- int c;
- c = inchar();
- if ((isxdigit(c) && c != 'f' && c != 'd') || c == '\n')
- termch = c;
- scanhex(&adrs);
- if( termch != '\n')
- termch = 0;
- if( c == 'i' ){
- scanhex(&nidump);
- if( nidump == 0 )
- nidump = 16;
- adrs += ppc_inst_dump(adrs, nidump);
- last_cmd = "di\n";
- } else {
- scanhex(&ndump);
- if( ndump == 0 )
- ndump = 64;
- prdump(adrs, ndump);
- adrs += ndump;
- last_cmd = "d\n";
- }
- }
- void
- prdump(unsigned adrs, int ndump)
- {
- register int n, m, c, r, nr;
- unsigned char temp[16];
- for( n = ndump; n > 0; ){
- printf("%.8x", adrs);
- putchar(' ');
- r = n < 16? n: 16;
- nr = mread(adrs, temp, r);
- adrs += nr;
- for( m = 0; m < r; ++m ){
- putchar((m & 3) == 0 && m > 0? '.': ' ');
- if( m < nr )
- printf("%.2x", temp[m]);
- else
- printf("%s", fault_chars[fault_type]);
- }
- for(; m < 16; ++m )
- printf(" ");
- printf(" |");
- for( m = 0; m < r; ++m ){
- if( m < nr ){
- c = temp[m];
- putchar(' ' <= c && c <= '~'? c: '.');
- } else
- putchar(' ');
- }
- n -= r;
- for(; m < 16; ++m )
- putchar(' ');
- printf("|\n");
- if( nr < r )
- break;
- }
- }
- int
- ppc_inst_dump(unsigned adr, int count)
- {
- int nr, dotted;
- unsigned first_adr;
- unsigned long inst, last_inst = 0;
- unsigned char val[4];
- dotted = 0;
- for (first_adr = adr; count > 0; --count, adr += 4){
- nr = mread(adr, val, 4);
- if( nr == 0 ){
- const char *x = fault_chars[fault_type];
- printf("%.8x %s%s%s%s\n", adr, x, x, x, x);
- break;
- }
- inst = GETWORD(val);
- if (adr > first_adr && inst == last_inst) {
- if (!dotted) {
- printf(" ...\n");
- dotted = 1;
- }
- continue;
- }
- dotted = 0;
- last_inst = inst;
- printf("%.8x ", adr);
- printf("%.8x\t", inst);
- print_insn_big_powerpc(stdout, inst, adr); /* always returns 4 */
- printf("\n");
- }
- return adr - first_adr;
- }
- void
- print_address(unsigned addr)
- {
- printf("0x%x", addr);
- }
- /*
- * Memory operations - move, set, print differences
- */
- static unsigned mdest; /* destination address */
- static unsigned msrc; /* source address */
- static unsigned mval; /* byte value to set memory to */
- static unsigned mcount; /* # bytes to affect */
- static unsigned mdiffs; /* max # differences to print */
- void
- memops(int cmd)
- {
- scanhex(&mdest);
- if( termch != '\n' )
- termch = 0;
- scanhex(cmd == 's'? &mval: &msrc);
- if( termch != '\n' )
- termch = 0;
- scanhex(&mcount);
- switch( cmd ){
- case 'm':
- memmove((void *)mdest, (void *)msrc, mcount);
- break;
- case 's':
- memset((void *)mdest, mval, mcount);
- break;
- case 'd':
- if( termch != '\n' )
- termch = 0;
- scanhex(&mdiffs);
- memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs);
- break;
- }
- }
- void
- memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr)
- {
- unsigned n, prt;
- prt = 0;
- for( n = nb; n > 0; --n )
- if( *p1++ != *p2++ )
- if( ++prt <= maxpr )
- printf("%.8x %.2x # %.8x %.2x\n", (unsigned)p1 - 1,
- p1[-1], (unsigned)p2 - 1, p2[-1]);
- if( prt > maxpr )
- printf("Total of %d differences\n", prt);
- }
- static unsigned mend;
- static unsigned mask;
- void
- memlocate(void)
- {
- unsigned a, n;
- unsigned char val[4];
- last_cmd = "ml";
- scanhex(&mdest);
- if (termch != '\n') {
- termch = 0;
- scanhex(&mend);
- if (termch != '\n') {
- termch = 0;
- scanhex(&mval);
- mask = ~0;
- if (termch != '\n') termch = 0;
- scanhex(&mask);
- }
- }
- n = 0;
- for (a = mdest; a < mend; a += 4) {
- if (mread(a, val, 4) == 4
- && ((GETWORD(val) ^ mval) & mask) == 0) {
- printf("%.8x: %.8x\n", a, GETWORD(val));
- if (++n >= 10)
- break;
- }
- }
- }
- static unsigned mskip = 0x1000;
- static unsigned mlim = 0xffffffff;
- void
- memzcan(void)
- {
- unsigned char v;
- unsigned a;
- int ok, ook;
- scanhex(&mdest);
- if (termch != '\n') termch = 0;
- scanhex(&mskip);
- if (termch != '\n') termch = 0;
- scanhex(&mlim);
- ook = 0;
- for (a = mdest; a < mlim; a += mskip) {
- ok = mread(a, &v, 1);
- if (ok && !ook) {
- printf("%.8x .. ", a);
- fflush(stdout);
- } else if (!ok && ook)
- printf("%.8x\n", a - mskip);
- ook = ok;
- if (a + mskip < a)
- break;
- }
- if (ook)
- printf("%.8x\n", a - mskip);
- }
- void proccall(void)
- {
- unsigned int args[8];
- unsigned int ret;
- int i;
- typedef unsigned int (*callfunc_t)(unsigned int, unsigned int,
- unsigned int, unsigned int, unsigned int,
- unsigned int, unsigned int, unsigned int);
- callfunc_t func;
- scanhex(&adrs);
- if (termch != '\n')
- termch = 0;
- for (i = 0; i < 8; ++i)
- args[i] = 0;
- for (i = 0; i < 8; ++i) {
- if (!scanhex(&args[i]) || termch == '\n')
- break;
- termch = 0;
- }
- func = (callfunc_t) adrs;
- ret = 0;
- if (setjmp(bus_error_jmp) == 0) {
- debugger_fault_handler = handle_fault;
- sync();
- ret = func(args[0], args[1], args[2], args[3],
- args[4], args[5], args[6], args[7]);
- sync();
- printf("return value is %x\n", ret);
- } else {
- printf("*** %x exception occurred\n", fault_except);
- }
- debugger_fault_handler = NULL;
- }
- /* Input scanning routines */
- int
- skipbl(void)
- {
- int c;
- if( termch != 0 ){
- c = termch;
- termch = 0;
- } else
- c = inchar();
- while( c == ' ' || c == '\t' )
- c = inchar();
- return c;
- }
- #define N_PTREGS 44
- static char *regnames[N_PTREGS] = {
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
- "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
- "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
- "pc", "msr", "or3", "ctr", "lr", "xer", "ccr", "mq",
- "trap", "dar", "dsisr", "res"
- };
- int
- scanhex(unsigned *vp)
- {
- int c, d;
- unsigned v;
- c = skipbl();
- if (c == '%') {
- /* parse register name */
- char regname[8];
- int i;
- for (i = 0; i < sizeof(regname) - 1; ++i) {
- c = inchar();
- if (!isalnum(c)) {
- termch = c;
- break;
- }
- regname[i] = c;
- }
- regname[i] = 0;
- for (i = 0; i < N_PTREGS; ++i) {
- if (strcmp(regnames[i], regname) == 0) {
- unsigned *rp = (unsigned *)
- xmon_regs[smp_processor_id()];
- if (rp == NULL) {
- printf("regs not available\n");
- return 0;
- }
- *vp = rp[i];
- return 1;
- }
- }
- printf("invalid register name '%%%s'\n", regname);
- return 0;
- } else if (c == '$') {
- static char symname[128];
- int i;
- for (i=0; i<63; i++) {
- c = inchar();
- if (isspace(c)) {
- termch = c;
- break;
- }
- symname[i] = c;
- }
- symname[i++] = 0;
- *vp = 0;
- if (setjmp(bus_error_jmp) == 0) {
- debugger_fault_handler = handle_fault;
- sync();
- *vp = kallsyms_lookup_name(symname);
- sync();
- }
- debugger_fault_handler = NULL;
- if (!(*vp)) {
- printf("unknown symbol\n");
- return 0;
- }
- return 1;
- }
- d = hexdigit(c);
- if( d == EOF ){
- termch = c;
- return 0;
- }
- v = 0;
- do {
- v = (v << 4) + d;
- c = inchar();
- d = hexdigit(c);
- } while( d != EOF );
- termch = c;
- *vp = v;
- return 1;
- }
- void
- scannl(void)
- {
- int c;
- c = termch;
- termch = 0;
- while( c != '\n' )
- c = inchar();
- }
- int hexdigit(int c)
- {
- if( '0' <= c && c <= '9' )
- return c - '0';
- if( 'A' <= c && c <= 'F' )
- return c - ('A' - 10);
- if( 'a' <= c && c <= 'f' )
- return c - ('a' - 10);
- return EOF;
- }
- void
- getstring(char *s, int size)
- {
- int c;
- c = skipbl();
- do {
- if( size > 1 ){
- *s++ = c;
- --size;
- }
- c = inchar();
- } while( c != ' ' && c != '\t' && c != '\n' );
- termch = c;
- *s = 0;
- }
- static char line[256];
- static char *lineptr;
- void
- flush_input(void)
- {
- lineptr = NULL;
- }
- int
- inchar(void)
- {
- if (lineptr == NULL || *lineptr == 0) {
- if (fgets(line, sizeof(line), stdin) == NULL) {
- lineptr = NULL;
- return EOF;
- }
- lineptr = line;
- }
- return *lineptr++;
- }
- void
- take_input(char *str)
- {
- lineptr = str;
- }
- static void
- symbol_lookup(void)
- {
- int type = inchar();
- unsigned addr;
- static char tmp[128];
- switch (type) {
- case 'a':
- if (scanhex(&addr))
- xmon_print_symbol(addr, ": ", "\n");
- termch = 0;
- break;
- case 's':
- getstring(tmp, 64);
- if (setjmp(bus_error_jmp) == 0) {
- debugger_fault_handler = handle_fault;
- sync();
- addr = kallsyms_lookup_name(tmp);
- if (addr)
- printf("%s: %lx\n", tmp, addr);
- else
- printf("Symbol '%s' not found.\n", tmp);
- sync();
- }
- debugger_fault_handler = NULL;
- termch = 0;
- break;
- }
- }
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