327 lines
7.5 KiB
C
327 lines
7.5 KiB
C
#include <common.h>
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#include <command.h>
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#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
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#include <kgdb.h>
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#include <asm/signal.h>
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#include <asm/processor.h>
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#define PC_REGNUM 64
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#define SP_REGNUM 1
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void breakinst(void);
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int
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kgdb_setjmp(long *buf)
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{
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asm ("mflr 0; stw 0,0(%0);"
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"stw 1,4(%0); stw 2,8(%0);"
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"mfcr 0; stw 0,12(%0);"
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"stmw 13,16(%0)"
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: : "r" (buf));
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/* XXX should save fp regs as well */
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return 0;
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}
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void
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kgdb_longjmp(long *buf, int val)
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{
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if (val == 0)
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val = 1;
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asm ("lmw 13,16(%0);"
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"lwz 0,12(%0); mtcrf 0x38,0;"
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"lwz 0,0(%0); lwz 1,4(%0); lwz 2,8(%0);"
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"mtlr 0; mr 3,%1"
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: : "r" (buf), "r" (val));
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}
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static inline unsigned long
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get_msr(void)
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{
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unsigned long msr;
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asm volatile("mfmsr %0" : "=r" (msr):);
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return msr;
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}
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static inline void
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set_msr(unsigned long msr)
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{
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asm volatile("mtmsr %0" : : "r" (msr));
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}
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/* Convert the SPARC hardware trap type code to a unix signal number. */
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/*
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* This table contains the mapping between PowerPC hardware trap types, and
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* signals, which are primarily what GDB understands.
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*/
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static struct hard_trap_info
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{
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unsigned int tt; /* Trap type code for powerpc */
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unsigned char signo; /* Signal that we map this trap into */
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} hard_trap_info[] = {
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{ 0x200, SIGSEGV }, /* machine check */
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{ 0x300, SIGSEGV }, /* address error (store) */
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{ 0x400, SIGBUS }, /* instruction bus error */
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{ 0x500, SIGINT }, /* interrupt */
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{ 0x600, SIGBUS }, /* alingment */
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{ 0x700, SIGTRAP }, /* breakpoint trap */
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{ 0x800, SIGFPE }, /* fpu unavail */
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{ 0x900, SIGALRM }, /* decrementer */
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{ 0xa00, SIGILL }, /* reserved */
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{ 0xb00, SIGILL }, /* reserved */
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{ 0xc00, SIGCHLD }, /* syscall */
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{ 0xd00, SIGTRAP }, /* single-step/watch */
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{ 0xe00, SIGFPE }, /* fp assist */
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{ 0, 0} /* Must be last */
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};
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static int
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computeSignal(unsigned int tt)
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{
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struct hard_trap_info *ht;
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for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
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if (ht->tt == tt)
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return ht->signo;
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return SIGHUP; /* default for things we don't know about */
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}
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void
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kgdb_enter(struct pt_regs *regs, kgdb_data *kdp)
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{
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unsigned long msr;
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kdp->private[0] = msr = get_msr();
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set_msr(msr & ~MSR_EE); /* disable interrupts */
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if (regs->nip == (unsigned long)breakinst) {
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/* Skip over breakpoint trap insn */
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regs->nip += 4;
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}
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regs->msr &= ~MSR_SE;
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/* reply to host that an exception has occurred */
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kdp->sigval = computeSignal(regs->trap);
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kdp->nregs = 2;
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kdp->regs[0].num = PC_REGNUM;
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kdp->regs[0].val = regs->nip;
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kdp->regs[1].num = SP_REGNUM;
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kdp->regs[1].val = regs->gpr[SP_REGNUM];
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}
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void
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kgdb_exit(struct pt_regs *regs, kgdb_data *kdp)
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{
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unsigned long msr = kdp->private[0];
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if (kdp->extype & KGDBEXIT_WITHADDR)
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regs->nip = kdp->exaddr;
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switch (kdp->extype & KGDBEXIT_TYPEMASK) {
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case KGDBEXIT_KILL:
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case KGDBEXIT_CONTINUE:
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set_msr(msr);
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break;
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case KGDBEXIT_SINGLE:
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regs->msr |= MSR_SE;
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#if 0
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set_msr(msr | MSR_SE);
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#endif
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break;
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}
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}
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int
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kgdb_trap(struct pt_regs *regs)
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{
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return (regs->trap);
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}
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/* return the value of the CPU registers.
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* some of them are non-PowerPC names :(
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* they are stored in gdb like:
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* struct {
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* u32 gpr[32];
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* f64 fpr[32];
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* u32 pc, ps, cnd, lr; (ps=msr)
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* u32 cnt, xer, mq;
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* }
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*/
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#define SPACE_REQUIRED ((32*4)+(32*8)+(6*4))
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#ifdef CONFIG_8260
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/* store floating double indexed */
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#define STFDI(n,p) __asm__ __volatile__ ("stfd " #n ",%0" : "=o"(p[2*n]))
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/* store floating double multiple */
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#define STFDM(p) { STFDI( 0,p); STFDI( 1,p); STFDI( 2,p); STFDI( 3,p); \
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STFDI( 4,p); STFDI( 5,p); STFDI( 6,p); STFDI( 7,p); \
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STFDI( 8,p); STFDI( 9,p); STFDI(10,p); STFDI(11,p); \
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STFDI(12,p); STFDI(13,p); STFDI(14,p); STFDI(15,p); \
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STFDI(16,p); STFDI(17,p); STFDI(18,p); STFDI(19,p); \
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STFDI(20,p); STFDI(21,p); STFDI(22,p); STFDI(23,p); \
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STFDI(24,p); STFDI(25,p); STFDI(26,p); STFDI(27,p); \
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STFDI(28,p); STFDI(29,p); STFDI(30,p); STFDI(31,p); }
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#endif
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int
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kgdb_getregs(struct pt_regs *regs, char *buf, int max)
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{
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int i;
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unsigned long *ptr = (unsigned long *)buf;
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if (max < SPACE_REQUIRED)
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kgdb_error(KGDBERR_NOSPACE);
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if ((unsigned long)ptr & 3)
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kgdb_error(KGDBERR_ALIGNFAULT);
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/* General Purpose Regs */
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for (i = 0; i < 32; i++)
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*ptr++ = regs->gpr[i];
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/* Floating Point Regs */
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#ifdef CONFIG_8260
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STFDM(ptr);
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ptr += 32*2;
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#else
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for (i = 0; i < 32; i++) {
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*ptr++ = 0;
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*ptr++ = 0;
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}
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#endif
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/* pc, msr, cr, lr, ctr, xer, (mq is unused) */
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*ptr++ = regs->nip;
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*ptr++ = regs->msr;
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*ptr++ = regs->ccr;
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*ptr++ = regs->link;
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*ptr++ = regs->ctr;
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*ptr++ = regs->xer;
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return (SPACE_REQUIRED);
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}
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/* set the value of the CPU registers */
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#ifdef CONFIG_8260
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/* load floating double */
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#define LFD(n,v) __asm__ __volatile__ ("lfd " #n ",%0" :: "o"(v))
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/* load floating double indexed */
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#define LFDI(n,p) __asm__ __volatile__ ("lfd " #n ",%0" :: "o"((p)[2*n]))
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/* load floating double multiple */
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#define LFDM(p) { LFDI( 0,p); LFDI( 1,p); LFDI( 2,p); LFDI( 3,p); \
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LFDI( 4,p); LFDI( 5,p); LFDI( 6,p); LFDI( 7,p); \
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LFDI( 8,p); LFDI( 9,p); LFDI(10,p); LFDI(11,p); \
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LFDI(12,p); LFDI(13,p); LFDI(14,p); LFDI(15,p); \
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LFDI(16,p); LFDI(17,p); LFDI(18,p); LFDI(19,p); \
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LFDI(20,p); LFDI(21,p); LFDI(22,p); LFDI(23,p); \
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LFDI(24,p); LFDI(25,p); LFDI(26,p); LFDI(27,p); \
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LFDI(28,p); LFDI(29,p); LFDI(30,p); LFDI(31,p); }
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#endif
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void
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kgdb_putreg(struct pt_regs *regs, int regno, char *buf, int length)
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{
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unsigned long *ptr = (unsigned long *)buf;
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if (regno < 0 || regno >= 70)
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kgdb_error(KGDBERR_BADPARAMS);
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else if (regno >= 32 && regno < 64) {
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if (length < 8)
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kgdb_error(KGDBERR_NOSPACE);
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}
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else {
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if (length < 4)
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kgdb_error(KGDBERR_NOSPACE);
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}
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if ((unsigned long)ptr & 3)
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kgdb_error(KGDBERR_ALIGNFAULT);
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if (regno >= 0 && regno < 32)
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regs->gpr[regno] = *ptr;
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else switch (regno) {
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#ifdef CONFIG_8260
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#define caseF(n) \
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case (n) + 32: LFD(n, *ptr); break;
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caseF( 0) caseF( 1) caseF( 2) caseF( 3) caseF( 4) caseF( 5) caseF( 6) caseF( 7)
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caseF( 8) caseF( 9) caseF(10) caseF(11) caseF(12) caseF(13) caseF(14) caseF(15)
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caseF(16) caseF(17) caseF(18) caseF(19) caseF(20) caseF(21) caseF(22) caseF(23)
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caseF(24) caseF(25) caseF(26) caseF(27) caseF(28) caseF(29) caseF(30) caseF(31)
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#undef caseF
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#endif
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case 64: regs->nip = *ptr; break;
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case 65: regs->msr = *ptr; break;
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case 66: regs->ccr = *ptr; break;
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case 67: regs->link = *ptr; break;
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case 68: regs->ctr = *ptr; break;
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case 69: regs->ctr = *ptr; break;
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default:
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kgdb_error(KGDBERR_BADPARAMS);
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}
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}
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void
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kgdb_putregs(struct pt_regs *regs, char *buf, int length)
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{
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int i;
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unsigned long *ptr = (unsigned long *)buf;
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if (length < SPACE_REQUIRED)
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kgdb_error(KGDBERR_NOSPACE);
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if ((unsigned long)ptr & 3)
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kgdb_error(KGDBERR_ALIGNFAULT);
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/*
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* If the stack pointer has moved, you should pray.
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* (cause only god can help you).
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*/
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/* General Purpose Regs */
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for (i = 0; i < 32; i++)
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regs->gpr[i] = *ptr++;
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/* Floating Point Regs */
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#ifdef CONFIG_8260
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LFDM(ptr);
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#endif
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ptr += 32*2;
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/* pc, msr, cr, lr, ctr, xer, (mq is unused) */
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regs->nip = *ptr++;
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regs->msr = *ptr++;
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regs->ccr = *ptr++;
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regs->link = *ptr++;
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regs->ctr = *ptr++;
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regs->xer = *ptr++;
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}
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/* This function will generate a breakpoint exception. It is used at the
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beginning of a program to sync up with a debugger and can be used
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otherwise as a quick means to stop program execution and "break" into
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the debugger. */
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void
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kgdb_breakpoint(int argc, char *argv[])
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{
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asm(" .globl breakinst\n\
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breakinst: .long 0x7d821008\n\
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");
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}
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#endif /* CFG_CMD_KGDB */
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