regs.c

/* regs.c - SPARC V8 architected registers state routines */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "host.h"
#include "misc.h"
#include "machine.h"
#include "loader.h"
#include "regs.h"

/* create a register file */
struct regs_t *
regs_create(void)
{
  struct regs_t *regs;

  regs = calloc(1, sizeof(struct regs_t));
  if (!regs)
    fatal("out of virtual memory"); 

  return regs;
}

/* initialize architected register state */
void
regs_init(struct regs_t *regs) /* register file to initialize */
{
  /* SPARC requires specific initialization beyond just zeroing memory */
  memset(regs, 0, sizeof(*regs));

  /* Initialize the CWP to the first window */
  regs->regs_R.CWP = 0;

  /* The PSR's CWP field should also be initialized.
     The 5 bits for CWP are bits 0-4 of the PSR. */
  regs->regs_C.PSR &= ~0x1F; // Clear CWP bits
  regs->regs_C.PSR |= (regs->regs_R.CWP & 0x1F);
}

/* destroy a register file */
void
regs_destroy(struct regs_t *regs) /* register file to release */
{
    if (regs)
        free(regs);
}