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Add a "machine dcr" command, for the IBM4XX case, which permits

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reading/writing of the cpu's DCR registers.
This commit is contained in:
scw 2002-12-19 13:29:53 +00:00
parent c069154e9b
commit de98ba0a49
1 changed files with 77 additions and 2 deletions
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79
sys/arch/powerpc/powerpc/db_interface.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_interface.c,v 1.21 2002/11/25 05:10:39 thorpej Exp $ */
/* $NetBSD: db_interface.c,v 1.22 2002/12/19 13:29:53 scw Exp $ */
/* $OpenBSD: db_interface.c,v 1.2 1996/12/28 06:21:50 rahnds Exp $ */
#define USERACC
@ -26,6 +26,7 @@
#include <ddb/db_command.h>
#include <ddb/db_extern.h>
#include <ddb/db_access.h>
#include <ddb/db_lex.h>
#include <ddb/db_output.h>
#include <ddb/ddbvar.h>
#endif
@ -48,6 +49,9 @@ static void db_ppc4xx_pv(db_expr_t, int, db_expr_t, char *);
static void db_ppc4xx_reset(db_expr_t, int, db_expr_t, char *);
static void db_ppc4xx_tf(db_expr_t, int, db_expr_t, char *);
static void db_ppc4xx_dumptlb(db_expr_t, int, db_expr_t, char *);
static void db_ppc4xx_dcr(db_expr_t, int, db_expr_t, char *);
static db_expr_t db_ppc4xx_mfdcr(db_expr_t);
static void db_ppc4xx_mtdcr(db_expr_t, db_expr_t);
#ifdef USERACC
static void db_ppc4xx_useracc(db_expr_t, int, db_expr_t, char *);
#endif
@ -160,8 +164,9 @@ const struct db_command db_machine_command_table[] = {
{ "ctx", db_ppc4xx_ctx, 0, 0 },
{ "pv", db_ppc4xx_pv, 0, 0 },
{ "reset", db_ppc4xx_reset, 0, 0 },
{ "tf", db_ppc4xx_tf, 0, 0 },
{ "tf", db_ppc4xx_tf, 0, 0 },
{ "tlb", db_ppc4xx_dumptlb, 0, 0 },
{ "dcr", db_ppc4xx_dcr, CS_MORE|CS_SET_DOT, 0 },
#ifdef USERACC
{ "user", db_ppc4xx_useracc, 0, 0 },
#endif
@ -328,6 +333,76 @@ db_ppc4xx_dumptlb(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
}
}
static void
db_ppc4xx_dcr(db_expr_t address, int have_addr, db_expr_t count, char *modif)
{
db_expr_t new_value;
db_expr_t addr;
addr = address;
while (db_expression(&new_value)) {
db_printf("dcr 0x%lx\t\t%s = ", addr,
db_num_to_str(db_ppc4xx_mfdcr(addr)));
db_ppc4xx_mtdcr(addr, new_value);
db_printf("%s\n", db_num_to_str(db_ppc4xx_mfdcr(addr)));
addr += 1;
}
if (addr == address) {
db_next = (db_addr_t)addr + 1;
db_prev = (db_addr_t)addr;
db_printf("dcr 0x%lx\t\t%s\n", addr,
db_num_to_str(db_ppc4xx_mfdcr(addr)));
} else {
db_next = (db_addr_t)addr;
db_prev = (db_addr_t)addr - 1;
}
db_skip_to_eol();
}
/*
* XXX Grossness Alert! XXX
*
* Please look away now if you don't like self-modifying code
*/
static u_int32_t db_ppc4xx_dcrfunc[4];
static db_expr_t
db_ppc4xx_mfdcr(db_expr_t reg)
{
db_expr_t (*func)(void);
reg = (((reg & 0x1f) << 5) | ((reg >> 5) & 0x1f)) << 11;
db_ppc4xx_dcrfunc[0] = 0x7c0004ac; /* sync */
db_ppc4xx_dcrfunc[1] = 0x4c00012c; /* isync */
db_ppc4xx_dcrfunc[2] = 0x7c600286 | reg; /* mfdcr reg, r3 */
db_ppc4xx_dcrfunc[3] = 0x4e800020; /* blr */
__syncicache((void *)db_ppc4xx_dcrfunc, sizeof(db_ppc4xx_dcrfunc));
func = (db_expr_t (*)(void))(void *)db_ppc4xx_dcrfunc;
return ((*func)());
}
static void
db_ppc4xx_mtdcr(db_expr_t reg, db_expr_t val)
{
db_expr_t (*func)(db_expr_t);
reg = (((reg & 0x1f) << 5) | ((reg >> 5) & 0x1f)) << 11;
db_ppc4xx_dcrfunc[0] = 0x7c0004ac; /* sync */
db_ppc4xx_dcrfunc[1] = 0x4c00012c; /* isync */
db_ppc4xx_dcrfunc[2] = 0x7c600386 | reg; /* mtdcr r3, reg */
db_ppc4xx_dcrfunc[3] = 0x4e800020; /* blr */
__syncicache((void *)db_ppc4xx_dcrfunc, sizeof(db_ppc4xx_dcrfunc));
func = (db_expr_t (*)(db_expr_t))(void *)db_ppc4xx_dcrfunc;
(*func)(val);
}
#ifdef USERACC
static void
db_ppc4xx_useracc(db_expr_t addr, int have_addr, db_expr_t count, char *modif)