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Add "show sysregs" command to ddb. On i386, this gives gdt, idt, ldt,

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cr0-4, etc.  Support should be added for other platforms that have a
different set of registers for system use.

Loosely based on: OpenBSD
Approved by:	re
This commit is contained in:
Nate Lawson 2007-08-09 20:14:35 +00:00
parent c7f6197937
commit 3b3f28135f
3 changed files with 73 additions and 12 deletions
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8
share/man/man4/ddb.4
View File

@ -59,7 +59,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd October 27, 2006
.Dd August 6, 2007
.Dt DDB 4
.Os
.Sh NAME
@ -522,6 +522,12 @@ The support of the
modifier depends on the machine.
If not supported, incorrect information will be displayed.
.Pp
.It Ic show Cm sysregs
Show system registers (e.g.,
.Li cr0-4
on i386.)
Not present on some platforms.
.Pp
.It Ic show Cm geom Op Ar addr
If the
.Ar addr

19
sys/i386/i386/machdep.c
View File

@ -1587,6 +1587,25 @@ DB_SHOW_COMMAND(idt, db_show_idt)
ip++;
}
}
/* Show privileged registers. */
DB_SHOW_COMMAND(sysregs, db_show_sysregs)
{
uint64_t idtr, gdtr;
idtr = ridt();
db_printf("idtr\t0x%08x/%04x\n",
(u_int)(idtr >> 16), (u_int)idtr & 0xffff);
gdtr = rgdt();
db_printf("gdtr\t0x%08x/%04x\n",
(u_int)(gdtr >> 16), (u_int)gdtr & 0xffff);
db_printf("ldtr\t0x%04x\n", rldt());
db_printf("tr\t0x%04x\n", rtr());
db_printf("cr0\t0x%08x\n", rcr0());
db_printf("cr2\t0x%08x\n", rcr2());
db_printf("cr3\t0x%08x\n", rcr3());
db_printf("cr4\t0x%08x\n", rcr4());
}
#endif
void

58
sys/i386/include/cpufunc.h
View File

@ -326,28 +326,28 @@ read_eflags(void)
return (ef);
}
static __inline u_int64_t
static __inline uint64_t
rdmsr(u_int msr)
{
u_int64_t rv;
uint64_t rv;
__asm __volatile("rdmsr" : "=A" (rv) : "c" (msr));
return (rv);
}
static __inline u_int64_t
static __inline uint64_t
rdpmc(u_int pmc)
{
u_int64_t rv;
uint64_t rv;
__asm __volatile("rdpmc" : "=A" (rv) : "c" (pmc));
return (rv);
}
static __inline u_int64_t
static __inline uint64_t
rdtsc(void)
{
u_int64_t rv;
uint64_t rv;
__asm __volatile("rdtsc" : "=A" (rv));
return (rv);
@ -366,7 +366,7 @@ write_eflags(u_int ef)
}
static __inline void
wrmsr(u_int msr, u_int64_t newval)
wrmsr(u_int msr, uint64_t newval)
{
__asm __volatile("wrmsr" : : "A" (newval), "c" (msr));
}
@ -456,6 +456,14 @@ rfs(void)
return (sel);
}
static __inline uint64_t
rgdt(void)
{
uint64_t gdtr;
__asm __volatile("sgdt %0" : "=m" (gdtr));
return (gdtr);
}
static __inline u_int
rgs(void)
{
@ -464,6 +472,22 @@ rgs(void)
return (sel);
}
static __inline uint64_t
ridt(void)
{
uint64_t idtr;
__asm __volatile("sidt %0" : "=m" (idtr));
return (idtr);
}
static __inline u_short
rldt(void)
{
u_short ldtr;
__asm __volatile("sldt %0" : "=g" (ldtr));
return (ldtr);
}
static __inline u_int
rss(void)
{
@ -472,6 +496,14 @@ rss(void)
return (sel);
}
static __inline u_short
rtr(void)
{
u_short tr;
__asm __volatile("str %0" : "=g" (tr));
return (tr);
}
static __inline void
load_fs(u_int sel)
{
@ -677,8 +709,8 @@ u_int rcr0(void);
u_int rcr2(void);
u_int rcr3(void);
u_int rcr4(void);
u_int64_t rdmsr(u_int msr);
u_int64_t rdpmc(u_int pmc);
uint64_t rdmsr(u_int msr);
uint64_t rdpmc(u_int pmc);
u_int rdr0(void);
u_int rdr1(void);
u_int rdr2(void);
@ -687,13 +719,17 @@ u_int rdr4(void);
u_int rdr5(void);
u_int rdr6(void);
u_int rdr7(void);
u_int64_t rdtsc(void);
uint64_t rdtsc(void);
u_int read_eflags(void);
u_int rfs(void);
uint64_t rgdt(void);
u_int rgs(void);
uint64_t ridt(void);
u_short rldt(void);
u_short rtr(void);
void wbinvd(void);
void write_eflags(u_int ef);
void wrmsr(u_int msr, u_int64_t newval);
void wrmsr(u_int msr, uint64_t newval);
#endif /* __GNUCLIKE_ASM && __CC_SUPPORTS___INLINE */