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Register an interrupt vector for DTrace return probes. There is some

Browse source 
code missing in lapic to make sure that we don't overwrite this entry,
but this will be done on a sequent commit.

Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Rui Paulo 2010-08-28 08:03:29 +00:00
parent 97f047a80b
commit cba3269417
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=211924
6 changed files with 25 additions and 1 deletions
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4
sys/amd64/amd64/exception.S
View file

@ -108,6 +108,10 @@ IDTVEC(dbg)
TRAP_NOEN(T_TRCTRAP)
IDTVEC(bpt)
TRAP_NOEN(T_BPTFLT)
#ifdef KDTRACE_HOOKS
IDTVEC(dtrace_ret)
TRAP_NOEN(T_DTRACE_RET)
#endif
/* Regular traps; The cpu does not supply tf_err for these. */
#define TRAP(a) \

7
sys/amd64/amd64/machdep.c
View file

@ -54,6 +54,7 @@ __FBSDID("$FreeBSD$");
#include "opt_msgbuf.h"
#include "opt_perfmon.h"
#include "opt_sched.h"
#include "opt_kdtrace.h"
#include <sys/param.h>
#include <sys/proc.h>
@ -1089,6 +1090,9 @@ extern inthand_t
IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
IDTVEC(xmm), IDTVEC(dblfault),
#ifdef KDTRACE_HOOKS
IDTVEC(dtrace_ret),
#endif
IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
#ifdef DDB
@ -1617,6 +1621,9 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0);
setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0);
setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0);
#ifdef KDTRACE_HOOKS
setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYSIGT, SEL_UPL, 0);
#endif
r_idt.rd_limit = sizeof(idt0) - 1;
r_idt.rd_base = (long) idt;

1
sys/amd64/include/segments.h
View file

@ -214,6 +214,7 @@ struct region_descriptor {
#define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */
#define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */
#define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */
#define IDT_DTRACE_RET 0x92 /* DTrace pid provider Interrupt Vector */
/*
* Entries in the Global Descriptor Table (GDT)

2
sys/i386/i386/exception.s
View file

@ -108,6 +108,8 @@ IDTVEC(nmi)
pushl $0; TRAP(T_NMI)
IDTVEC(bpt)
pushl $0; TRAP(T_BPTFLT)
IDTVEC(dtrace_ret)
pushl $0; TRAP(T_DTRACE_RET)
IDTVEC(ofl)
pushl $0; TRAP(T_OFLOW)
IDTVEC(bnd)

11
sys/i386/i386/machdep.c
View file

@ -54,6 +54,7 @@ __FBSDID("$FreeBSD$");
#include "opt_npx.h"
#include "opt_perfmon.h"
#include "opt_xbox.h"
#include "opt_kdtrace.h"
#include <sys/param.h>
#include <sys/proc.h>
@ -1876,7 +1877,11 @@ extern inthand_t
IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall);
IDTVEC(xmm),
#ifdef KDTRACE_HOOKS
IDTVEC(dtrace_ret),
#endif
IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall);
#ifdef DDB
/*
@ -2825,6 +2830,10 @@ init386(first)
GSEL(GCODE_SEL, SEL_KPL));
setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL,
GSEL(GCODE_SEL, SEL_KPL));
#ifdef KDTRACE_HOOKS
setidt(IDT_DTRACE_RET, &IDTVEC(dtrace_ret), SDT_SYS386TGT, SEL_UPL,
GSEL(GCODE_SEL, SEL_KPL));
#endif
r_idt.rd_limit = sizeof(idt0) - 1;
r_idt.rd_base = (int) idt;

1
sys/i386/include/segments.h
View file

@ -207,6 +207,7 @@ struct region_descriptor {
#define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */
#define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */
#define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */
#define IDT_DTRACE_RET 0x92 /* DTrace pid provider Interrupt Vector */
/*
* Entries in the Global Descriptor Table (GDT)