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635cf99a80f4ebee59d70eb64bb85ce829e4591f
linux/arch/i386/kernel
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Chuck Ebbert 635cf99a80 [PATCH] i386: fix singlestep through an int80 syscall 
Using PTRACE_SINGLESTEP on a child that does an int80 syscall misses the
SIGTRAP that should be delivered upon syscall exit.  Fix that by setting
TIF_SINGLESTEP when entering the kernel via int80 with TF set.

/* Test whether singlestep through an int80 syscall works.
 */
#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <asm/user.h>

static int child, status;
static struct user_regs_struct regs;

static void do_child()
{
	ptrace(PTRACE_TRACEME, 0, 0, 0);
	kill(getpid(), SIGUSR1);
	asm ("int $0x80" : : "a" (20)); /* getpid */
}

static void do_parent()
{
	unsigned long eip, expected = 0;
again:
	waitpid(child, &status, 0);
	if (WIFEXITED(status) || WIFSIGNALED(status))
		return;

	if (WIFSTOPPED(status)) {
		ptrace(PTRACE_GETREGS, child, 0, &regs);
		eip = regs.eip;
		if (expected)
			fprintf(stderr, "child stop @ %08x, expected %08x %s\n",
					eip, expected,
					eip == expected ? "" : " <== ERROR");

		if (*(unsigned short *)eip == 0x80cd) {
			fprintf(stderr, "int 0x80 at %08x\n", (unsigned int)eip);
			expected = eip + 2;
		} else
			expected = 0;

		ptrace(PTRACE_SINGLESTEP, child, NULL, NULL);
	}
	goto again;
}

int main(int argc, char * const argv[])
{
	child = fork();
	if (child)
		do_parent();
	else
		do_child();
	return 0;
}

Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-23 07:38:05 -08:00
..
acpi
[PATCH] i386: port ATI timer fix from x86_64 to i386 II
2006-03-08 18:10:31 -08:00
cpu
[PATCH] i386: fall back to sensible CPU model name
2006-03-23 07:38:04 -08:00
timers
[PATCH] x86: mark cyc2ns_scale readmostly
2006-03-22 07:53:55 -08:00
.gitignore
[PATCH] x86: gitignore some autogenerated files for i386
2006-02-14 16:09:35 -08:00
alternative.c
[PATCH] x86: SMP alternatives
2006-03-23 07:38:04 -08:00
apic.c
[PATCH] Plug kdump shutdown race window
2006-03-14 08:26:44 -08:00
apm.c
[PATCH] capable/capability.h (arch/)
2006-01-11 18:42:14 -08:00
asm-offsets.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
bootflag.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
cpuid.c
[PATCH] arch/i386/kernel/cpuid.c: unused variable
2006-01-06 08:33:38 -08:00
crash_dump.c
[PATCH] kdump: read previous kernel's memory
2006-01-10 08:01:28 -08:00
crash.c
[PATCH] i386: fix uses of user_mode() vs. user_mode_vm()
2006-03-23 07:38:05 -08:00
dmi_scan.c
[PATCH] x86_64: Generalize DMI and enable for x86-64
2006-01-11 19:04:51 -08:00
doublefault.c
[PATCH] i386: inline assembler: cleanup and encapsulate descriptor and task register management
2005-09-05 00:06:11 -07:00
early_printk.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
efi_stub.S
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
efi.c
[PATCH] efi_call_phys_epilog() warning fix
2006-03-22 07:53:55 -08:00
entry.S
[PATCH] i386: fix singlestep through an int80 syscall
2006-03-23 07:38:05 -08:00
head.S
[PATCH] x86: fix broken SMP boot sequence
2006-02-24 14:31:38 -08:00
i386_ksyms.c
[PATCH] x86: fix broken SMP boot sequence
2006-02-24 14:31:38 -08:00
i387.c
x86: make restore_fpu() use alternative assembler instructions
2005-07-22 16:06:16 -04:00
i8237.c
[PATCH] ISA DMA suspend for i386
2005-09-05 00:06:14 -07:00
i8259.c
Revert "i386: move apic init in init_IRQs"
2005-10-31 19:16:17 -08:00
init_task.c
[PATCH] Change maxaligned_in_smp alignemnt macros to internodealigned_in_smp macros
2006-01-08 20:13:38 -08:00
io_apic.c
[PATCH] i386: port ATI timer fix from x86_64 to i386 II
2006-03-08 18:10:31 -08:00
ioport.c
[PATCH] capable/capability.h (arch/)
2006-01-11 18:42:14 -08:00
irq.c
[PATCH] Change maxaligned_in_smp alignemnt macros to internodealigned_in_smp macros
2006-01-08 20:13:38 -08:00
kprobes.c
[PATCH] Kprobes causes NX protection fault on i686 SMP
2006-02-24 14:31:37 -08:00
ldt.c
[PATCH] arch/i386/kernel/ldt.c should #include <asm/mmu_context.h>
2005-11-07 07:53:29 -08:00
machine_kexec.c
[PATCH] fix kexec asm
2006-03-08 14:15:04 -08:00
Makefile
[PATCH] x86: SMP alternatives
2006-03-23 07:38:04 -08:00
mca.c
[PATCH] arch/i386: Use ARRAY_SIZE macro
2005-11-07 07:53:28 -08:00
microcode.c
[PATCH] x86 microcode driver vs hotplug CPUs.
2006-02-28 20:53:43 -08:00
module.c
[PATCH] x86: SMP alternatives
2006-03-23 07:38:04 -08:00
mpparse.c
[PATCH] Compilation fix for ES7000 when no ACPI is specified in config (i386)
2006-03-23 07:38:04 -08:00
msr.c
[PATCH] arch/i386/kernel/msr.c: removed unused variable
2006-01-06 08:33:38 -08:00
nmi.c
[PATCH] x86: Fix i386 nmi_watchdog that does not trigger die_nmi
2006-03-08 14:14:01 -08:00
numaq.c
[PATCH] re-disable TSC on NUMAQ
2005-07-28 21:46:05 -07:00
pci-dma.c
[PATCH] gfp flags annotations - part 1
2005-10-08 15:00:57 -07:00
process.c
[PATCH] i386: fix uses of user_mode() vs. user_mode_vm()
2006-03-23 07:38:05 -08:00
ptrace.c
[PATCH] i386: Don't let ptrace set the nested task bit
2006-03-23 07:38:04 -08:00
quirks.c
[PATCH] EDAC: core EDAC support code
2006-01-18 19:20:31 -08:00
reboot_fixups.c
[PATCH] arch/i386/kernel/reboot_fixups.c should #include <linux/reboot_fixups.h>
2005-11-07 07:53:29 -08:00
reboot.c
[PATCH] i386/x86-64: Don't IPI to offline cpus on shutdown
2006-01-11 19:04:50 -08:00
relocate_kernel.S
[PATCH] kexec: x86 kexec core
2005-06-25 16:24:49 -07:00
scx200.c
[PATCH] arch: Replace pci_module_init() with pci_register_driver()
2006-01-09 12:13:21 -08:00
semaphore.c
[PATCH] x86: SMP alternatives
2006-03-23 07:38:04 -08:00
setup.c
[PATCH] x86: early printk handling fixes
2006-03-23 07:38:05 -08:00
sigframe.h
[PATCH] __user annotations for pointers in i386 sigframe
2005-09-09 10:31:59 -07:00
signal.c
[PATCH] i386: let signal handlers set the resume flag
2006-03-23 07:38:05 -08:00
smp.c
[PATCH] on_each_cpu(): disable local interrupts
2006-03-22 07:53:59 -08:00
smpboot.c
[PATCH] x86: SMP alternatives
2006-03-23 07:38:04 -08:00
srat.c
[PATCH] x86_64: Make i386 compile again with fourth DMA32 zone
2005-11-14 19:55:13 -08:00
summit.c
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
sys_i386.c
[PATCH] Uninline sys_mmap common code (reduce binary size)
2006-03-22 07:54:02 -08:00
syscall_table.S
[PATCH] fstatat64 support
2006-02-11 21:41:10 -08:00
sysenter.c
[PATCH] sep initializing rework
2005-06-25 16:24:29 -07:00
time_hpet.c
[PATCH] move rtc_interrupt() prototype to rtc.h
2006-01-08 20:13:47 -08:00
time.c
[PATCH] x86: fix potential jiffies overflow in timer_resume()
2006-03-06 18:40:44 -08:00
topology.c
[PATCH] Fix topology.c location
2006-02-24 14:31:39 -08:00
trampoline.S
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
traps.c
[PATCH] i386: fix uses of user_mode() vs. user_mode_vm()
2006-03-23 07:38:05 -08:00
vm86.c
correct email address of Manfred Spraul
2006-01-15 02:43:54 +01:00
vmlinux.lds.S
[PATCH] x86: SMP alternatives
2006-03-23 07:38:04 -08:00
vsyscall-int80.S
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00
vsyscall-note.S
[PATCH] i386 vDSO: add PT_NOTE segment
2005-04-16 15:24:48 -07:00
vsyscall-sigreturn.S
kbuild: full dependency check on asm-offsets.h
2005-09-09 19:28:28 +02:00
vsyscall-sysenter.S
[PATCH] x86: document sysenter path
2006-02-14 16:09:35 -08:00
vsyscall.lds.S
kbuild: full dependency check on asm-offsets.h
2005-09-09 19:28:28 +02:00
vsyscall.S
Linux-2.6.12-rc2
2005-04-16 15:20:36 -07:00