x86: Make Alt-SysRq-p display the debug register contents

This patch (as921) adds code to the show_regs() routine in i386 and x86_64
to print the contents of the debug registers along with all the others.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 6c49acb9698210849ed6e74090717c7499a21562..84664710b78442d1bad1dd220c6de6f9d0033a63 100644 (file)
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -300,6 +300,7 @@ early_param("idle", idle_setup);
 void show_regs(struct pt_regs * regs)
 {
        unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
+       unsigned long d0, d1, d2, d3, d6, d7;
 
        printk("\n");
        printk("Pid: %d, comm: %20s\n", current->pid, current->comm);
@@ -324,6 +325,17 @@ void show_regs(struct pt_regs * regs)
        cr3 = read_cr3();
        cr4 = read_cr4_safe();
        printk("CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n", cr0, cr2, cr3, cr4);
+
+       get_debugreg(d0, 0);
+       get_debugreg(d1, 1);
+       get_debugreg(d2, 2);
+       get_debugreg(d3, 3);
+       printk("DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
+                       d0, d1, d2, d3);
+       get_debugreg(d6, 6);
+       get_debugreg(d7, 7);
+       printk("DR6: %08lx DR7: %08lx\n", d6, d7);
+
        show_trace(NULL, regs, &regs->esp);
 }
 

diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c
index 180f4c0fcbc4125690cee81a991f24360487e695..bbfc957f045f6f1c9de33fc73b6f913681261e2e 100644 (file)
--- a/arch/x86_64/kernel/process.c
+++ b/arch/x86_64/kernel/process.c
@@ -306,6 +306,7 @@ early_param("idle", idle_setup);
 void __show_regs(struct pt_regs * regs)
 {
        unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L, fs, gs, shadowgs;
+       unsigned long d0, d1, d2, d3, d6, d7;
        unsigned int fsindex,gsindex;
        unsigned int ds,cs,es; 
 
@@ -350,6 +351,15 @@ void __show_regs(struct pt_regs * regs)
               fs,fsindex,gs,gsindex,shadowgs); 
        printk("CS:  %04x DS: %04x ES: %04x CR0: %016lx\n", cs, ds, es, cr0); 
        printk("CR2: %016lx CR3: %016lx CR4: %016lx\n", cr2, cr3, cr4);
+
+       get_debugreg(d0, 0);
+       get_debugreg(d1, 1);
+       get_debugreg(d2, 2);
+       printk("DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2);
+       get_debugreg(d3, 3);
+       get_debugreg(d6, 6);
+       get_debugreg(d7, 7);
+       printk("DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7);
 }
 
 void show_regs(struct pt_regs *regs)