^T to print out stack traces

4e81358f · Nickolai Zeldovich · 227f0486 · 4e81358f · 4e81358f
--- a/console.c
+++ b/console.c
@@ -239,6 +239,10 @@ consoleintr(int (*getc)(void))
      for (u32 i = 0; i < NCPU; i++)
        cpus[i].timer_printpc = 1;
      break;
+    case C('T'):  // Print user-space PCs and stack traces.
+      for (u32 i = 0; i < NCPU; i++)
+        cpus[i].timer_printpc = 2;
+      break;
    case C('U'):  // Kill line.
      while(input.e != input.w &&
            input.buf[(input.e-1) % INPUT_BUF] != '\n'){

--- a/trap.c
+++ b/trap.c
@@ -76,6 +76,12 @@ trap(struct trapframe *tf)
              mycpu()->id,
              myproc() ? myproc()->name : "(none)",
              tf->rip, tf->rsp, tf->cs);
+      if (mycpu()->timer_printpc == 2 && tf->rbp > KBASE) {
+        uptr pc[10];
+        getcallerpcs((void *) tf->rbp, pc, NELEM(pc));
+        for (int i = 0; i < 10 && pc[i]; i++)
+          cprintf("cpu%d:   %lx\n", mycpu()->id, pc[i]);
+      }
      mycpu()->timer_printpc = 0;
    }
    if (mycpu()->id == 0)