Allow "ddb{1}> trace" through interrupt on macppc

If cpu0 sends PPC_IPI_DDB to cpu1, then cpu1 stops on its interrupt
stack.  Teach ININTSTK to allow traces through all interrupt stacks,
not only cpu0's.

ININTSTK now works by looping for all cpus.  It doesn't remember which
cpu owns the stack.  A macppc has at most 4 cpus.

ok kettenis@ miod@

diff --git a/sys/arch/powerpc/ddb/db_trace.c b/sys/arch/powerpc/ddb/db_trace.c
index 82913cb..e9351e9 100644 (file)
--- a/sys/arch/powerpc/ddb/db_trace.c
+++ b/sys/arch/powerpc/ddb/db_trace.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: db_trace.c,v 1.18 2022/01/28 18:37:40 gkoehler Exp $  */
+/*     $OpenBSD: db_trace.c,v 1.19 2022/02/07 22:28:15 gkoehler Exp $  */
 /*     $NetBSD: db_trace.c,v 1.15 1996/02/22 23:23:41 gwr Exp $        */
 
 /*
@@ -104,14 +104,27 @@ db_save_regs(struct trapframe *frame)
 
 /* from locore.S */
 extern vaddr_t trapexit;
-extern vaddr_t esym;
 #define        INTSTK          (8*1024)        /* 8K interrupt stack */
 
 #define        INKERNEL(va)    (((vaddr_t)(va)) >= VM_MIN_KERNEL_ADDRESS &&    \
                        ((vaddr_t)(va)) < VM_MAX_KERNEL_ADDRESS)
 
-#define        ININTSTK(va)    (((vaddr_t)(va)) >= round_page(esym) &&         \
-                       ((vaddr_t)(va)) < (round_page(esym) + INTSTK))
+#define        ININTSTK(va)    db_in_interrupt_stack((vaddr_t)(va))
+
+int
+db_in_interrupt_stack(vaddr_t va)
+{
+       struct cpu_info *ci;
+       CPU_INFO_ITERATOR cii;
+       vaddr_t stack;
+
+       CPU_INFO_FOREACH(cii, ci) {
+               stack = (vaddr_t)ci->ci_intstk;
+               if (va >= stack - INTSTK && va < stack)
+                       return 1;
+       }
+       return 0;
+}
 
 /*
  *     Frame tracing.