From: Jim Kingdon <jkingdon@engr.sgi.com>
Date: Thu, 23 Sep 1993 19:03:38 +0000 (+0000)
Subject: 	* mips-tdep.c (mips_frame_chain): If frame size zero, return zero.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3f528883aef905c53a418716d7b3230d66a65440;p=binutils-gdb.git

	* mips-tdep.c (mips_frame_chain): If frame size zero, return zero.
	* rs6000-tdep.c: Add comment about framelessness.
---

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6461cd53451..3bc857bfe87 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -47,6 +47,7 @@ Wed Sep 22 10:28:06 1993  Jim Kingdon  (kingdon@lioth.cygnus.com)
 	retval.step_resume.
 
 	* mips-tdep.c (mips_frame_chain): If frame size zero, return zero.
+	* rs6000-tdep.c: Add comment about framelessness.
 
 	* remote-nindy.c: Declare ninMemGet and ninMemPut.
 
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index f9193ea288c..82371aaecc3 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -346,7 +346,13 @@ mips_frame_chain(frame)
        of stack (or otherwise hosed).  If we don't check frame size,
        we loop forever if we see a zero size frame.  */
     if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
-	&& PROC_FRAME_OFFSET (proc_desc) == 0)
+	&& PROC_FRAME_OFFSET (proc_desc) == 0
+	/* Frameless functions, which can happen on the innermost frame
+	   or a frame which was innermost when a signal happened, can
+	   have frame size zero.  No need to check for non-frameless
+	   functions in these situations, though (I don't think).  */
+	&& frame->next != NULL
+	&& !frame->next->signal_handler_caller)
       return 0;
     else
       return read_next_frame_reg(frame, PROC_FRAME_REG(proc_desc))
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 3198fc6b604..012f53b37b6 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -949,6 +949,8 @@ int pcsaved;
 
   if (fi->next != NULL)
     /* Don't even think about framelessness except on the innermost frame.  */
+    /* FIXME: Can also be frameless if fi->next->signal_handler_caller (if
+       a signal happens while executing in a frameless function).  */
     return 0;
   
   func_start = get_pc_function_start (fi->pc) + FUNCTION_START_OFFSET;