X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=src%2Fruntime%2Fppc-assem.S;h=32ec9123af3bd5c5db5bfe1726dfe418b0199c27;hb=0285aa5ff8416027932daa001b84429be2ca559b;hp=a8a165cd5445754429c8800f66139bffebb10529;hpb=b119de9cf02b07c8af6e74b6e0bc6860a38c93d8;p=sbcl.git

diff --git a/src/runtime/ppc-assem.S b/src/runtime/ppc-assem.S
index a8a165c..32ec912 100644
--- a/src/runtime/ppc-assem.S
+++ b/src/runtime/ppc-assem.S
@@ -605,10 +605,23 @@ CSYMBOL(undefined_tramp):
 	/* Point reg_CODE to the header and tag it as function, since
 	   the debugger regards a function pointer in reg_CODE which
 	   doesn't point to a code object as undefined function.  */
-	bcl 20,31,.+4                  /* get address of the next instruction */
-	mflr reg_CODE                  /* header 1 extra word back from here */
-	addi reg_CODE,reg_CODE,-(SIMPLE_FUN_CODE_OFFSET+4)
-	
+	/* We are given that reg_LIP points to undefined_tramp by
+	   virtue of the calling convention.  */
+	addi reg_CODE,reg_LIP,-SIMPLE_FUN_CODE_OFFSET
+
+	/* If we are called with stack arguments (or in a tail-call
+	   scenario), we end up with an allocated stack frame, but the
+	   frame link information is uninitialized.  Fix things by
+	   allocating and initializing our stack frame "properly". */
+	cmpwi cr0,reg_NARGS,16
+	bt gt,1f
+	addi reg_CSP,reg_CFP,16
+	b 2f
+1:	add reg_CSP,reg_CFP,reg_NARGS
+2:	stw reg_OCFP,0(reg_CFP)
+	stw reg_LRA,4(reg_CFP)
+
+	/* Now that the preliminaries are dealt with, actually trap. */
 	twllei reg_ZERO,trap_Cerror
 	.byte 4
 	.byte UNDEFINED_FUN_ERROR
@@ -663,13 +676,13 @@ CSYMBOL(funcallable_instance_tramp) = . + 1
 	.globl CSYMBOL(fun_end_breakpoint_trap)
 	.globl CSYMBOL(fun_end_breakpoint_end)
 
-	/* Due to pointer verification in MAKE-LISP-OBJ on GENCGC
-	targets, which includes PPC, this must include its header data
-	(the offset from the start of the code-object to the LRA).
-	The code-object header is five words, there are two words of
-	constants, and the instruction space is doubleword-aligned,
-	making an offset of eight.  This is header data for a widetag,
-	so shift left eight bits and add. */
+	/* Due to pointer verification in MAKE-LISP-OBJ, this must
+	include its header data (the offset from the start of the
+	code-object to the LRA).  The code-object header is five
+	words, there are two words of constants, and the instruction
+	space is doubleword-aligned, making an offset of eight.
+	This is header data for a widetag, so shift left eight bits
+	and add. */
 	.long RETURN_PC_HEADER_WIDETAG + 0x800
 
 	/* We are receiving unknown multiple values, thus must deal