From afa53b05b003cbd10904ea56621bf2e533b66aaa Mon Sep 17 00:00:00 2001
From: Richard Sandiford <rdsandiford@googlemail.com>
Date: Wed, 8 Jan 2003 12:54:29 +0000
Subject: 	* mips/crt0.S (_start): Allocate 64 bytes of stack instead of
 32. 	Pass an empty argv and envp to main().

---
 libgloss/ChangeLog   |  5 +++++
 libgloss/mips/crt0.S | 26 ++++++++++++++------------
 2 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/libgloss/ChangeLog b/libgloss/ChangeLog
index e325c874d..7c03dfeea 100644
--- a/libgloss/ChangeLog
+++ b/libgloss/ChangeLog
@@ -1,3 +1,8 @@
+2002-01-08  Richard Sandiford  <rsandifo@redhat.com
+
+	* mips/crt0.S (_start): Allocate 64 bytes of stack instead of 32.
+	Pass an empty argv and envp to main().
+
 2002-01-08  Richard Sandiford  <rsandifo@redhat.com
 
 	* mips/configure.in (mips64vr-elf, mips64vrel-elf): New config.
diff --git a/libgloss/mips/crt0.S b/libgloss/mips/crt0.S
index d8d78eddf..acb160df0 100644
--- a/libgloss/mips/crt0.S
+++ b/libgloss/mips/crt0.S
@@ -157,16 +157,10 @@ zerobss:
 	lw	t0,0(a0)			# last address of memory available
 	la	t1,K0BASE			# cached kernel memory
 	addu	t0,t0,t1			# get the end of memory address
-	/* We must subtract 24 bytes for the 3 8 byte arguments to main, in
-	   case main wants to write them back to the stack.  The caller is
-	   supposed to allocate stack space for parameters in registers in
-	   the old MIPS ABIs.  We must do this even though we aren't passing
-	   arguments, because main might be declared to have them.
-
-	   Some ports need a larger alignment for the stack, so we subtract
-	   32, which satisifes the stack for the arguments and keeps the
-	   stack pointer better aligned.  */
-	subu	t0,t0,32			# and generate a starting stack-pointer
+	/* Allocate 32 bytes for the register parameters.  Allocate 16
+	   bytes for a null argv and envp.  Round the result up to 64
+	   bytes to preserve alignment.  */
+	subu	t0,t0,64
 4:
 	move	sp,t0				# set stack pointer
 	sw	sp,__stackbase			# keep this for future ref
@@ -213,9 +207,17 @@ init:
 	jal	_init				# run global constructors
 	nop
 
-	move	a0,zero				# set argc to 0
+	addiu	a1,sp,32			# argv = sp + 32
+	addiu	a2,sp,40			# envp = sp + 40
+#if __mips64
+	sd	zero,(a1)			# argv[argc] = 0
+	sd	zero,(a2)			# envp[0] = 0
+#else
+	sw	zero,(a1)
+	sw	zero,(a2)
+#endif
 	jal	main				# call the program start function
-	nop
+	move	a0,zero				# set argc to 0
 
 	# fall through to the "exit" routine
 	jal	exit				# call libc exit to run the G++
-- 
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