Rename *.S to *.asm to support case-insensitive filesystems

Allow building on case-insensitive filesystems by avoiding the *.S/*.s
distinction.

1 files changed, 191 insertions, 0 deletions

diff --git a/printmsg.asm b/printmsg.asm
new file mode 100644
index 0000000..4293877
--- /dev/null
+++ b/printmsg.asm
@@ -0,0 +1,191 @@
+/* -*- asm -*- ----------------------------------------------------------- *
+ *   
+ *   Copyright 2013 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *   
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *   
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+#include "v9fs.h"
+
+	.code16
+	.section ".text","ax"
+
+/* ------------------------------------------------------------------------- *
+ *  puterr
+ *
+ *  Print a message (pointer on the stack) on standard error, prefixed by
+ *  "v9fs: "
+ * ------------------------------------------------------------------------- */
+	.globl puterr
+puterr:
+	printmsg "v9fs: "
+	/* Fall through */
+	.size puterr,.-puterr
+	.type puterr,@function
+
+/* ------------------------------------------------------------------------- *
+ *  puts
+ *
+ *  Print a message (pointer on the stack) on standard error.
+ * ------------------------------------------------------------------------- */
+	.globl puts
+puts:
+	pushaw
+	movw %sp,%bp
+	movw 18(%bp),%di
+	movw %di,%dx
+	xorb %al,%al
+	movw %di,%cx
+	notw %cx
+	cld
+	repne scasb
+	/* Now %di points to the byte *after* the terminating null */
+	leaw -1(%di),%cx
+	subw %dx,%cx
+	movw $2,%bx		/* 2 = stderr */
+	movb $0x40,%ah
+1:
+	jcxz 2f
+	int $0x21
+	jc 2f
+	subw %ax,%cx
+	jmp 1b
+2:
+	popaw
+	retw $2
+
+	.size puts,.-puts
+	.type puts,@function
+
+/* ------------------------------------------------------------------------- *
+ *  printnum
+ *
+ *  Print an unsigned 32-bit integer on the stack
+ * ------------------------------------------------------------------------- */
+	.globl printnum
+printnum:
+	pushl %eax
+	pushl %edx
+	pushl %ecx
+	pushw %di
+	movw %sp,%di
+	movl (2+1*2+3*4)(%di),%eax
+	subw $12,%sp
+	decw %di
+	xorl %ecx,%ecx
+	movb %cl,(%di)
+	movb $10,%cl
+1:
+	xorl %edx,%edx
+	divl %ecx
+	decw %di
+	addb $0x30,%dl
+	movb %dl,(%di)
+	andl %eax,%eax
+	jnz 1b
+
+	pushw %di
+	call puts
+
+	addw $12,%sp
+	popw %di
+	popl %ecx
+	popl %edx
+	popl %eax
+	retw $4
+
+	.size printnum,.-printnum
+	.type printnum,@function
+
+/* ------------------------------------------------------------------------- *
+ *  printhex4
+ *
+ *  Print an hexadecimal 4-digit number from the stack
+ * ------------------------------------------------------------------------- */
+	.globl printhex4
+printhex4:
+	pushw %ax
+	pushw %cx
+	pushw %dx
+	pushw %di
+	cld
+	subw $6,%sp
+	movw %sp,%di
+	movw (2+4*2+6)(%di),%dx
+	movw $4,%cx
+1:
+	rolw $4,%dx
+	movb %dl,%al
+	andb $0x0f,%al
+	addb $0x30,%al
+	cmpb $0x3a,%al
+	jb 2f
+	addb $(0x41-0x3a),%al
+2:
+	stosb
+	loopw 1b
+	movb %cl,(%di)		/* %cl == 0 */
+	pushw %sp		/* %sp -> address of buffer */
+	call puts
+
+	addw $6,%sp
+	popw %di
+	popw %dx
+	popw %cx
+	popw %ax
+	retw $2
+
+	.size printhex4,.-printhex4
+	.type printhex4,@function
+
+/* ------------------------------------------------------------------------- *
+ *  printhex8
+ *
+ *  Print an hexadecimal 8-digit number from the stack
+ * ------------------------------------------------------------------------- */
+	.globl printhex8
+printhex8:
+	pushw %bp
+	movw %sp,%bp
+	pushw 6(%bp)
+	call printhex4
+	pushw 4(%bp)
+	call printhex4
+	popw %bp
+	retw $4
+
+	.size printhex8,.-printhex8
+	.type printhex8,@function
+
+/* ------------------------------------------------------------------------- *
+ *  crlf
+ *
+ *  Print a newline
+ * ------------------------------------------------------------------------- */
+	.globl crlf
+crlf:
+	printmsg "\r\n"
+	retw
+
+	.size crlf,.-crlf
+	.type crlf,@function