scc

commit cc91dc2eb3036c06b19a4388b44302b84fc94787
parent 2ef97adeb24a81cc0fc756c07b43d34644febf0d
Author: zerous Naveen Narayanan <zerous@nocebo.space>
Date:   Sat, 16 Nov 2019 13:43:49 +0100

Update gensys.sh for i386/linux

awk script generates code that sets the respective registers with
parameters for i386 syscalls.
Fix syscalls

Diffstat:
M
src/libc/arch/i386/linux/Makefile
 | 
1
+
M
src/libc/arch/i386/linux/gensys.sh
 | 
52
+++++++++++++++++++++++++++++++++++-----------------
M
src/libc/arch/i386/linux/syscall.lst
 | 
22
+++++++++++-----------

3 files changed, 47 insertions(+), 28 deletions(-)
diff --git a/src/libc/arch/i386/linux/Makefile b/src/libc/arch/i386/linux/Makefile
@@ -16,6 +16,7 @@ OBJS 	=\
 	_Exit.o\
 	_kill.o\
 	crt.o\
+	signal.o\
 
 all: syscall
 	$(MAKE) objs
diff --git a/src/libc/arch/i386/linux/gensys.sh b/src/libc/arch/i386/linux/gensys.sh
@@ -1,20 +1,38 @@
 #!/bin/sh
-#
-# This job is very easy because app and kernel ABI are identical
-# until the 4th parameter, so we only have to set the syscall
-# number in eax
 
-sed 's/[ 	]*#.*//
-     /^$/d' syscall.lst |
-while read num name
-do
-cat <<EOF > $name.s
-	.file	"$name.s"
+awk '
+NR > 1	{syscall=$2
+	fname=$2".s"
+	noper=$3
 
-	.globl	$name
-$name:
-	movl	\$$num,%eax
-	syscall
-	jmp	_cerrno
-EOF
-done
+	printf "\t.file\t"
+	       "\"fname\"\n"
+	       "\t.globl\t%s\n"
+	       "%s:\n"
+	       "\tpushl\t%%ebp\n"
+	       "\tpushl\t%%ebx\n"
+	       "\tpushl\t%%esi\n\n",
+	       "\tpushl\t%%edi\n"
+	       "\tmovl\t%%esp,%%ebp\n"
+	       syscall, syscall > fname
+
+	if (noper > 0)
+		printf "\tmovl\t20(%%ebp),%%ebx\n" >> fname
+	if (noper > 1)
+		printf "\tmovl\t24(%%ebp),%%ecx\n" >> fname
+	if (noper > 2)
+		printf "\tmovl\t28(%%ebp),%%edx\n" >> fname
+	if (noper > 3)
+		printf "\tmovl\t28(%%ebp),%%esi\n" >> fname
+	if (noper > 4)
+		printf "\tmovl\t28(%%ebp),%%edi\n" >> fname
+
+	printf "\tmovl\t$%d,%%eax\n"
+	       "\tint\t$0x80\n"
+	       "\tpopl\t%%edi\n"
+	       "\tpopl\t%%esi\n"
+	       "\tpopl\t%%ebx\n"
+	       "\tpopl\t%%ebp\n"
+	       "\tjmp\t_cerrno\n", $1 >> fname
+
+} ' syscall.lst
diff --git a/src/libc/arch/i386/linux/syscall.lst b/src/libc/arch/i386/linux/syscall.lst
@@ -1,11 +1,11 @@
-#number name
-3	_read
-4	_write
-5	_open
-6	_close
-19	_lseek
-45	_brk
-67	_sigaction
-20	_getpid
-1	_Exit
-37	_kill
+#number	name		num_of_op
+1	_Exit		1
+3	_read		3
+4	_write		3
+5	_open		2
+6	_close		1
+19	_lseek		3
+20	_getpid		0
+37	_kill		2
+45	_brk		1
+67	_sigaction	3