From: Avi Kivity <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
diff --git a/Makefile b/Makefile
index 456ceae..5347ce8 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ cflatobjs := \
lib/panic.o \
lib/printf.o \
lib/string.o
+cflatobjs += lib/argv.o
#include architecure specific make rules
include config-$(ARCH).mak
diff --git a/lib/argv.c b/lib/argv.c
new file mode 100644
index 0000000..4ee54a6
--- /dev/null
+++ b/lib/argv.c
@@ -0,0 +1,33 @@
+#include "libcflat.h"
+
+int __argc;
+char *__argv[100];
+char *__args;
+char __args_copy[1000];
+
+static bool isblank(char p)
+{
+ return p == ' ' || p == '\t';
+}
+
+static char *skip_blanks(char *p)
+{
+ while (isblank(*p))
+ ++p;
+ return p;
+}
+
+void __setup_args(void)
+{
+ char *args = __args;
+ char **argv = __argv;
+ char *p = __args_copy;
+
+ while (*(args = skip_blanks(args)) != '\0') {
+ *argv++ = p;
+ while (*args != '\0' && !isblank(*args))
+ *p++ = *args++;
+ *p++ = '\0';
+ }
+ __argc = argv - __argv;
+}
diff --git a/x86/cstart.S b/x86/cstart.S
index 0471b92..1bdf789 100644
--- a/x86/cstart.S
+++ b/x86/cstart.S
@@ -9,9 +9,15 @@ mb_flags = 0x0
# multiboot header
.long mb_magic, mb_flags, 0 - (mb_magic + mb_flags)
+mb_cmdline = 16
.globl start
start:
+ mov mb_cmdline(%ebx), %eax
+ mov %eax, __args
+ call __setup_args
+ pushl $__argv
+ pushl __argc
call main
push %eax
call exit
diff --git a/x86/cstart64.S b/x86/cstart64.S
index 46e9d5c..cc4c80f 100644
--- a/x86/cstart64.S
+++ b/x86/cstart64.S
@@ -75,6 +75,8 @@ i = i + 1
.endr
tss_end:
+mb_boot_info: .quad 0
+
.section .init
.code32
@@ -84,6 +86,7 @@ mb_flags = 0x0
# multiboot header
.long mb_magic, mb_flags, 0 - (mb_magic + mb_flags)
+mb_cmdline = 16
MSR_GS_BASE = 0xc0000101
@@ -96,6 +99,7 @@ MSR_GS_BASE = 0xc0000101
.globl start
start:
+ mov %ebx, mb_boot_info
mov $stacktop, %esp
setup_percpu_area
call prepare_64
@@ -179,6 +183,12 @@ start64:
call enable_apic
call smp_init
call enable_x2apic
+ mov mb_boot_info(%rip), %rax
+ mov mb_cmdline(%rax), %rax
+ mov %rax, __args(%rip)
+ call __setup_args
+ mov __argc(%rip), %edi
+ lea __argv(%rip), %rsi
call main
mov %eax, %edi
call exit
--
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