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Variadic function demo

This commit is contained in:
Sebastien Bourdeauducq 2014-07-06 21:06:53 +02:00
parent 5a3fa5dbff
commit a03a60b90e
2 changed files with 13 additions and 5 deletions
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2
examples/coredev_test.py
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@ -16,7 +16,7 @@ class CompilerTest(Experiment):
prime = 0
d = d + 1
if prime == 1:
syscall("print_int", x)
syscall("rpc", 42, x)
x = x + 1
self.led.set(0)

16
soc/runtime/main.c
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@ -1,6 +1,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <irq.h>
#include <uart.h>
@ -55,9 +56,17 @@ static int download_kernel(void *buffer, int maxlength)
return length;
}
static void print_int(int x)
static int rpc(int rpc_num, int n_args, ...)
{
printf("%d\n", x);
printf("rpc_num=%d n_args=%d\n", rpc_num, n_args);
va_list args;
va_start(args, n_args);
while(n_args--)
printf("%d\n", va_arg(args, int));
va_end(args);
return 1;
}
static void gpio_set(int channel, int level)
@ -66,7 +75,7 @@ static void gpio_set(int channel, int level)
}
static const struct symbol syscalls[] = {
{"__syscall_print_int", print_int},
{"__syscall_rpc", rpc},
{"__syscall_gpio_set", gpio_set},
{NULL, NULL}
};
@ -78,7 +87,6 @@ int main(void)
unsigned char kbuf[256*1024];
unsigned char kcode[256*1024];
kernel_function k = (kernel_function)kcode;
int i;
int length;
irq_setmask(0);