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#include "pcr.h"
#include "pk.h"
#include "file.h"
#include "frontend.h"
#include <stdarg.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
static void vsprintk(char* out, const char* s, va_list vl)
{
bool format = false;
bool longarg = false;
for( ; *s; s++)
{
if(format)
{
switch(*s)
{
case 'l':
longarg = true;
break;
case 'x':
{
long n = longarg ? va_arg(vl,long) : va_arg(vl,int);
for(int i = 2*(longarg ? sizeof(long) : sizeof(int))-1; i >= 0; i--)
{
int d = (n >> (4*i)) & 0xF;
*out++ = (d < 10 ? '0'+d : 'a'+d-10);
}
longarg = false;
format = false;
break;
}
case 'd':
{
long n = longarg ? va_arg(vl,long) : va_arg(vl,int);
if(n < 0)
{
n = -n;
*out++ = '-';
}
long digits = 1;
for(long nn = n ; nn /= 10; digits++);
for(int i = digits-1; i >= 0; i--)
{
out[i] = '0' + n%10;
n /= 10;
}
out += digits;
longarg = false;
format = false;
break;
}
case 's':
{
const char* s2 = va_arg(vl,const char*);
while(*s2)
*out++ = *s2++;
longarg = false;
format = false;
break;
}
case 'c':
{
*out++ = (char)va_arg(vl,int);
longarg = false;
format = false;
break;
}
default:
panic("bad fmt");
}
}
else if(*s == '%')
format = true;
else
*out++ = *s;
}
*out++ = '\0';
}
void printk(const char* s, ...)
{
va_list vl;
va_start(vl,s);
char out[1024]; // XXX
vsprintk(out,s,vl);
file_write(stderr,out,strlen(out));
va_end(vl);
}
void sprintk(char* out, const char* s, ...)
{
va_list vl;
va_start(vl,s);
vsprintk(out,s,vl);
va_end(vl);
}
void dump_tf(trapframe_t* tf)
{
static const char* regnames[] = {
"z ", "ra", "v0", "v1", "a0", "a1", "a2", "a3",
"a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3",
"t4", "t5", "t6", "t7", "s0", "s1", "s2", "s3",
"s4", "s5", "s6", "s7", "s8", "fp", "sp", "tp"
};
tf->gpr[0] = 0;
for(int i = 0; i < 32; i+=4)
{
for(int j = 0; j < 4; j++)
printk("%s %lx%c",regnames[i+j],tf->gpr[i+j],j < 3 ? ' ' : '\n');
}
printk("sr %lx pc %lx va %lx insn %x\n",tf->sr,tf->epc,tf->badvaddr,
(uint32_t)tf->insn);
}
void init_tf(trapframe_t* tf, long pc, long sp, int user64)
{
memset(tf,0,sizeof(*tf));
if(sizeof(void*) != 8)
kassert(!user64);
tf->sr = (mfpcr(PCR_SR) & (SR_IM | SR_S64)) | SR_S | SR_EC;
if(user64)
tf->sr |= SR_U64;
tf->gpr[30] = sp;
tf->epc = pc;
}
static void bss_init()
{
// front-end server zeroes the bss automagically
}
struct args
{
uint64_t argc;
uint64_t argv[];
};
static struct args* mainvars_init(long loc)
{
sysret_t r = frontend_syscall(SYS_getmainvars, loc, USER_MAINVARS_SIZE, 0, 0);
kassert(r.result == 0);
return (struct args*)loc;
}
static void jump_usrstart(const char* fn, long sp)
{
trapframe_t tf;
int user64;
long start = load_elf(fn, &user64);
asm volatile("cflush; fence");
init_tf(&tf, start, sp, user64);
pop_tf(&tf);
}
uint32_t mem_mb;
void boot()
{
bss_init();
file_init();
// word 0 of memory contains # of MB of memory
mem_mb = *(uint32_t*)0;
unsigned long stack_top = 0x80000000;
if (mem_mb < stack_top / (1024 * 1024))
stack_top = mem_mb * (1024 * 1024);
stack_top -= USER_MAINVARS_SIZE;
struct args* args = mainvars_init(stack_top);
jump_usrstart((char*)(long)args->argv[0], stack_top);
}
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