#include "util.h"
#define SYS_write 64
-#define SYS_exit 93
-#define SYS_stats 1234
#undef strcmp
extern volatile uint64_t tohost;
extern volatile uint64_t fromhost;
-static uintptr_t handle_frontend_syscall(uintptr_t which, uint64_t arg0, uint64_t arg1, uint64_t arg2)
+static uintptr_t syscall(uintptr_t which, uint64_t arg0, uint64_t arg1, uint64_t arg2)
{
volatile uint64_t magic_mem[8] __attribute__((aligned(64)));
magic_mem[0] = which;
static uintptr_t counters[NUM_COUNTERS];
static char* counter_names[NUM_COUNTERS];
-static int handle_stats(int enable)
+void setStats(int enable)
{
int i = 0;
#define READ_CTR(name) do { \
READ_CTR(minstret);
#undef READ_CTR
- return 0;
}
void __attribute__((noreturn)) tohost_exit(uintptr_t code)
while (1);
}
-uintptr_t handle_trap(uintptr_t cause, uintptr_t epc, uintptr_t regs[32])
-{
- if (cause != CAUSE_MACHINE_ECALL)
- tohost_exit(1337);
- else if (regs[17] == SYS_exit)
- tohost_exit(regs[10]);
- else if (regs[17] == SYS_stats)
- regs[10] = handle_stats(regs[10]);
- else
- regs[10] = handle_frontend_syscall(regs[17], regs[10], regs[11], regs[12]);
-
- return epc + ((*(unsigned short*)epc & 3) == 3 ? 4 : 2);
-}
-
-static uintptr_t syscall(uintptr_t num, uintptr_t arg0, uintptr_t arg1, uintptr_t arg2)
+uintptr_t __attribute__((weak)) handle_trap(uintptr_t cause, uintptr_t epc, uintptr_t regs[32])
{
- register uintptr_t a7 asm("a7") = num;
- register uintptr_t a0 asm("a0") = arg0;
- register uintptr_t a1 asm("a1") = arg1;
- register uintptr_t a2 asm("a2") = arg2;
- asm volatile ("scall" : "+r"(a0) : "r"(a1), "r"(a2), "r"(a7));
- return a0;
+ tohost_exit(1337);
}
void exit(int code)
{
- syscall(SYS_exit, code, 0, 0);
- while (1);
-}
-
-void setStats(int enable)
-{
- syscall(SYS_stats, enable, 0, 0);
+ tohost_exit(code);
}
void printstr(const char* s)