diff options
| -rw-r--r-- | benchmarks/common/crt.S | 1 | ||||
| -rw-r--r-- | benchmarks/common/syscalls.c | 39 |
2 files changed, 13 insertions, 27 deletions
diff --git a/benchmarks/common/crt.S b/benchmarks/common/crt.S index 2dda05b..ea07099 100644 --- a/benchmarks/common/crt.S +++ b/benchmarks/common/crt.S @@ -129,6 +129,7 @@ _start: j _init + .align 2 trap_entry: addi sp, sp, -272 diff --git a/benchmarks/common/syscalls.c b/benchmarks/common/syscalls.c index 316f2fe..ea264ba 100644 --- a/benchmarks/common/syscalls.c +++ b/benchmarks/common/syscalls.c @@ -32,35 +32,28 @@ static long handle_frontend_syscall(long which, long arg0, long arg1, long arg2) return magic_mem[0]; } -// In setStats, we might trap reading uarch-specific counters. -// The trap handler will skip over the instruction and write 0, -// but only if a0 is the destination register. -#define read_csr_safe(reg) ({ register long __tmp asm("a0"); \ - asm volatile ("csrr %0, " #reg : "=r"(__tmp)); \ - __tmp; }) - -#define NUM_COUNTERS 18 +#define NUM_COUNTERS 2 static long counters[NUM_COUNTERS]; static char* counter_names[NUM_COUNTERS]; + static int handle_stats(int enable) { int i = 0; #define READ_CTR(name) do { \ while (i >= NUM_COUNTERS) ; \ - long csr = read_csr_safe(name); \ + long csr = read_csr(name); \ if (!enable) { csr -= counters[i]; counter_names[i] = #name; } \ counters[i++] = csr; \ } while (0) - READ_CTR(mcycle); READ_CTR(minstret); - READ_CTR(0xcc0); READ_CTR(0xcc1); READ_CTR(0xcc2); READ_CTR(0xcc3); - READ_CTR(0xcc4); READ_CTR(0xcc5); READ_CTR(0xcc6); READ_CTR(0xcc7); - READ_CTR(0xcc8); READ_CTR(0xcc9); READ_CTR(0xcca); READ_CTR(0xccb); - READ_CTR(0xccc); READ_CTR(0xccd); READ_CTR(0xcce); READ_CTR(0xccf); + + READ_CTR(mcycle); + READ_CTR(minstret); + #undef READ_CTR return 0; } -void tohost_exit(long code) +void __attribute__((noreturn)) tohost_exit(long code) { tohost = (code << 1) | 1; while (1); @@ -68,24 +61,16 @@ void tohost_exit(long code) long handle_trap(long cause, long epc, long regs[32]) { - int* csr_insn; - asm ("jal %0, 1f; csrr a0, 0xcc0; 1:" : "=r"(csr_insn)); - long sys_ret = 0; - - if (cause == CAUSE_ILLEGAL_INSTRUCTION && - (*(int*)epc & *csr_insn) == *csr_insn) - ; - else if (cause != CAUSE_MACHINE_ECALL) + if (cause != CAUSE_MACHINE_ECALL) tohost_exit(1337); else if (regs[17] == SYS_exit) tohost_exit(regs[10]); else if (regs[17] == SYS_stats) - sys_ret = handle_stats(regs[10]); + regs[10] = handle_stats(regs[10]); else - sys_ret = handle_frontend_syscall(regs[17], regs[10], regs[11], regs[12]); + regs[10] = handle_frontend_syscall(regs[17], regs[10], regs[11], regs[12]); - regs[10] = sys_ret; - return epc+4; + return epc + ((*(unsigned short*)epc & 3) == 3 ? 4 : 2); } static long syscall(long num, long arg0, long arg1, long arg2) |