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-rw-r--r--benchmarks/common/crt.S1
-rw-r--r--benchmarks/common/syscalls.c39
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)