upgrade to latest rocket-chip

tests/Makefile

@@ -1,8 +1,13 @@
 GCC=riscv64-unknown-elf-gcc
+OBJDUMP=riscv64-unknown-elf-objdump
 CFLAGS=-mcmodel=medany -std=gnu99 -O2 -fno-common -fno-builtin-printf
 LDFLAGS=-static -nostdlib -nostartfiles -lgcc
 
-default: pwm.riscv
+PROGRAMS = pwm
+
+default: $(addsuffix .riscv,$(PROGRAMS))
+
+dumps: $(addsuffix .dump,$(PROGRAMS))
 
 %.o: %.S
 	$(GCC) $(CFLAGS) -D__ASSEMBLY__=1 -c $< -o $@
@@ -13,5 +18,8 @@ default: pwm.riscv
 %.riscv: %.o crt.o syscalls.o
 	$(GCC) -T link.ld $(LDFLAGS) $^ -o $@
 
+%.dump: %.riscv
+	$(OBJDUMP) -D $< > $@
+
 clean:
-	rm -f *.riscv *.o
+	rm -f *.riscv *.o *.dump

tests/crt.S

@@ -2,7 +2,7 @@
 
 #include "encoding.h"
 
-#ifdef __riscv64
+#if __riscv_xlen == 64
 # define LREG ld
 # define SREG sd
 # define REGBYTES 8
@@ -12,12 +12,9 @@
 # define REGBYTES 4
 #endif
 
-  .text
+  .section ".text.init"
   .globl _start
 _start:
-  la t0, trap_entry
-  csrw mtvec, t0
-
   li  x1, 0
   li  x2, 0
   li  x3, 0
@@ -55,20 +52,23 @@ _start:
   csrs mstatus, t0
 
   # make sure XLEN agrees with compilation choice
-  csrr t0, misa
-#ifdef __riscv64
-  bltz t0, 1f
-#else
+  li t0, 1
+  slli t0, t0, 31
+#if __riscv_xlen == 64
   bgez t0, 1f
+#else
+  bltz t0, 1f
 #endif
-  li a0, 1234
-  j tohost_exit
+2:
+  li a0, 1
+  sw a0, tohost, t0
+  j 2b
 1:
 
-#ifdef __riscv_hard_float
+#ifdef __riscv_flen
   # initialize FPU if we have one
-  andi t0, t0, 1 << ('f' - 'a')
-  beqz t0, 1f
+  la t0, 1f
+  csrw mtvec, t0
 
   fssr    x0
   fmv.s.x f0, x0
@@ -103,12 +103,18 @@ _start:
   fmv.s.x f29,x0
   fmv.s.x f30,x0
   fmv.s.x f31,x0
+1:
 #endif
 
-1:
+  # initialize trap vector
+  la t0, trap_entry
+  csrw mtvec, t0
 
   # initialize global pointer
-  la gp, _gp
+.option push
+.option norelax
+  la gp, __global_pointer$
+.option pop
 
   la  tp, _end + 63
   and tp, tp, -64

tests/link.ld

@@ -12,6 +12,7 @@
    specifically one of the entires in bfd/cpu-mips.c */
 
 OUTPUT_ARCH( "riscv" )
+ENTRY(_start)
 
 /*----------------------------------------------------------------------*/
 /* Sections                                                             */
@@ -22,7 +23,7 @@ SECTIONS
 
   /* text: test code section */
   . = 0x80000000;
-  .text.init : { crt.o(.text) }
+  .text.init : { *(.text.init) }
 
   .tohost ALIGN(0x1000) : { *(.tohost) }
 
@@ -32,7 +33,7 @@ SECTIONS
   .data : { *(.data) }
 
   .sdata : {
-    _gp = . + 0x800;
+    __global_pointer$ = . + 0x800;
     *(.srodata.cst16) *(.srodata.cst8) *(.srodata.cst4) *(.srodata.cst2) *(.srodata*)
     *(.sdata .sdata.* .gnu.linkonce.s.*)
   }
@@ -48,14 +49,14 @@ SECTIONS
   .tdata :
   {
     _tls_data = .;
-    crt.o(.tdata.begin)
+    *(.tdata.begin)
     *(.tdata)
-    crt.o(.tdata.end)
+    *(.tdata.end)
   }
   .tbss :
   {
     *(.tbss)
-    crt.o(.tbss.end)
+    *(.tbss.end)
   }
 
   /* End of uninitalized data segement */

tests/syscalls.c

@@ -5,16 +5,17 @@
 #include <stdarg.h>
 #include <stdio.h>
 #include <limits.h>
+#include <sys/signal.h>
 #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;
@@ -36,7 +37,7 @@ static uintptr_t handle_frontend_syscall(uintptr_t which, uint64_t arg0, uint64_
 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 { \
@@ -50,7 +51,6 @@ static int handle_stats(int enable)
   READ_CTR(minstret);
 
 #undef READ_CTR
-  return 0;
 }
 
 void __attribute__((noreturn)) tohost_exit(uintptr_t code)
@@ -59,39 +59,19 @@ void __attribute__((noreturn)) tohost_exit(uintptr_t code)
   while (1);
 }
 
-uintptr_t handle_trap(uintptr_t cause, uintptr_t epc, uintptr_t regs[32])
+uintptr_t __attribute__((weak)) 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)
-{
-  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);
+  tohost_exit(code);
 }
 
-void setStats(int enable)
+void abort()
 {
-  syscall(SYS_stats, enable, 0, 0);
+  exit(128 + SIGABRT);
 }
 
 void printstr(const char* s)