Merge branch 'mylai-mtk-zicfilp-upstream'

machine/mentry.S

@@ -8,27 +8,30 @@
   .align 6
 trap_table:
 #define BAD_TRAP_VECTOR 0
-  .dc.a bad_trap
-  .dc.a pmp_trap
-  .dc.a illegal_insn_trap
-  .dc.a bad_trap
-  .dc.a misaligned_load_trap
-  .dc.a pmp_trap
-  .dc.a misaligned_store_trap
-  .dc.a pmp_trap
-  .dc.a bad_trap
-  .dc.a mcall_trap
-  .dc.a bad_trap
+  /* 00 */ .dc.a bad_trap
+  /* 01 */ .dc.a pmp_trap
+  /* 02 */ .dc.a illegal_insn_trap
+  /* 03 */ .dc.a bad_trap
+  /* 04 */ .dc.a misaligned_load_trap
+  /* 05 */ .dc.a pmp_trap
+  /* 06 */ .dc.a misaligned_store_trap
+  /* 07 */ .dc.a pmp_trap
+  /* 08 */ .dc.a bad_trap
+  /* 09 */ .dc.a mcall_trap
+  /* 10 */ .dc.a bad_trap
 #ifdef BBL_BOOT_MACHINE
-  .dc.a mcall_trap
+  /* 11 */ .dc.a mcall_trap
 #else
-  .dc.a bad_trap
+  /* 11 */ .dc.a bad_trap
 #endif /* BBL_BOOT_MACHINE */
-  .dc.a bad_trap
+  /* 12 */ .dc.a bad_trap
 #define TRAP_FROM_MACHINE_MODE_VECTOR 13
-  .dc.a __trap_from_machine_mode
-  .dc.a bad_trap
-  .dc.a bad_trap
+  /* 13 */ .dc.a __trap_from_machine_mode
+  /* 14 */ .dc.a bad_trap
+  /* 15 */ .dc.a bad_trap
+  /* 16 */ .dc.a bad_trap
+  /* 17 */ .dc.a bad_trap
+  /* 18 */ .dc.a bad_trap
 
   .option norvc
   .section .text.init,"ax",@progbits

machine/minit.c

@@ -79,7 +79,8 @@ static void delegate_traps()
     (1U << CAUSE_BREAKPOINT) |
     (1U << CAUSE_LOAD_PAGE_FAULT) |
     (1U << CAUSE_STORE_PAGE_FAULT) |
-    (1U << CAUSE_USER_ECALL);
+    (1U << CAUSE_USER_ECALL) |
+    (1U << CAUSE_SOFTWARE_CHECK_FAULT);
 
   write_csr(mideleg, interrupts);
   write_csr(medeleg, exceptions);

pk/handlers.c

@@ -90,6 +90,21 @@ static void handle_interrupt(trapframe_t* tf)
   clear_csr(sip, SIP_SSIP);
 }
 
+static void handle_software_check_fault(trapframe_t* tf)
+{
+  dump_tf(tf);
+
+  const uint64_t stval = read_csr(stval);
+  switch (stval) {
+    case LANDING_PAD_FAULT:
+      panic("Invalid landing pad!");
+      break;
+    default:
+      panic("Software check fault: unhandled stval: %d", stval);
+      break;
+  }
+}
+
 void handle_trap(trapframe_t* tf)
 {
   if ((intptr_t)tf->cause < 0)
@@ -110,6 +125,7 @@ void handle_trap(trapframe_t* tf)
     [CAUSE_MISALIGNED_STORE] = handle_misaligned_store,
     [CAUSE_LOAD_PAGE_FAULT] = handle_fault_load,
     [CAUSE_STORE_PAGE_FAULT] = handle_fault_store,
+    [CAUSE_SOFTWARE_CHECK_FAULT] = handle_software_check_fault,
   };
 
   kassert(tf->cause < ARRAY_SIZE(trap_handlers) && trap_handlers[tf->cause]);

pk/pk.c

@@ -13,6 +13,7 @@
 
 elf_info current;
 long disabled_hart_mask;
+bool zicfilp_enabled;
 
 static void help()
 {
@@ -22,6 +23,7 @@ static void help()
   printk("  -h, --help            Print this help message\n");
   printk("  -p                    Disable on-demand program paging\n");
   printk("  -s                    Print cycles upon termination\n");
+  printk("  --zicfilp             Enable Zicfilp CFI mechanism for user program\n");
 
   shutdown(0);
 }
@@ -54,6 +56,11 @@ static void handle_option(const char* arg)
     return;
   }
 
+  if (strcmp(arg, "--zicfilp") == 0) {
+    zicfilp_enabled = true;
+    return;
+  }
+
   panic("unrecognized option: `%s'", arg);
   suggest_help();
 }
@@ -177,6 +184,8 @@ static void run_loaded_program(size_t argc, char** argv, uintptr_t kstack_top)
   init_tf(&tf, current.entry, stack_top);
   __riscv_flush_icache();
   write_csr(sscratch, kstack_top);
+  if (zicfilp_enabled)
+    set_csr(senvcfg, SENVCFG_LPE);
   start_user(&tf);
 }