From 3dc066382bebce5a86a72a095c17b1eaa58b0b89 Mon Sep 17 00:00:00 2001
From: Megan Wachs <megan@sifive.com>
Date: Wed, 5 Apr 2017 15:07:09 -0700
Subject: [PATCH] Properly consider 'reset halt' and do halt or resume as
 needed

---
 src/target/riscv/riscv-013.c | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

diff --git a/src/target/riscv/riscv-013.c b/src/target/riscv/riscv-013.c
index 17201d61f..0957bdc6a 100644
--- a/src/target/riscv/riscv-013.c
+++ b/src/target/riscv/riscv-013.c
@@ -1818,16 +1818,43 @@ static int riscv013_resume(struct target *target, int current, uint32_t address,
 static int assert_reset(struct target *target)
 {
   select_dmi(target);
+  uint32_t control = DMI_DMCONTROL_DMACTIVE | DMI_DMCONTROL_NDMRESET;
+  if (target->reset_halt) {
+    LOG_DEBUG("TARGET RESET HALT SET, Requesting halt during reset.\n");
+    control |= DMI_DMCONTROL_HALTREQ;
+  }
+    
   dmi_write(target, DMI_DMCONTROL,
-	    DMI_DMCONTROL_DMACTIVE | DMI_DMCONTROL_NDMRESET);
+	    control);
+
+  if (!target->reset_halt) {
+    LOG_DEBUG("TARGET RESET HALT NOT SET, Requesting resume during reset.\n");
+    control = DMI_DMCONTROL_DMACTIVE | DMI_DMCONTROL_RESUMEREQ;
+    dmi_write(target, DMI_DMCONTROL, control);
+  }
+    
   return ERROR_OK;
 }
 
 static int deassert_reset(struct target *target)
 {
   select_dmi(target);
-  dmi_write(target, DMI_DMCONTROL,
-	    DMI_DMCONTROL_DMACTIVE);
+
+  // Note that we don't need to keep asserting
+  // haltreq since we already set it in assert_reset.
+  dmi_write(target, DMI_DMCONTROL, DMI_DMCONTROL_DMACTIVE);
+  
+  if (target->reset_halt) {
+    LOG_DEBUG("TARGET RESET HALT SET, waiting for hart to be halted.\n");
+    while (get_field(dmi_read(target, DMI_DMSTATUS), DMI_DMSTATUS_ALLHALTED) == 0) {
+    }
+    // This is necessary to re-read all the registers.
+    handle_halt(target, true);
+  } else {
+    LOG_DEBUG("TARGET RESET HALT NOT SET, waiting for hart to be running.\n");
+    while (get_field(dmi_read(target, DMI_DMSTATUS), DMI_DMSTATUS_ALLRUNNING) == 0) {
+    }
+  }
   return ERROR_OK;
 }