[Pdbg] [PATCH 14/14] gdbserver: Add POWER10 support

[Nicholas Piggin]

Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
 src/pdbgproxy.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/pdbgproxy.c b/src/pdbgproxy.c
index e8aab70..b44aea4 100644
--- a/src/pdbgproxy.c
+++ b/src/pdbgproxy.c
@@ -104,6 +104,8 @@ static void detach(uint64_t *stack, void *priv)
 }
 
 #define POWER8_HID_ENABLE_ATTN			PPC_BIT(31)
+#define POWER10_HID_ENABLE_ATTN			PPC_BIT(3)
+#define POWER10_HID_FLUSH_ICACHE		PPC_BIT(2)
 
 static int set_attn(bool enable)
 {
@@ -122,6 +124,17 @@ static int set_attn(bool enable)
 				return 0;
 			hid &= ~POWER8_HID_ENABLE_ATTN;
 		}
+	} else if (pdbg_target_compatible(thread_target, "ibm,power10-thread")) {
+		if (enable) {
+			if (hid & POWER10_HID_ENABLE_ATTN)
+				return 0;
+			hid |= POWER10_HID_ENABLE_ATTN;
+		} else {
+			if (!(hid & POWER10_HID_ENABLE_ATTN))
+				return 0;
+			hid &= ~POWER10_HID_ENABLE_ATTN;
+		}
+		hid |= POWER10_HID_FLUSH_ICACHE;
 	} else {
 		return -1;
 	}
@@ -572,9 +585,12 @@ static int gdbserver(uint16_t port)
 	}
 
 	//
-	// Temporary until I can get this working a bit smoother on p9
-	if (!pdbg_target_compatible(thread, "ibm,power8-thread")) {
-		PR_ERROR("GDBSERVER is only available on POWER8\n");
+	// POWER9 appears to have problems with PSI interrupts when hitting
+	// an attn intstruction. Could just disallow breakpoints on P9.
+	//
+	if (!pdbg_target_compatible(thread, "ibm,power8-thread") &&
+	    !pdbg_target_compatible(thread, "ibm,power10-thread")) {
+		PR_ERROR("GDBSERVER is only available on POWER8 and POWER10\n");
 		return -1;
 	}
 
-- 
2.23.0