git: 0adc959a3730 - main - sys/gdb: Support hardware breakpoints

The branch main has been updated by andrew:

URL: https://cgit.FreeBSD.org/src/commit/?id=0adc959a37303939e6c64cbeea47a62670bfaf58

commit 0adc959a37303939e6c64cbeea47a62670bfaf58
Author:     Andrew Turner <andrew@FreeBSD.org>
AuthorDate: 2024-03-14 15:09:03 +0000
Commit:     Andrew Turner <andrew@FreeBSD.org>
CommitDate: 2024-04-12 09:32:55 +0000

    sys/gdb: Support hardware breakpoints
    
    Support the use of hardware breakpoints in the kernel gdb stub.
    
    Reviewed by:    jhb (earlier version)
    Sponsored by:   Arm Ltd
    Differential Revision:  https://reviews.freebsd.org/D44354
---
 sys/gdb/gdb_main.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sys/gdb/gdb_main.c b/sys/gdb/gdb_main.c
index 5567c12c2a9f..3e8ada42adac 100644
--- a/sys/gdb/gdb_main.c
+++ b/sys/gdb/gdb_main.c
@@ -267,6 +267,11 @@ nofeatures:
 
 	gdb_tx_str(";qXfer:threads:read+");
 
+#ifdef HAS_HW_BREAKPOINT
+	if ((*feat & GDB_HWBREAK) != 0)
+		gdb_tx_str(";hwbreak+");
+#endif
+
 	/*
 	 * If the debugport is a reliable transport, request No Ack mode from
 	 * the server.  The server may or may not choose to enter No Ack mode.
@@ -648,6 +653,10 @@ gdb_z_insert(void)
 		    (vm_size_t)length, KDB_DBG_ACCESS_RW);
 		break;
 	case '1': /* hardware breakpoint */
+#ifdef HAS_HW_BREAKPOINT
+		error = kdb_cpu_set_breakpoint((vm_offset_t)addr);
+		break;
+#endif
 	case '0': /* software breakpoint */
 		/* Not implemented. */
 		gdb_tx_empty();
@@ -692,6 +701,10 @@ gdb_z_remove(void)
 		    (vm_size_t)length);
 		break;
 	case '1': /* hardware breakpoint */
+#ifdef HAS_HW_BREAKPOINT
+		error = kdb_cpu_clr_breakpoint((vm_offset_t)addr);
+		break;
+#endif
 	case '0': /* software breakpoint */
 		/* Not implemented. */
 		gdb_tx_empty();