From: Kevin Buettner <kevinb@redhat.com>
Date: Tue, 14 Oct 2003 00:30:27 +0000 (+0000)
Subject: 	* frv-tdep.c (max_instrs_per_bundle, frv_instr_size): New constants.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=46a16dba957f0b448278b1802c780368061c27b9;p=binutils-gdb.git

	* frv-tdep.c (max_instrs_per_bundle, frv_instr_size): New constants.
	(frv_gdbarch_adjust_breakpoint_address): New function.
	(frv_gdbarch_init): Initialize ``gdbarch_adjust_breakpoint_address''
	method.
---

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9f126524c35..1a77033b560 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+2003-10-13  Kevin Buettner  <kevinb@redhat.com>
+
+	* frv-tdep.c (max_instrs_per_bundle, frv_instr_size): New constants.
+	(frv_gdbarch_adjust_breakpoint_address): New function.
+	(frv_gdbarch_init): Initialize ``gdbarch_adjust_breakpoint_address''
+	method.
+
 2003-10-13  Kevin Buettner  <kevinb@redhat.com>
 
 	* breakpoint.h (struct breakpoint): Add new member
diff --git a/gdb/frv-tdep.c b/gdb/frv-tdep.c
index 22bac8febad..055afc5c8e3 100644
--- a/gdb/frv-tdep.c
+++ b/gdb/frv-tdep.c
@@ -37,6 +37,7 @@ static gdbarch_init_ftype frv_gdbarch_init;
 
 static gdbarch_register_name_ftype frv_register_name;
 static gdbarch_breakpoint_from_pc_ftype frv_breakpoint_from_pc;
+static gdbarch_adjust_breakpoint_address_ftype frv_gdbarch_adjust_breakpoint_address;
 static gdbarch_skip_prologue_ftype frv_skip_prologue;
 static gdbarch_deprecated_extract_return_value_ftype frv_extract_return_value;
 static gdbarch_deprecated_extract_struct_value_address_ftype frv_extract_struct_value_address;
@@ -271,6 +272,51 @@ frv_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenp)
   return breakpoint;
 }
 
+/* Define the maximum number of instructions which may be packed into a
+   bundle (VLIW instruction).  */
+static const int max_instrs_per_bundle = 8;
+
+/* Define the size (in bytes) of an FR-V instruction.  */
+static const int frv_instr_size = 4;
+
+/* Adjust a breakpoint's address to account for the FR-V architecture's
+   constraint that a break instruction must not appear as any but the
+   first instruction in the bundle.  */
+static CORE_ADDR
+frv_gdbarch_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr)
+{
+  int count = max_instrs_per_bundle;
+  CORE_ADDR addr = bpaddr - frv_instr_size;
+  CORE_ADDR func_start = get_pc_function_start (bpaddr);
+
+  /* Find the end of the previous packing sequence.  This will be indicated
+     by either attempting to access some inaccessible memory or by finding
+     an instruction word whose packing bit is set to one. */
+  while (count-- > 0 && addr >= func_start)
+    {
+      char instr[frv_instr_size];
+      int status;
+
+      status = read_memory_nobpt (addr, instr, sizeof instr);
+
+      if (status != 0)
+	break;
+
+      /* This is a big endian architecture, so byte zero will have most
+         significant byte.  The most significant bit of this byte is the
+         packing bit.  */
+      if (instr[0] & 0x80)
+	break;
+
+      addr -= frv_instr_size;
+    }
+
+  if (count > 0)
+    bpaddr = addr + frv_instr_size;
+
+  return bpaddr;
+}
+
 
 /* Return true if REG is a caller-saves ("scratch") register,
    false otherwise.  */
@@ -1114,6 +1160,7 @@ frv_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 
   set_gdbarch_skip_prologue (gdbarch, frv_skip_prologue);
   set_gdbarch_breakpoint_from_pc (gdbarch, frv_breakpoint_from_pc);
+  set_gdbarch_adjust_breakpoint_address (gdbarch, frv_gdbarch_adjust_breakpoint_address);
 
   set_gdbarch_frame_args_skip (gdbarch, 0);
   set_gdbarch_frameless_function_invocation (gdbarch, frv_frameless_function_invocation);