From: Max Filippov <jcmvbkbc@gmail.com>
Date: Fri, 18 Nov 2016 17:48:01 +0000 (-0800)
Subject: gdb: xtensa-linux: add call0 support
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0ce4291e3ffd90d2b94e02b4557d716c043bf02e;p=binutils-gdb.git

gdb: xtensa-linux: add call0 support

Correctly handle a0- registers. This allows debugging call0 code in
linux natively.
The register structure is the same for windowed and call0 ABIs because
currently linux kernel internally requires windowed registers, so they are
always present.

gdb/
2017-03-27  Max Filippov  <jcmvbkbc@gmail.com>

	* xtensa-linux-nat.c (fill_gregset): Call regcache_raw_collect
	for a single specified register or for all registers in
	a0_base..a0_base + C0_NREGS range.
	(supply_gregset_reg): Call regcache_raw_supply for a single
	specified register or for all registers in a0_base..a0_base +
	C0_NREGS range.
---

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 5687fada5b5..2faf4897a59 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,12 @@
+2017-03-27  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* xtensa-linux-nat.c (fill_gregset): Call regcache_raw_collect
+	for a single specified register or for all registers in
+	a0_base..a0_base + C0_NREGS range.
+	(supply_gregset_reg): Call regcache_raw_supply for a single
+	specified register or for all registers in a0_base..a0_base +
+	C0_NREGS range.
+
 2017-03-27  Max Filippov  <jcmvbkbc@gmail.com>
 
 	* arch/xtensa.h (C0_NREGS): Add definition.
diff --git a/gdb/xtensa-linux-nat.c b/gdb/xtensa-linux-nat.c
index 69c7eefa664..a4b001e86b9 100644
--- a/gdb/xtensa-linux-nat.c
+++ b/gdb/xtensa-linux-nat.c
@@ -94,6 +94,20 @@ fill_gregset (const struct regcache *regcache,
 			      gdbarch_tdep (gdbarch)->ar_base + i,
 			      &regs->ar[i]);
     }
+  if (regnum >= gdbarch_tdep (gdbarch)->a0_base
+      && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
+    regcache_raw_collect (regcache, regnum,
+			  &regs->ar[(4 * regs->windowbase + regnum
+				     - gdbarch_tdep (gdbarch)->a0_base)
+			  % gdbarch_tdep (gdbarch)->num_aregs]);
+  else if (regnum == -1)
+    {
+      for (i = 0; i < C0_NREGS; ++i)
+	regcache_raw_collect (regcache,
+			      gdbarch_tdep (gdbarch)->a0_base + i,
+			      &regs->ar[(4 * regs->windowbase + i)
+			      % gdbarch_tdep (gdbarch)->num_aregs]);
+    }
 }
 
 static void
@@ -146,6 +160,20 @@ supply_gregset_reg (struct regcache *regcache,
 			      gdbarch_tdep (gdbarch)->ar_base + i,
 			      &regs->ar[i]);
     }
+  if (regnum >= gdbarch_tdep (gdbarch)->a0_base
+      && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
+    regcache_raw_supply (regcache, regnum,
+			 &regs->ar[(4 * regs->windowbase + regnum
+				    - gdbarch_tdep (gdbarch)->a0_base)
+			 % gdbarch_tdep (gdbarch)->num_aregs]);
+  else if (regnum == -1)
+    {
+      for (i = 0; i < C0_NREGS; ++i)
+	regcache_raw_supply (regcache,
+			     gdbarch_tdep (gdbarch)->a0_base + i,
+			     &regs->ar[(4 * regs->windowbase + i)
+			     % gdbarch_tdep (gdbarch)->num_aregs]);
+    }
 }
 
 void