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 5687fad..2faf489 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,14 @@
 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.
        * xtensa-tdep.c (C0_NREGS): Remove definition.
 

diff --git a/gdb/xtensa-linux-nat.c b/gdb/xtensa-linux-nat.c
index 69c7eef..a4b001e 100644 (file)
--- 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