diff mbox

[v2,3/5] gdb: xtensa-linux: add call0 support

Message ID 1487729356-10432-4-git-send-email-jcmvbkbc@gmail.com
State New, archived
Headers

Commit Message

Max Filippov Feb. 22, 2017, 2:09 a.m. UTC 
  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/
2017-01-18  Max Filippov  <jcmvbkbc@gmail.com>

	* xtensa-linux-nat.c (C0_NREGS): New definition.
	(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.
---
Changes v1->v2:
- move directory name up in the commit message.

 gdb/xtensa-linux-nat.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
diff mbox

Patch

diff --git a/gdb/xtensa-linux-nat.c b/gdb/xtensa-linux-nat.c
index afe15f6..e5a2d84 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