[PATCH 03/18] gdb: or1k: Add or1k_push_dummy_code and use it.

Stafford Horne
2016-11-23T22:11:14Z

From: Franck Jullien <franck.jullien@gmail.com>

gdb/ChangeLog:

* or1k-tdep.c (or1k_push_dummy_code): New function.
(or1k_gdbarch_init): Override default behavior and call dummy
from the stack. Set the push_dummy_code handler to
or1k_push_dummy_code.

Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
---
gdb/or1k-tdep.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)

diff --git a/gdb/or1k-tdep.c b/gdb/or1k-tdep.c
index 55b9522..d660a39 100644
--- a/gdb/or1k-tdep.c
+++ b/gdb/or1k-tdep.c
@@ -1112,6 +1112,47 @@ or1k_unwind_sp (struct gdbarch *gdbarch,

} /* or1k_unwind_sp() */

+/*----------------------------------------------------------------------------*/
+/*!Provides return address for dummy call
+
+ Provides an address on the stack where to put a breakpoint as return
+ address for function. bp_addr is the address to which the function should
+ return (which is breakpointed, so gdb can regain control, hence the name).
+
+ @param[in] gdbarch The architecture to use
+ @param[in] sp The stack pointer
+ @param[in] function Pointer to the function that will be called
+ @param[in] args The arguments
+ @param[in] nargs Number of ags to push
+ @param[in] value_type Type of the function result
+ @param[in] real_pc Resume address
+ @param[in] bp_addr Breakpoint address
+ @param[in] regcache The register cache to use
+
+ @return The breakpoint address */
+/*---------------------------------------------------------------------------*/
+
+static CORE_ADDR
+or1k_push_dummy_code (struct gdbarch *gdbarch,
+ CORE_ADDR sp,
+ CORE_ADDR function,
+ struct value **args,
+ int nargs,
+ struct type *value_type,
+ CORE_ADDR *real_pc,
+ CORE_ADDR *bp_addr,
+ struct regcache *regcache)
+{
+ /* Allocate space sufficient for a breakpoint, keeping the stack aligned. */
+ sp = (sp - 4) & ~15;
+ /* Store the address of that breakpoint */
+ *bp_addr = sp;
+ /* The call starts at the callee's entry point. */
+ *real_pc = function;
+
+ return sp;
+
+} /* or1k_push_dummy_code() */

/*----------------------------------------------------------------------------*/
/*!Create a dummy stack frame
@@ -1888,6 +1929,8 @@ or1k_gdbarch_init (struct gdbarch_info info,
set_gdbarch_unwind_sp (gdbarch, or1k_unwind_sp);

/* Functions handling dummy frames */
+ set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+ set_gdbarch_push_dummy_code (gdbarch, or1k_push_dummy_code);
set_gdbarch_push_dummy_call (gdbarch, or1k_push_dummy_call);
set_gdbarch_dummy_id (gdbarch, or1k_dummy_id);

--
2.7.4