Re: [commit/powerpc] crash trying to allocate memory in inferior

Ulrich Weigand
2011-10-26T17:25:07Z

Joel Brobeker wrote:

> * ppc-sysv-tdep.c (do_ppc_sysv_return_value): Do not check
> FUNC_TYPE's calling convention if FUNC_TYPE is not a function.

Huh, I had just been testing a different patch for the same problem ...

Since this patch is a bit more general (it also fixes the 64-bit case,
and actually handles pointers to OpenCL functions), I've checked it
in anyway.

Tested on powerpc64-linux.

Bye,
Ulrich

ChangeLog:

* ppc-sysv-tdep.c (ppc_sysv_use_opencl_abi): New function.
(ppc_sysv_abi_push_dummy_call): Use it.
(do_ppc_sysv_return_value): Likewise.
(ppc64_sysv_abi_push_dummy_call): Likewise.
(ppc64_sysv_abi_return_value): Likewise.

Index: gdb/ppc-sysv-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/ppc-sysv-tdep.c,v
retrieving revision 1.64
diff -u -p -r1.64 ppc-sysv-tdep.c
--- gdb/ppc-sysv-tdep.c 24 Oct 2011 16:51:36 -0000 1.64
+++ gdb/ppc-sysv-tdep.c 26 Oct 2011 16:12:56 -0000
@@ -32,6 +32,22 @@
#include "infcall.h"
#include "dwarf2.h"

+
+/* Check whether FTPYE is a (pointer to) function type that should use
+ the OpenCL vector ABI. */
+
+static int
+ppc_sysv_use_opencl_abi (struct type *ftype)
+{
+ ftype = check_typedef (ftype);
+
+ if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
+ ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
+
+ return (TYPE_CODE (ftype) == TYPE_CODE_FUNC
+ && TYPE_CALLING_CONVENTION (ftype) == DW_CC_GDB_IBM_OpenCL);
+}
+
/* Pass the arguments in either registers, or in the stack. Using the
ppc sysv ABI, the first eight words of the argument list (that might
be less than eight parameters if some parameters occupy more than one
@@ -51,8 +67,7 @@ ppc_sysv_abi_push_dummy_call (struct gdb
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- struct type *ftype;
- int opencl_abi = 0;
+ int opencl_abi = ppc_sysv_use_opencl_abi (value_type (function));
ULONGEST saved_sp;
int argspace = 0; /* 0 is an initial wrong guess. */
int write_pass;
@@ -62,13 +77,6 @@ ppc_sysv_abi_push_dummy_call (struct gdb
regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch),
&saved_sp);

- ftype = check_typedef (value_type (function));
- if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
- ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
- if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
- && TYPE_CALLING_CONVENTION (ftype) == DW_CC_GDB_IBM_OpenCL)
- opencl_abi = 1;
-
/* Go through the argument list twice.

Pass 1: Figure out how much new stack space is required for
@@ -689,12 +697,7 @@ do_ppc_sysv_return_value (struct gdbarch
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- int opencl_abi = 0;
-
- if (func_type
- && TYPE_CODE (func_type) == TYPE_CODE_FUNC
- && TYPE_CALLING_CONVENTION (func_type) == DW_CC_GDB_IBM_OpenCL)
- opencl_abi = 1;
+ int opencl_abi = func_type? ppc_sysv_use_opencl_abi (func_type) : 0;

gdb_assert (tdep->wordsize == 4);

@@ -1115,8 +1118,7 @@ ppc64_sysv_abi_push_dummy_call (struct g
CORE_ADDR func_addr = find_function_addr (function, NULL);
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- struct type *ftype;
- int opencl_abi = 0;
+ int opencl_abi = ppc_sysv_use_opencl_abi (value_type (function));
ULONGEST back_chain;
/* See for-loop comment below. */
int write_pass;
@@ -1146,13 +1148,6 @@ ppc64_sysv_abi_push_dummy_call (struct g
regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch),
&back_chain);

- ftype = check_typedef (value_type (function));
- if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
- ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
- if (TYPE_CODE (ftype) == TYPE_CODE_FUNC
- && TYPE_CALLING_CONVENTION (ftype) == DW_CC_GDB_IBM_OpenCL)
- opencl_abi = 1;
-
/* Go through the argument list twice.

Pass 1: Compute the function call's stack space and register
@@ -1721,11 +1716,7 @@ ppc64_sysv_abi_return_value (struct gdba
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- int opencl_abi = 0;
-
- if (func_type
- && TYPE_CALLING_CONVENTION (func_type) == DW_CC_GDB_IBM_OpenCL)
- opencl_abi = 1;
+ int opencl_abi = func_type? ppc_sysv_use_opencl_abi (func_type) : 0;

/* This function exists to support a calling convention that
requires floating-point registers. It shouldn't be used on

--
Dr. Ulrich Weigand
GNU Toolchain for Linux on System z and Cell BE
Ulrich.Weigand@de.ibm.com