/* Native support code for PPC AIX, for GDB the GNU debugger.
- Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+ Copyright (C) 2006-2020 Free Software Foundation, Inc.
Free Software Foundation, Inc.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "gdb_string.h"
-#include "gdb_assert.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "breakpoint.h"
#include "rs6000-tdep.h"
#include "ppc-tdep.h"
-#include "exceptions.h"
-
-/* Hook for determining the TOC address when calling functions in the
- inferior under AIX. The initialization code in rs6000-nat.c sets
- this hook to point to find_toc_address. */
-
-CORE_ADDR (*rs6000_find_toc_address_hook) (CORE_ADDR) = NULL;
+#include "rs6000-aix-tdep.h"
+#include "xcoffread.h"
+#include "solib.h"
+#include "solib-aix.h"
+#include "target-float.h"
+#include "gdbsupport/xml-utils.h"
+#include "trad-frame.h"
+#include "frame-unwind.h"
/* If the kernel has to deliver a signal, it pushes a sigcontext
structure on the stack and then calls the signal handler, passing
- the address of the sigcontext in an argument register. Usually
+ the address of the sigcontext in an argument register. Usually
the signal handler doesn't save this register, so we have to
access the sigcontext structure via an offset from the signal handler
frame.
- The following constants were determined by experimentation on AIX 3.2. */
+ The following constants were determined by experimentation on AIX 3.2.
+
+ sigcontext structure have the mstsave saved under the
+ sc_jmpbuf.jmp_context. STKMIN(minimum stack size) is 56 for 32-bit
+ processes, and iar offset under sc_jmpbuf.jmp_context is 40.
+ ie offsetof(struct sigcontext, sc_jmpbuf.jmp_context.iar).
+ so PC offset in this case is STKMIN+iar offset, which is 96. */
+
#define SIG_FRAME_PC_OFFSET 96
#define SIG_FRAME_LR_OFFSET 108
+/* STKMIN+grp1 offset, which is 56+228=284 */
#define SIG_FRAME_FP_OFFSET 284
+/* 64 bit process.
+ STKMIN64 is 112 and iar offset is 312. So 112+312=424 */
+#define SIG_FRAME_LR_OFFSET64 424
+/* STKMIN64+grp1 offset. 112+56=168 */
+#define SIG_FRAME_FP_OFFSET64 168
+
+static struct trad_frame_cache *
+aix_sighandle_frame_cache (struct frame_info *this_frame,
+ void **this_cache)
+{
+ LONGEST backchain;
+ CORE_ADDR base, base_orig, func;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct trad_frame_cache *this_trad_cache;
+
+ if ((*this_cache) != NULL)
+ return (struct trad_frame_cache *) (*this_cache);
+
+ this_trad_cache = trad_frame_cache_zalloc (this_frame);
+ (*this_cache) = this_trad_cache;
+
+ base = get_frame_register_unsigned (this_frame,
+ gdbarch_sp_regnum (gdbarch));
+ base_orig = base;
+
+ if (tdep->wordsize == 4)
+ {
+ func = read_memory_unsigned_integer (base_orig +
+ SIG_FRAME_PC_OFFSET + 8,
+ tdep->wordsize, byte_order);
+ safe_read_memory_integer (base_orig + SIG_FRAME_FP_OFFSET + 8,
+ tdep->wordsize, byte_order, &backchain);
+ base = (CORE_ADDR)backchain;
+ }
+ else
+ {
+ func = read_memory_unsigned_integer (base_orig +
+ SIG_FRAME_LR_OFFSET64,
+ tdep->wordsize, byte_order);
+ safe_read_memory_integer (base_orig + SIG_FRAME_FP_OFFSET64,
+ tdep->wordsize, byte_order, &backchain);
+ base = (CORE_ADDR)backchain;
+ }
+
+ trad_frame_set_reg_value (this_trad_cache, gdbarch_pc_regnum (gdbarch), func);
+ trad_frame_set_reg_value (this_trad_cache, gdbarch_sp_regnum (gdbarch), base);
+
+ if (tdep->wordsize == 4)
+ trad_frame_set_reg_addr (this_trad_cache, tdep->ppc_lr_regnum,
+ base_orig + 0x38 + 52 + 8);
+ else
+ trad_frame_set_reg_addr (this_trad_cache, tdep->ppc_lr_regnum,
+ base_orig + 0x70 + 320);
+
+ trad_frame_set_id (this_trad_cache, frame_id_build (base, func));
+ trad_frame_set_this_base (this_trad_cache, base);
+
+ return this_trad_cache;
+}
+
+static void
+aix_sighandle_frame_this_id (struct frame_info *this_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
+{
+ struct trad_frame_cache *this_trad_cache
+ = aix_sighandle_frame_cache (this_frame, this_prologue_cache);
+ trad_frame_get_id (this_trad_cache, this_id);
+}
+
+static struct value *
+aix_sighandle_frame_prev_register (struct frame_info *this_frame,
+ void **this_prologue_cache, int regnum)
+{
+ struct trad_frame_cache *this_trad_cache
+ = aix_sighandle_frame_cache (this_frame, this_prologue_cache);
+ return trad_frame_get_register (this_trad_cache, this_frame, regnum);
+}
+
+static int
+aix_sighandle_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ if (pc && pc < AIX_TEXT_SEGMENT_BASE)
+ return 1;
+
+ return 0;
+}
+
+/* AIX signal handler frame unwinder */
+
+static const struct frame_unwind aix_sighandle_frame_unwind = {
+ SIGTRAMP_FRAME,
+ default_frame_unwind_stop_reason,
+ aix_sighandle_frame_this_id,
+ aix_sighandle_frame_prev_register,
+ NULL,
+ aix_sighandle_frame_sniffer
+};
/* Core file support. */
/* Floating-point registers. */
336, /* f0_offset */
56, /* fpscr_offset */
- 4, /* fpscr_size */
-
- /* AltiVec registers. */
- -1, /* vr0_offset */
- -1, /* vscr_offset */
- -1 /* vrsave_offset */
+ 4 /* fpscr_size */
};
static struct ppc_reg_offsets rs6000_aix64_reg_offsets =
/* Floating-point registers. */
312, /* f0_offset */
296, /* fpscr_offset */
- 4, /* fpscr_size */
-
- /* AltiVec registers. */
- -1, /* vr0_offset */
- -1, /* vscr_offset */
- -1 /* vrsave_offset */
+ 4 /* fpscr_size */
};
}
/* Collect register REGNUM in the general-purpose register set
- REGSET. from register cache REGCACHE into the buffer specified by
+ REGSET, from register cache REGCACHE into the buffer specified by
GREGS and LEN. If REGNUM is -1, do this for all registers in
REGSET. */
/* AIX register set. */
-static struct regset rs6000_aix32_regset =
+static const struct regset rs6000_aix32_regset =
{
&rs6000_aix32_reg_offsets,
rs6000_aix_supply_regset,
rs6000_aix_collect_regset,
};
-static struct regset rs6000_aix64_regset =
+static const struct regset rs6000_aix64_regset =
{
&rs6000_aix64_reg_offsets,
rs6000_aix_supply_regset,
rs6000_aix_collect_regset,
};
-/* Return the appropriate register set for the core section identified
- by SECT_NAME and SECT_SIZE. */
+/* Iterate over core file register note sections. */
-static const struct regset *
-rs6000_aix_regset_from_core_section (struct gdbarch *gdbarch,
- const char *sect_name, size_t sect_size)
+static void
+rs6000_aix_iterate_over_regset_sections (struct gdbarch *gdbarch,
+ iterate_over_regset_sections_cb *cb,
+ void *cb_data,
+ const struct regcache *regcache)
{
if (gdbarch_tdep (gdbarch)->wordsize == 4)
- {
- if (strcmp (sect_name, ".reg") == 0 && sect_size >= 592)
- return &rs6000_aix32_regset;
- }
+ cb (".reg", 592, 592, &rs6000_aix32_regset, NULL, cb_data);
else
- {
- if (strcmp (sect_name, ".reg") == 0 && sect_size >= 576)
- return &rs6000_aix64_regset;
- }
-
- return NULL;
+ cb (".reg", 576, 576, &rs6000_aix64_regset, NULL, cb_data);
}
-/* Pass the arguments in either registers, or in the stack. In RS/6000,
+/* Pass the arguments in either registers, or in the stack. In RS/6000,
the first eight words of the argument list (that might be less than
eight parameters if some parameters occupy more than one word) are
- passed in r3..r10 registers. float and double parameters are
+ passed in r3..r10 registers. Float and double parameters are
passed in fpr's, in addition to that. Rest of the parameters if any
are passed in user stack. There might be cases in which half of the
parameter is copied into registers, the other half is pushed into
rs6000_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+ function_call_return_method return_method,
+ CORE_ADDR struct_addr)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
(which will be passed in r3) is used for struct return address.
In that case we should advance one word and start from r4
register to copy parameters. */
- if (struct_return)
+ if (return_method == return_method_struct)
{
regcache_raw_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
struct_addr);
ii++;
}
-/*
- effectively indirect call... gcc does...
+/* effectively indirect call... gcc does...
return_val example( float, int);
offset of stack on overflow different
both:
return in r3 or f0. If no float, must study how gcc emulates floats;
- pay attention to arg promotion.
+ pay attention to arg promotion.
User may have to cast\args to handle promotion correctly
- since gdb won't know if prototype supplied or not.
- */
+ since gdb won't know if prototype supplied or not. */
for (argno = 0, argbytes = 0; argno < nargs && ii < 8; ++ii)
{
type = check_typedef (value_type (arg));
len = TYPE_LENGTH (type);
- if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ if (type->code () == TYPE_CODE_FLT)
{
-
/* Floating point arguments are passed in fpr's, as well as gpr's.
- There are 13 fpr's reserved for passing parameters. At this point
- there is no way we would run out of them. */
+ There are 13 fpr's reserved for passing parameters. At this point
+ there is no way we would run out of them.
+
+ Always store the floating point value using the register's
+ floating-point format. */
+ const int fp_regnum = tdep->ppc_fp0_regnum + 1 + f_argno;
+ gdb_byte reg_val[PPC_MAX_REGISTER_SIZE];
+ struct type *reg_type = register_type (gdbarch, fp_regnum);
gdb_assert (len <= 8);
- regcache_cooked_write (regcache,
- tdep->ppc_fp0_regnum + 1 + f_argno,
- value_contents (arg));
+ target_float_convert (value_contents (arg), type, reg_val, reg_type);
+ regcache->cooked_write (fp_regnum, reg_val);
++f_argno;
}
/* Argument takes more than one register. */
while (argbytes < len)
{
- gdb_byte word[MAX_REGISTER_SIZE];
+ gdb_byte word[PPC_MAX_REGISTER_SIZE];
memset (word, 0, reg_size);
memcpy (word,
((char *) value_contents (arg)) + argbytes,
(len - argbytes) > reg_size
? reg_size : len - argbytes);
- regcache_cooked_write (regcache,
- tdep->ppc_gp0_regnum + 3 + ii,
- word);
+ regcache->cooked_write (tdep->ppc_gp0_regnum + 3 + ii, word);
++ii, argbytes += reg_size;
if (ii >= 8)
else
{
/* Argument can fit in one register. No problem. */
- int adj = gdbarch_byte_order (gdbarch)
- == BFD_ENDIAN_BIG ? reg_size - len : 0;
- gdb_byte word[MAX_REGISTER_SIZE];
+ gdb_byte word[PPC_MAX_REGISTER_SIZE];
memset (word, 0, reg_size);
memcpy (word, value_contents (arg), len);
- regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3 +ii, word);
+ regcache->cooked_write (tdep->ppc_gp0_regnum + 3 +ii, word);
}
++argno;
}
sp -= space;
/* This is another instance we need to be concerned about
- securing our stack space. If we write anything underneath %sp
+ securing our stack space. If we write anything underneath %sp
(r1), we might conflict with the kernel who thinks he is free
to use this area. So, update %sp first before doing anything
else. */
/* Float types should be passed in fpr's, as well as in the
stack. */
- if (TYPE_CODE (type) == TYPE_CODE_FLT && f_argno < 13)
+ if (type->code () == TYPE_CODE_FLT && f_argno < 13)
{
gdb_assert (len <= 8);
- regcache_cooked_write (regcache,
- tdep->ppc_fp0_regnum + 1 + f_argno,
- value_contents (arg));
+ regcache->cooked_write (tdep->ppc_fp0_regnum + 1 + f_argno,
+ value_contents (arg));
++f_argno;
}
breakpoint. */
regcache_raw_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
- /* Set the TOC register, get the value from the objfile reader
- which, in turn, gets it from the VMAP table. */
- if (rs6000_find_toc_address_hook != NULL)
- {
- CORE_ADDR tocvalue = (*rs6000_find_toc_address_hook) (func_addr);
- regcache_raw_write_signed (regcache, tdep->ppc_toc_regnum, tocvalue);
- }
+ /* Set the TOC register value. */
+ regcache_raw_write_signed (regcache, tdep->ppc_toc_regnum,
+ solib_aix_get_toc_value (func_addr));
target_store_registers (regcache, -1);
return sp;
}
static enum return_value_convention
-rs6000_return_value (struct gdbarch *gdbarch, struct type *func_type,
+rs6000_return_value (struct gdbarch *gdbarch, struct value *function,
struct type *valtype, struct regcache *regcache,
gdb_byte *readbuf, const gdb_byte *writebuf)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- gdb_byte buf[8];
/* The calling convention this function implements assumes the
processor has floating-point registers. We shouldn't be using it
/* AltiVec extension: Functions that declare a vector data type as a
return value place that return value in VR2. */
- if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype)
+ if (valtype->code () == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype)
&& TYPE_LENGTH (valtype) == 16)
{
if (readbuf)
- regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
+ regcache->cooked_read (tdep->ppc_vr0_regnum + 2, readbuf);
if (writebuf)
- regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
+ regcache->cooked_write (tdep->ppc_vr0_regnum + 2, writebuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}
/* If the called subprogram returns an aggregate, there exists an
implicit first argument, whose value is the address of a caller-
allocated buffer into which the callee is assumed to store its
- return value. All explicit parameters are appropriately
+ return value. All explicit parameters are appropriately
relabeled. */
- if (TYPE_CODE (valtype) == TYPE_CODE_STRUCT
- || TYPE_CODE (valtype) == TYPE_CODE_UNION
- || TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
+ if (valtype->code () == TYPE_CODE_STRUCT
+ || valtype->code () == TYPE_CODE_UNION
+ || valtype->code () == TYPE_CODE_ARRAY)
return RETURN_VALUE_STRUCT_CONVENTION;
/* Scalar floating-point values are returned in FPR1 for float or
double, and in FPR1:FPR2 for quadword precision. Fortran
complex*8 and complex*16 are returned in FPR1:FPR2, and
complex*32 is returned in FPR1:FPR4. */
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT
+ if (valtype->code () == TYPE_CODE_FLT
&& (TYPE_LENGTH (valtype) == 4 || TYPE_LENGTH (valtype) == 8))
{
struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
if (readbuf)
{
- regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
- convert_typed_floating (regval, regtype, readbuf, valtype);
+ regcache->cooked_read (tdep->ppc_fp0_regnum + 1, regval);
+ target_float_convert (regval, regtype, readbuf, valtype);
}
if (writebuf)
{
- convert_typed_floating (writebuf, valtype, regval, regtype);
- regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
+ target_float_convert (writebuf, valtype, regval, regtype);
+ regcache->cooked_write (tdep->ppc_fp0_regnum + 1, regval);
}
return RETURN_VALUE_REGISTER_CONVENTION;
if (TYPE_LENGTH (valtype) == 8)
{
- gdb_assert (TYPE_CODE (valtype) != TYPE_CODE_FLT);
+ gdb_assert (valtype->code () != TYPE_CODE_FLT);
gdb_assert (tdep->wordsize == 4);
if (readbuf)
{
gdb_byte regval[8];
- regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, regval);
- regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
- regval + 4);
+ regcache->cooked_read (tdep->ppc_gp0_regnum + 3, regval);
+ regcache->cooked_read (tdep->ppc_gp0_regnum + 4, regval + 4);
memcpy (readbuf, regval, 8);
}
if (writebuf)
{
- regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
- regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
- writebuf + 4);
+ regcache->cooked_write (tdep->ppc_gp0_regnum + 3, writebuf);
+ regcache->cooked_write (tdep->ppc_gp0_regnum + 4, writebuf + 4);
}
return RETURN_VALUE_REGISTER_CONVENTION;
/* Support for CONVERT_FROM_FUNC_PTR_ADDR (ARCH, ADDR, TARG).
Usually a function pointer's representation is simply the address
- of the function. On the RS/6000 however, a function pointer is
- represented by a pointer to an OPD entry. This OPD entry contains
+ of the function. On the RS/6000 however, a function pointer is
+ represented by a pointer to an OPD entry. This OPD entry contains
three words, the first word is the address of the function, the
second word is the TOC pointer (r2), and the third word is the
static chain value. Throughout GDB it is currently assumed that a
the target address itself points to a section that is executable. */
if (s && (s->the_bfd_section->flags & SEC_CODE) == 0)
{
- CORE_ADDR pc;
+ CORE_ADDR pc = 0;
struct obj_section *pc_section;
- struct gdb_exception e;
- TRY_CATCH (e, RETURN_MASK_ERROR)
+ try
{
pc = read_memory_unsigned_integer (addr, tdep->wordsize, byte_order);
}
- if (e.reason < 0)
+ catch (const gdb_exception_error &e)
{
/* An error occured during reading. Probably a memory error
due to the section not being loaded yet. This address
cannot be a function descriptor. */
return addr;
}
+
pc_section = find_pc_section (pc);
if (pc_section && (pc_section->the_bfd_section->flags & SEC_CODE))
/* Calculate the destination of a branch/jump. Return -1 if not a branch. */
static CORE_ADDR
-branch_dest (struct frame_info *frame, int opcode, int instr,
+branch_dest (struct regcache *regcache, int opcode, int instr,
CORE_ADDR pc, CORE_ADDR safety)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
+ struct gdbarch *gdbarch = regcache->arch ();
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR dest;
if (ext_op == 16) /* br conditional register */
{
- dest = get_frame_register_unsigned (frame, tdep->ppc_lr_regnum) & ~3;
+ dest = regcache_raw_get_unsigned (regcache, tdep->ppc_lr_regnum) & ~3;
/* If we are about to return from a signal handler, dest is
something like 0x3c90. The current frame is a signal handler
caller frame, upon completion of the sigreturn system call
execution will return to the saved PC in the frame. */
if (dest < AIX_TEXT_SEGMENT_BASE)
- dest = read_memory_unsigned_integer
- (get_frame_base (frame) + SIG_FRAME_PC_OFFSET,
- tdep->wordsize, byte_order);
+ {
+ struct frame_info *frame = get_current_frame ();
+
+ dest = read_memory_unsigned_integer
+ (get_frame_base (frame) + SIG_FRAME_PC_OFFSET,
+ tdep->wordsize, byte_order);
+ }
}
else if (ext_op == 528) /* br cond to count reg */
{
- dest = get_frame_register_unsigned (frame, tdep->ppc_ctr_regnum) & ~3;
+ dest = regcache_raw_get_unsigned (regcache,
+ tdep->ppc_ctr_regnum) & ~3;
/* If we are about to execute a system call, dest is something
like 0x22fc or 0x3b00. Upon completion the system call
will return to the address in the link register. */
if (dest < AIX_TEXT_SEGMENT_BASE)
- dest = get_frame_register_unsigned (frame, tdep->ppc_lr_regnum) & ~3;
+ dest = regcache_raw_get_unsigned (regcache,
+ tdep->ppc_lr_regnum) & ~3;
}
else
return -1;
/* AIX does not support PT_STEP. Simulate it. */
-static int
-rs6000_software_single_step (struct frame_info *frame)
+static std::vector<CORE_ADDR>
+rs6000_software_single_step (struct regcache *regcache)
{
- struct gdbarch *gdbarch = get_frame_arch (frame);
- struct address_space *aspace = get_frame_address_space (frame);
+ struct gdbarch *gdbarch = regcache->arch ();
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int ii, insn;
CORE_ADDR loc;
CORE_ADDR breaks[2];
int opcode;
- loc = get_frame_pc (frame);
+ loc = regcache_read_pc (regcache);
insn = read_memory_integer (loc, 4, byte_order);
- if (ppc_deal_with_atomic_sequence (frame))
- return 1;
+ std::vector<CORE_ADDR> next_pcs = ppc_deal_with_atomic_sequence (regcache);
+ if (!next_pcs.empty ())
+ return next_pcs;
breaks[0] = loc + PPC_INSN_SIZE;
opcode = insn >> 26;
- breaks[1] = branch_dest (frame, opcode, insn, loc, breaks[0]);
+ breaks[1] = branch_dest (regcache, opcode, insn, loc, breaks[0]);
- /* Don't put two breakpoints on the same address. */
+ /* Don't put two breakpoints on the same address. */
if (breaks[1] == breaks[0])
breaks[1] = -1;
for (ii = 0; ii < 2; ++ii)
{
- /* ignore invalid breakpoint. */
+ /* ignore invalid breakpoint. */
if (breaks[ii] == -1)
continue;
- insert_single_step_breakpoint (gdbarch, aspace, breaks[ii]);
+
+ next_pcs.push_back (breaks[ii]);
}
- errno = 0; /* FIXME, don't ignore errors! */
+ errno = 0; /* FIXME, don't ignore errors! */
/* What errors? {read,write}_memory call error(). */
- return 1;
+ return next_pcs;
}
+/* Implement the "auto_wide_charset" gdbarch method for this platform. */
+
+static const char *
+rs6000_aix_auto_wide_charset (void)
+{
+ return "UTF-16";
+}
+
+/* Implement an osabi sniffer for RS6000/AIX.
+
+ This function assumes that ABFD's flavour is XCOFF. In other words,
+ it should be registered as a sniffer for bfd_target_xcoff_flavour
+ objfiles only. A failed assertion will be raised if this condition
+ is not met. */
+
static enum gdb_osabi
rs6000_aix_osabi_sniffer (bfd *abfd)
{
-
- if (bfd_get_flavour (abfd) == bfd_target_xcoff_flavour);
- return GDB_OSABI_AIX;
+ gdb_assert (bfd_get_flavour (abfd) == bfd_target_xcoff_flavour);
+
+ /* The only noticeable difference between Lynx178 XCOFF files and
+ AIX XCOFF files comes from the fact that there are no shared
+ libraries on Lynx178. On AIX, we are betting that an executable
+ linked with no shared library will never exist. */
+ if (xcoff_get_n_import_files (abfd) <= 0)
+ return GDB_OSABI_UNKNOWN;
- return GDB_OSABI_UNKNOWN;
+ return GDB_OSABI_AIX;
+}
+
+/* A structure encoding the offset and size of a field within
+ a struct. */
+
+struct field_info
+{
+ int offset;
+ int size;
+};
+
+/* A structure describing the layout of all the fields of interest
+ in AIX's struct ld_info. Each field in this struct corresponds
+ to the field of the same name in struct ld_info. */
+
+struct ld_info_desc
+{
+ struct field_info ldinfo_next;
+ struct field_info ldinfo_fd;
+ struct field_info ldinfo_textorg;
+ struct field_info ldinfo_textsize;
+ struct field_info ldinfo_dataorg;
+ struct field_info ldinfo_datasize;
+ struct field_info ldinfo_filename;
+};
+
+/* The following data has been generated by compiling and running
+ the following program on AIX 5.3. */
+
+#if 0
+#include <stddef.h>
+#include <stdio.h>
+#define __LDINFO_PTRACE32__
+#define __LDINFO_PTRACE64__
+#include <sys/ldr.h>
+
+#define pinfo(type,member) \
+ { \
+ struct type ldi = {0}; \
+ \
+ printf (" {%d, %d},\t/* %s */\n", \
+ offsetof (struct type, member), \
+ sizeof (ldi.member), \
+ #member); \
+ } \
+ while (0)
+
+int
+main (void)
+{
+ printf ("static const struct ld_info_desc ld_info32_desc =\n{\n");
+ pinfo (__ld_info32, ldinfo_next);
+ pinfo (__ld_info32, ldinfo_fd);
+ pinfo (__ld_info32, ldinfo_textorg);
+ pinfo (__ld_info32, ldinfo_textsize);
+ pinfo (__ld_info32, ldinfo_dataorg);
+ pinfo (__ld_info32, ldinfo_datasize);
+ pinfo (__ld_info32, ldinfo_filename);
+ printf ("};\n");
+
+ printf ("\n");
+
+ printf ("static const struct ld_info_desc ld_info64_desc =\n{\n");
+ pinfo (__ld_info64, ldinfo_next);
+ pinfo (__ld_info64, ldinfo_fd);
+ pinfo (__ld_info64, ldinfo_textorg);
+ pinfo (__ld_info64, ldinfo_textsize);
+ pinfo (__ld_info64, ldinfo_dataorg);
+ pinfo (__ld_info64, ldinfo_datasize);
+ pinfo (__ld_info64, ldinfo_filename);
+ printf ("};\n");
+
+ return 0;
+}
+#endif /* 0 */
+
+/* Layout of the 32bit version of struct ld_info. */
+
+static const struct ld_info_desc ld_info32_desc =
+{
+ {0, 4}, /* ldinfo_next */
+ {4, 4}, /* ldinfo_fd */
+ {8, 4}, /* ldinfo_textorg */
+ {12, 4}, /* ldinfo_textsize */
+ {16, 4}, /* ldinfo_dataorg */
+ {20, 4}, /* ldinfo_datasize */
+ {24, 2}, /* ldinfo_filename */
+};
+
+/* Layout of the 64bit version of struct ld_info. */
+
+static const struct ld_info_desc ld_info64_desc =
+{
+ {0, 4}, /* ldinfo_next */
+ {8, 4}, /* ldinfo_fd */
+ {16, 8}, /* ldinfo_textorg */
+ {24, 8}, /* ldinfo_textsize */
+ {32, 8}, /* ldinfo_dataorg */
+ {40, 8}, /* ldinfo_datasize */
+ {48, 2}, /* ldinfo_filename */
+};
+
+/* A structured representation of one entry read from the ld_info
+ binary data provided by the AIX loader. */
+
+struct ld_info
+{
+ ULONGEST next;
+ int fd;
+ CORE_ADDR textorg;
+ ULONGEST textsize;
+ CORE_ADDR dataorg;
+ ULONGEST datasize;
+ char *filename;
+ char *member_name;
+};
+
+/* Return a struct ld_info object corresponding to the entry at
+ LDI_BUF.
+
+ Note that the filename and member_name strings still point
+ to the data in LDI_BUF. So LDI_BUF must not be deallocated
+ while the struct ld_info object returned is in use. */
+
+static struct ld_info
+rs6000_aix_extract_ld_info (struct gdbarch *gdbarch,
+ const gdb_byte *ldi_buf)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ struct type *ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
+ const struct ld_info_desc desc
+ = tdep->wordsize == 8 ? ld_info64_desc : ld_info32_desc;
+ struct ld_info info;
+
+ info.next = extract_unsigned_integer (ldi_buf + desc.ldinfo_next.offset,
+ desc.ldinfo_next.size,
+ byte_order);
+ info.fd = extract_signed_integer (ldi_buf + desc.ldinfo_fd.offset,
+ desc.ldinfo_fd.size,
+ byte_order);
+ info.textorg = extract_typed_address (ldi_buf + desc.ldinfo_textorg.offset,
+ ptr_type);
+ info.textsize
+ = extract_unsigned_integer (ldi_buf + desc.ldinfo_textsize.offset,
+ desc.ldinfo_textsize.size,
+ byte_order);
+ info.dataorg = extract_typed_address (ldi_buf + desc.ldinfo_dataorg.offset,
+ ptr_type);
+ info.datasize
+ = extract_unsigned_integer (ldi_buf + desc.ldinfo_datasize.offset,
+ desc.ldinfo_datasize.size,
+ byte_order);
+ info.filename = (char *) ldi_buf + desc.ldinfo_filename.offset;
+ info.member_name = info.filename + strlen (info.filename) + 1;
+
+ return info;
+}
+
+/* Append to OBJSTACK an XML string description of the shared library
+ corresponding to LDI, following the TARGET_OBJECT_LIBRARIES_AIX
+ format. */
+
+static void
+rs6000_aix_shared_library_to_xml (struct ld_info *ldi,
+ struct obstack *obstack)
+{
+ obstack_grow_str (obstack, "<library name=\"");
+ std::string p = xml_escape_text (ldi->filename);
+ obstack_grow_str (obstack, p.c_str ());
+ obstack_grow_str (obstack, "\"");
+
+ if (ldi->member_name[0] != '\0')
+ {
+ obstack_grow_str (obstack, " member=\"");
+ p = xml_escape_text (ldi->member_name);
+ obstack_grow_str (obstack, p.c_str ());
+ obstack_grow_str (obstack, "\"");
+ }
+
+ obstack_grow_str (obstack, " text_addr=\"");
+ obstack_grow_str (obstack, core_addr_to_string (ldi->textorg));
+ obstack_grow_str (obstack, "\"");
+
+ obstack_grow_str (obstack, " text_size=\"");
+ obstack_grow_str (obstack, pulongest (ldi->textsize));
+ obstack_grow_str (obstack, "\"");
+
+ obstack_grow_str (obstack, " data_addr=\"");
+ obstack_grow_str (obstack, core_addr_to_string (ldi->dataorg));
+ obstack_grow_str (obstack, "\"");
+
+ obstack_grow_str (obstack, " data_size=\"");
+ obstack_grow_str (obstack, pulongest (ldi->datasize));
+ obstack_grow_str (obstack, "\"");
+
+ obstack_grow_str (obstack, "></library>");
+}
+
+/* Convert the ld_info binary data provided by the AIX loader into
+ an XML representation following the TARGET_OBJECT_LIBRARIES_AIX
+ format.
+
+ LDI_BUF is a buffer containing the ld_info data.
+ READBUF, OFFSET and LEN follow the same semantics as target_ops'
+ to_xfer_partial target_ops method.
+
+ If CLOSE_LDINFO_FD is nonzero, then this routine also closes
+ the ldinfo_fd file descriptor. This is useful when the ldinfo
+ data is obtained via ptrace, as ptrace opens a file descriptor
+ for each and every entry; but we cannot use this descriptor
+ as the consumer of the XML library list might live in a different
+ process. */
+
+ULONGEST
+rs6000_aix_ld_info_to_xml (struct gdbarch *gdbarch, const gdb_byte *ldi_buf,
+ gdb_byte *readbuf, ULONGEST offset, ULONGEST len,
+ int close_ldinfo_fd)
+{
+ struct obstack obstack;
+ const char *buf;
+ ULONGEST len_avail;
+
+ obstack_init (&obstack);
+ obstack_grow_str (&obstack, "<library-list-aix version=\"1.0\">\n");
+
+ while (1)
+ {
+ struct ld_info ldi = rs6000_aix_extract_ld_info (gdbarch, ldi_buf);
+
+ rs6000_aix_shared_library_to_xml (&ldi, &obstack);
+ if (close_ldinfo_fd)
+ close (ldi.fd);
+
+ if (!ldi.next)
+ break;
+ ldi_buf = ldi_buf + ldi.next;
+ }
+
+ obstack_grow_str0 (&obstack, "</library-list-aix>\n");
+
+ buf = (const char *) obstack_finish (&obstack);
+ len_avail = strlen (buf);
+ if (offset >= len_avail)
+ len= 0;
+ else
+ {
+ if (len > len_avail - offset)
+ len = len_avail - offset;
+ memcpy (readbuf, buf + offset, len);
+ }
+
+ obstack_free (&obstack, NULL);
+ return len;
+}
+
+/* Implement the core_xfer_shared_libraries_aix gdbarch method. */
+
+static ULONGEST
+rs6000_aix_core_xfer_shared_libraries_aix (struct gdbarch *gdbarch,
+ gdb_byte *readbuf,
+ ULONGEST offset,
+ ULONGEST len)
+{
+ struct bfd_section *ldinfo_sec;
+ int ldinfo_size;
+
+ ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
+ if (ldinfo_sec == NULL)
+ error (_("cannot find .ldinfo section from core file: %s"),
+ bfd_errmsg (bfd_get_error ()));
+ ldinfo_size = bfd_section_size (ldinfo_sec);
+
+ gdb::byte_vector ldinfo_buf (ldinfo_size);
+
+ if (! bfd_get_section_contents (core_bfd, ldinfo_sec,
+ ldinfo_buf.data (), 0, ldinfo_size))
+ error (_("unable to read .ldinfo section from core file: %s"),
+ bfd_errmsg (bfd_get_error ()));
+
+ return rs6000_aix_ld_info_to_xml (gdbarch, ldinfo_buf.data (), readbuf,
+ offset, len, 0);
}
static void
software single-stepping. */
set_gdbarch_displaced_step_copy_insn (gdbarch, NULL);
set_gdbarch_displaced_step_fixup (gdbarch, NULL);
- set_gdbarch_displaced_step_free_closure (gdbarch, NULL);
set_gdbarch_displaced_step_location (gdbarch, NULL);
set_gdbarch_push_dummy_call (gdbarch, rs6000_push_dummy_call);
(gdbarch, rs6000_convert_from_func_ptr_addr);
/* Core file support. */
- set_gdbarch_regset_from_core_section
- (gdbarch, rs6000_aix_regset_from_core_section);
+ set_gdbarch_iterate_over_regset_sections
+ (gdbarch, rs6000_aix_iterate_over_regset_sections);
+ set_gdbarch_core_xfer_shared_libraries_aix
+ (gdbarch, rs6000_aix_core_xfer_shared_libraries_aix);
if (tdep->wordsize == 8)
tdep->lr_frame_offset = 16;
set_gdbarch_frame_red_zone_size (gdbarch, 224);
else
set_gdbarch_frame_red_zone_size (gdbarch, 0);
-}
-/* Provide a prototype to silence -Wmissing-prototypes. */
-extern initialize_file_ftype _initialize_rs6000_aix_tdep;
+ if (tdep->wordsize == 8)
+ set_gdbarch_wchar_bit (gdbarch, 32);
+ else
+ set_gdbarch_wchar_bit (gdbarch, 16);
+ set_gdbarch_wchar_signed (gdbarch, 0);
+ set_gdbarch_auto_wide_charset (gdbarch, rs6000_aix_auto_wide_charset);
+
+ set_solib_ops (gdbarch, &solib_aix_so_ops);
+ frame_unwind_append_unwinder (gdbarch, &aix_sighandle_frame_unwind);
+}
+void _initialize_rs6000_aix_tdep ();
void
-_initialize_rs6000_aix_tdep (void)
+_initialize_rs6000_aix_tdep ()
{
gdbarch_register_osabi_sniffer (bfd_arch_rs6000,
bfd_target_xcoff_flavour,
projects / deliverable / binutils-gdb.git / blobdiff