/* Target-dependent code for PowerPC systems using the SVR4 ABI
for GDB, the GNU debugger.
- Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
+ Copyright (C) 2000, 2001, 2002, 2003, 2005
+ Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "gdbcore.h"
#include "regcache.h"
#include "value.h"
#include "gdb_string.h"
-
+#include "gdb_assert.h"
#include "ppc-tdep.h"
+#include "target.h"
+#include "objfiles.h"
+#include "infcall.h"
/* 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
starting from r4. */
CORE_ADDR
-ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
+ppc_sysv_abi_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)
for (argno = 0; argno < nargs; argno++)
{
struct value *arg = args[argno];
- struct type *type = check_typedef (VALUE_TYPE (arg));
+ struct type *type = check_typedef (value_type (arg));
int len = TYPE_LENGTH (type);
- char *val = VALUE_CONTENTS (arg);
+ const bfd_byte *val = value_contents (arg);
if (TYPE_CODE (type) == TYPE_CODE_FLT
&& ppc_floating_point_unit_p (current_gdbarch) && len <= 8)
{
/* Always store the floating point value using
the register's floating-point format. */
- char regval[MAX_REGISTER_SIZE];
+ gdb_byte regval[MAX_REGISTER_SIZE];
struct type *regtype
- = register_type (gdbarch, FP0_REGNUM + freg);
+ = register_type (gdbarch, tdep->ppc_fp0_regnum + freg);
convert_typed_floating (val, type, regval, regtype);
- regcache_cooked_write (regcache, FP0_REGNUM + freg,
+ regcache_cooked_write (regcache,
+ tdep->ppc_fp0_regnum + freg,
regval);
}
freg++;
memtype = builtin_type_ieee_double_little;
break;
default:
- internal_error (__FILE__, __LINE__, "bad switch");
+ internal_error (__FILE__, __LINE__, _("bad switch"));
}
convert_typed_floating (val, type, memval, memtype);
write_memory (sp + argoffset, val, len);
{
/* Reduce the parameter down to something that fits in a
"word". */
- char word[MAX_REGISTER_SIZE];
+ gdb_byte word[MAX_REGISTER_SIZE];
memset (word, 0, MAX_REGISTER_SIZE);
if (len > tdep->wordsize
|| TYPE_CODE (type) == TYPE_CODE_STRUCT
/* Ensure that the stack is still 16 byte aligned. */
sp = align_down (sp, 16);
}
+
+ /* The psABI says that "A caller of a function that takes a
+ variable argument list shall set condition register bit 6 to
+ 1 if it passes one or more arguments in the floating-point
+ registers. It is strongly recommended that the caller set the
+ bit to 0 otherwise..." Doing this for normal functions too
+ shouldn't hurt. */
+ if (write_pass)
+ {
+ ULONGEST cr;
+
+ regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr);
+ if (freg > 1)
+ cr |= 0x02000000;
+ else
+ cr &= ~0x02000000;
+ regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr);
+ }
}
/* Update %sp. */
return sp;
}
-/* Structures 8 bytes or less long are returned in the r3 & r4
- registers, according to the SYSV ABI. */
-int
-ppc_sysv_abi_use_struct_convention (int gcc_p, struct type *value_type)
+/* Handle the return-value conventions specified by the SysV 32-bit
+ PowerPC ABI (including all the supplements):
+
+ no floating-point: floating-point values returned using 32-bit
+ general-purpose registers.
+
+ Altivec: 128-bit vectors returned using vector registers.
+
+ e500: 64-bit vectors returned using the full full 64 bit EV
+ register, floating-point values returned using 32-bit
+ general-purpose registers.
+
+ GCC (broken): Small struct values right (instead of left) aligned
+ when returned in general-purpose registers. */
+
+static enum return_value_convention
+do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, void *readbuf,
+ const void *writebuf, int broken_gcc)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ gdb_assert (tdep->wordsize == 4);
+ if (TYPE_CODE (type) == TYPE_CODE_FLT
+ && TYPE_LENGTH (type) <= 8
+ && ppc_floating_point_unit_p (gdbarch))
+ {
+ if (readbuf)
+ {
+ /* Floats and doubles stored in "f1". Convert the value to
+ the required type. */
+ gdb_byte regval[MAX_REGISTER_SIZE];
+ struct type *regtype = register_type (gdbarch,
+ tdep->ppc_fp0_regnum + 1);
+ regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
+ convert_typed_floating (regval, regtype, readbuf, type);
+ }
+ if (writebuf)
+ {
+ /* Floats and doubles stored in "f1". Convert the value to
+ the register's "double" type. */
+ gdb_byte regval[MAX_REGISTER_SIZE];
+ struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
+ convert_typed_floating (writebuf, type, regval, regtype);
+ regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8)
+ || (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8))
+ {
+ if (readbuf)
+ {
+ /* A long long, or a double stored in the 32 bit r3/r4. */
+ regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
+ (bfd_byte *) readbuf + 0);
+ regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
+ (bfd_byte *) readbuf + 4);
+ }
+ if (writebuf)
+ {
+ /* A long long, or a double stored in the 32 bit r3/r4. */
+ regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
+ (const bfd_byte *) writebuf + 0);
+ regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
+ (const bfd_byte *) writebuf + 4);
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ if (TYPE_CODE (type) == TYPE_CODE_INT
+ && TYPE_LENGTH (type) <= tdep->wordsize)
+ {
+ if (readbuf)
+ {
+ /* Some sort of integer stored in r3. Since TYPE isn't
+ bigger than the register, sign extension isn't a problem
+ - just do everything unsigned. */
+ ULONGEST regval;
+ regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
+ ®val);
+ store_unsigned_integer (readbuf, TYPE_LENGTH (type), regval);
+ }
+ if (writebuf)
+ {
+ /* Some sort of integer stored in r3. Use unpack_long since
+ that should handle any required sign extension. */
+ regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
+ unpack_long (type, writebuf));
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ if (TYPE_LENGTH (type) == 16
+ && TYPE_CODE (type) == TYPE_CODE_ARRAY
+ && TYPE_VECTOR (type) && tdep->ppc_vr0_regnum >= 0)
+ {
+ if (readbuf)
+ {
+ /* Altivec places the return value in "v2". */
+ regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
+ }
+ if (writebuf)
+ {
+ /* Altivec places the return value in "v2". */
+ regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ if (TYPE_LENGTH (type) == 8
+ && TYPE_CODE (type) == TYPE_CODE_ARRAY
+ && TYPE_VECTOR (type) && tdep->ppc_ev0_regnum >= 0)
+ {
+ /* The e500 ABI places return values for the 64-bit DSP types
+ (__ev64_opaque__) in r3. However, in GDB-speak, ev3
+ corresponds to the entire r3 value for e500, whereas GDB's r3
+ only corresponds to the least significant 32-bits. So place
+ the 64-bit DSP type's value in ev3. */
+ if (readbuf)
+ regcache_cooked_read (regcache, tdep->ppc_ev0_regnum + 3, readbuf);
+ if (writebuf)
+ regcache_cooked_write (regcache, tdep->ppc_ev0_regnum + 3, writebuf);
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ if (broken_gcc && TYPE_LENGTH (type) <= 8)
+ {
+ /* GCC screwed up for structures or unions whose size is less
+ than or equal to 8 bytes.. Instead of left-aligning, it
+ right-aligns the data into the buffer formed by r3, r4. */
+ gdb_byte regvals[MAX_REGISTER_SIZE * 2];
+ int len = TYPE_LENGTH (type);
+ int offset = (2 * tdep->wordsize - len) % tdep->wordsize;
+
+ if (readbuf)
+ {
+ regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
+ regvals + 0 * tdep->wordsize);
+ if (len > tdep->wordsize)
+ regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
+ regvals + 1 * tdep->wordsize);
+ memcpy (readbuf, regvals + offset, len);
+ }
+ if (writebuf)
+ {
+ memset (regvals, 0, sizeof regvals);
+ memcpy (regvals + offset, writebuf, len);
+ regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
+ regvals + 0 * tdep->wordsize);
+ if (len > tdep->wordsize)
+ regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
+ regvals + 1 * tdep->wordsize);
+ }
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ if (TYPE_LENGTH (type) <= 8)
+ {
+ if (readbuf)
+ {
+ /* This matches SVr4 PPC, it does not match GCC. */
+ /* The value is right-padded to 8 bytes and then loaded, as
+ two "words", into r3/r4. */
+ gdb_byte regvals[MAX_REGISTER_SIZE * 2];
+ regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3,
+ regvals + 0 * tdep->wordsize);
+ if (TYPE_LENGTH (type) > tdep->wordsize)
+ regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4,
+ regvals + 1 * tdep->wordsize);
+ memcpy (readbuf, regvals, TYPE_LENGTH (type));
+ }
+ if (writebuf)
+ {
+ /* This matches SVr4 PPC, it does not match GCC. */
+ /* The value is padded out to 8 bytes and then loaded, as
+ two "words" into r3/r4. */
+ gdb_byte regvals[MAX_REGISTER_SIZE * 2];
+ memset (regvals, 0, sizeof regvals);
+ memcpy (regvals, writebuf, TYPE_LENGTH (type));
+ regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3,
+ regvals + 0 * tdep->wordsize);
+ if (TYPE_LENGTH (type) > tdep->wordsize)
+ regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4,
+ regvals + 1 * tdep->wordsize);
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ return RETURN_VALUE_STRUCT_CONVENTION;
+}
+
+enum return_value_convention
+ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype,
+ struct regcache *regcache, gdb_byte *readbuf,
+ const gdb_byte *writebuf)
+{
+ return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf,
+ writebuf, 0);
+}
+
+enum return_value_convention
+ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch,
+ struct type *valtype,
+ struct regcache *regcache,
+ gdb_byte *readbuf, const gdb_byte *writebuf)
+{
+ return do_ppc_sysv_return_value (gdbarch, valtype, regcache, readbuf,
+ writebuf, 1);
+}
+
+/* The helper function for 64-bit SYSV push_dummy_call. Converts the
+ function's code address back into the function's descriptor
+ address.
+
+ Find a value for the TOC register. Every symbol should have both
+ ".FN" and "FN" in the minimal symbol table. "FN" points at the
+ FN's descriptor, while ".FN" points at the entry point (which
+ matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the
+ FN's descriptor address (while at the same time being careful to
+ find "FN" in the same object file as ".FN"). */
+
+static int
+convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr)
{
- if ((TYPE_LENGTH (value_type) == 16 || TYPE_LENGTH (value_type) == 8)
- && TYPE_VECTOR (value_type))
+ struct obj_section *dot_fn_section;
+ struct minimal_symbol *dot_fn;
+ struct minimal_symbol *fn;
+ CORE_ADDR toc;
+ /* Find the minimal symbol that corresponds to CODE_ADDR (should
+ have a name of the form ".FN"). */
+ dot_fn = lookup_minimal_symbol_by_pc (code_addr);
+ if (dot_fn == NULL || SYMBOL_LINKAGE_NAME (dot_fn)[0] != '.')
+ return 0;
+ /* Get the section that contains CODE_ADDR. Need this for the
+ "objfile" that it contains. */
+ dot_fn_section = find_pc_section (code_addr);
+ if (dot_fn_section == NULL || dot_fn_section->objfile == NULL)
return 0;
+ /* Now find the corresponding "FN" (dropping ".") minimal symbol's
+ address. Only look for the minimal symbol in ".FN"'s object file
+ - avoids problems when two object files (i.e., shared libraries)
+ contain a minimal symbol with the same name. */
+ fn = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (dot_fn) + 1, NULL,
+ dot_fn_section->objfile);
+ if (fn == NULL)
+ return 0;
+ /* Found a descriptor. */
+ (*desc_addr) = SYMBOL_VALUE_ADDRESS (fn);
+ return 1;
+}
- return (TYPE_LENGTH (value_type) > 8);
+/* Pass the arguments in either registers, or in the stack. Using the
+ ppc 64 bit SysV ABI.
+
+ This implements a dumbed down version of the ABI. It always writes
+ values to memory, GPR and FPR, even when not necessary. Doing this
+ greatly simplifies the logic. */
+
+CORE_ADDR
+ppc64_sysv_abi_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)
+{
+ CORE_ADDR func_addr = find_function_addr (function, NULL);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ /* By this stage in the proceedings, SP has been decremented by "red
+ zone size" + "struct return size". Fetch the stack-pointer from
+ before this and use that as the BACK_CHAIN. */
+ const CORE_ADDR back_chain = read_sp ();
+ /* See for-loop comment below. */
+ int write_pass;
+ /* Size of the Altivec's vector parameter region, the final value is
+ computed in the for-loop below. */
+ LONGEST vparam_size = 0;
+ /* Size of the general parameter region, the final value is computed
+ in the for-loop below. */
+ LONGEST gparam_size = 0;
+ /* Kevin writes ... I don't mind seeing tdep->wordsize used in the
+ calls to align_up(), align_down(), etc. because this makes it
+ easier to reuse this code (in a copy/paste sense) in the future,
+ but it is a 64-bit ABI and asserting that the wordsize is 8 bytes
+ at some point makes it easier to verify that this function is
+ correct without having to do a non-local analysis to figure out
+ the possible values of tdep->wordsize. */
+ gdb_assert (tdep->wordsize == 8);
+
+ /* Go through the argument list twice.
+
+ Pass 1: Compute the function call's stack space and register
+ requirements.
+
+ Pass 2: Replay the same computation but this time also write the
+ values out to the target. */
+
+ for (write_pass = 0; write_pass < 2; write_pass++)
+ {
+ int argno;
+ /* Next available floating point register for float and double
+ arguments. */
+ int freg = 1;
+ /* Next available general register for non-vector (but possibly
+ float) arguments. */
+ int greg = 3;
+ /* Next available vector register for vector arguments. */
+ int vreg = 2;
+ /* The address, at which the next general purpose parameter
+ (integer, struct, float, ...) should be saved. */
+ CORE_ADDR gparam;
+ /* Address, at which the next Altivec vector parameter should be
+ saved. */
+ CORE_ADDR vparam;
+
+ if (!write_pass)
+ {
+ /* During the first pass, GPARAM and VPARAM are more like
+ offsets (start address zero) than addresses. That way
+ the accumulate the total stack space each region
+ requires. */
+ gparam = 0;
+ vparam = 0;
+ }
+ else
+ {
+ /* Decrement the stack pointer making space for the Altivec
+ and general on-stack parameters. Set vparam and gparam
+ to their corresponding regions. */
+ vparam = align_down (sp - vparam_size, 16);
+ gparam = align_down (vparam - gparam_size, 16);
+ /* Add in space for the TOC, link editor double word,
+ compiler double word, LR save area, CR save area. */
+ sp = align_down (gparam - 48, 16);
+ }
+
+ /* If the function is returning a `struct', then there is an
+ extra hidden parameter (which will be passed in r3)
+ containing the address of that struct.. In that case we
+ should advance one word and start from r4 register to copy
+ parameters. This also consumes one on-stack parameter slot. */
+ if (struct_return)
+ {
+ if (write_pass)
+ regcache_cooked_write_signed (regcache,
+ tdep->ppc_gp0_regnum + greg,
+ struct_addr);
+ greg++;
+ gparam = align_up (gparam + tdep->wordsize, tdep->wordsize);
+ }
+
+ for (argno = 0; argno < nargs; argno++)
+ {
+ struct value *arg = args[argno];
+ struct type *type = check_typedef (value_type (arg));
+ const bfd_byte *val = value_contents (arg);
+ if (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) <= 8)
+ {
+ /* Floats and Doubles go in f1 .. f13. They also
+ consume a left aligned GREG,, and can end up in
+ memory. */
+ if (write_pass)
+ {
+ if (ppc_floating_point_unit_p (current_gdbarch)
+ && freg <= 13)
+ {
+ gdb_byte regval[MAX_REGISTER_SIZE];
+ struct type *regtype
+ = register_type (gdbarch, tdep->ppc_fp0_regnum);
+ convert_typed_floating (val, type, regval, regtype);
+ regcache_cooked_write (regcache,
+ tdep->ppc_fp0_regnum + freg,
+ regval);
+ }
+ if (greg <= 10)
+ {
+ /* The ABI states "Single precision floating
+ point values are mapped to the first word in
+ a single doubleword" and "... floating point
+ values mapped to the first eight doublewords
+ of the parameter save area are also passed in
+ general registers").
+
+ This code interprets that to mean: store it,
+ left aligned, in the general register. */
+ gdb_byte regval[MAX_REGISTER_SIZE];
+ memset (regval, 0, sizeof regval);
+ memcpy (regval, val, TYPE_LENGTH (type));
+ regcache_cooked_write (regcache,
+ tdep->ppc_gp0_regnum + greg,
+ regval);
+ }
+ write_memory (gparam, val, TYPE_LENGTH (type));
+ }
+ /* Always consume parameter stack space. */
+ freg++;
+ greg++;
+ gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
+ }
+ else if (TYPE_LENGTH (type) == 16 && TYPE_VECTOR (type)
+ && TYPE_CODE (type) == TYPE_CODE_ARRAY
+ && tdep->ppc_vr0_regnum >= 0)
+ {
+ /* In the Altivec ABI, vectors go in the vector
+ registers v2 .. v13, or when that runs out, a vector
+ annex which goes above all the normal parameters.
+ NOTE: cagney/2003-09-21: This is a guess based on the
+ PowerOpen Altivec ABI. */
+ if (vreg <= 13)
+ {
+ if (write_pass)
+ regcache_cooked_write (regcache,
+ tdep->ppc_vr0_regnum + vreg, val);
+ vreg++;
+ }
+ else
+ {
+ if (write_pass)
+ write_memory (vparam, val, TYPE_LENGTH (type));
+ vparam = align_up (vparam + TYPE_LENGTH (type), 16);
+ }
+ }
+ else if ((TYPE_CODE (type) == TYPE_CODE_INT
+ || TYPE_CODE (type) == TYPE_CODE_ENUM
+ || TYPE_CODE (type) == TYPE_CODE_PTR)
+ && TYPE_LENGTH (type) <= 8)
+ {
+ /* Scalars and Pointers get sign[un]extended and go in
+ gpr3 .. gpr10. They can also end up in memory. */
+ if (write_pass)
+ {
+ /* Sign extend the value, then store it unsigned. */
+ ULONGEST word = unpack_long (type, val);
+ /* Convert any function code addresses into
+ descriptors. */
+ if (TYPE_CODE (type) == TYPE_CODE_PTR
+ && TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC)
+ {
+ CORE_ADDR desc = word;
+ convert_code_addr_to_desc_addr (word, &desc);
+ word = desc;
+ }
+ if (greg <= 10)
+ regcache_cooked_write_unsigned (regcache,
+ tdep->ppc_gp0_regnum +
+ greg, word);
+ write_memory_unsigned_integer (gparam, tdep->wordsize,
+ word);
+ }
+ greg++;
+ gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
+ }
+ else
+ {
+ int byte;
+ for (byte = 0; byte < TYPE_LENGTH (type);
+ byte += tdep->wordsize)
+ {
+ if (write_pass && greg <= 10)
+ {
+ gdb_byte regval[MAX_REGISTER_SIZE];
+ int len = TYPE_LENGTH (type) - byte;
+ if (len > tdep->wordsize)
+ len = tdep->wordsize;
+ memset (regval, 0, sizeof regval);
+ /* WARNING: cagney/2003-09-21: As best I can
+ tell, the ABI specifies that the value should
+ be left aligned. Unfortunately, GCC doesn't
+ do this - it instead right aligns even sized
+ values and puts odd sized values on the
+ stack. Work around that by putting both a
+ left and right aligned value into the
+ register (hopefully no one notices :-^).
+ Arrrgh! */
+ /* Left aligned (8 byte values such as pointers
+ fill the buffer). */
+ memcpy (regval, val + byte, len);
+ /* Right aligned (but only if even). */
+ if (len == 1 || len == 2 || len == 4)
+ memcpy (regval + tdep->wordsize - len,
+ val + byte, len);
+ regcache_cooked_write (regcache, greg, regval);
+ }
+ greg++;
+ }
+ if (write_pass)
+ /* WARNING: cagney/2003-09-21: Strictly speaking, this
+ isn't necessary, unfortunately, GCC appears to get
+ "struct convention" parameter passing wrong putting
+ odd sized structures in memory instead of in a
+ register. Work around this by always writing the
+ value to memory. Fortunately, doing this
+ simplifies the code. */
+ write_memory (gparam, val, TYPE_LENGTH (type));
+ if (write_pass)
+ /* WARNING: cagney/2004-06-20: It appears that GCC
+ likes to put structures containing a single
+ floating-point member in an FP register instead of
+ general general purpose. */
+ /* Always consume parameter stack space. */
+ gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
+ }
+ }
+
+ if (!write_pass)
+ {
+ /* Save the true region sizes ready for the second pass. */
+ vparam_size = vparam;
+ /* Make certain that the general parameter save area is at
+ least the minimum 8 registers (or doublewords) in size. */
+ if (greg < 8)
+ gparam_size = 8 * tdep->wordsize;
+ else
+ gparam_size = gparam;
+ }
+ }
+
+ /* Update %sp. */
+ regcache_cooked_write_signed (regcache, SP_REGNUM, sp);
+
+ /* Write the backchain (it occupies WORDSIZED bytes). */
+ write_memory_signed_integer (sp, tdep->wordsize, back_chain);
+
+ /* Point the inferior function call's return address at the dummy's
+ breakpoint. */
+ regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr);
+
+ /* Use the func_addr to find the descriptor, and use that to find
+ the TOC. */
+ {
+ CORE_ADDR desc_addr;
+ if (convert_code_addr_to_desc_addr (func_addr, &desc_addr))
+ {
+ /* The TOC is the second double word in the descriptor. */
+ CORE_ADDR toc =
+ read_memory_unsigned_integer (desc_addr + tdep->wordsize,
+ tdep->wordsize);
+ regcache_cooked_write_unsigned (regcache,
+ tdep->ppc_gp0_regnum + 2, toc);
+ }
+ }
+
+ return sp;
}
0 if the return-value is instead stored on the stack (a.k.a.,
struct return convention).
- For a return-value stored in a register: when INVAL is non-NULL,
+ For a return-value stored in a register: when WRITEBUF is non-NULL,
copy the buffer to the corresponding register return-value location
- location; when OUTVAL is non-NULL, fill the buffer from the
+ location; when READBUF is non-NULL, fill the buffer from the
corresponding register return-value location. */
-
-/* Potential ways that a function can return a value of a given type. */
enum return_value_convention
+ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *valtype,
+ struct regcache *regcache, gdb_byte *readbuf,
+ const gdb_byte *writebuf)
{
- /* Where the return value has been squeezed into one or more
- registers. */
- RETURN_VALUE_REGISTER_CONVENTION,
- /* Commonly known as the "struct return convention". The caller
- passes an additional hidden first parameter to the caller. That
- parameter contains the address at which the value being returned
- should be stored. While typically, and historically, used for
- large structs, this is convention is applied to values of many
- different types. */
- RETURN_VALUE_STRUCT_CONVENTION
-};
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* This function exists to support a calling convention that
+ requires floating-point registers. It shouldn't be used on
+ processors that lack them. */
+ gdb_assert (ppc_floating_point_unit_p (gdbarch));
-static enum return_value_convention
-ppc64_sysv_abi_return_value (struct type *valtype, struct regcache *regcache,
- const void *inval, void *outval)
-{
- struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
/* Floats and doubles in F1. */
if (TYPE_CODE (valtype) == TYPE_CODE_FLT && TYPE_LENGTH (valtype) <= 8)
{
- char regval[MAX_REGISTER_SIZE];
- struct type *regtype = register_type (current_gdbarch, FP0_REGNUM);
- if (inval != NULL)
+ gdb_byte regval[MAX_REGISTER_SIZE];
+ struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum);
+ if (writebuf != NULL)
{
- convert_typed_floating (inval, valtype, regval, regtype);
- regcache_cooked_write (regcache, FP0_REGNUM + 1, regval);
+ convert_typed_floating (writebuf, valtype, regval, regtype);
+ regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval);
}
- if (outval != NULL)
+ if (readbuf != NULL)
{
- regcache_cooked_read (regcache, FP0_REGNUM + 1, regval);
- convert_typed_floating (regval, regtype, outval, valtype);
+ regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval);
+ convert_typed_floating (regval, regtype, readbuf, valtype);
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
- if (TYPE_CODE (valtype) == TYPE_CODE_INT && TYPE_LENGTH (valtype) <= 8)
+ /* Integers in r3. */
+ if ((TYPE_CODE (valtype) == TYPE_CODE_INT
+ || TYPE_CODE (valtype) == TYPE_CODE_ENUM)
+ && TYPE_LENGTH (valtype) <= 8)
{
- /* Integers in r3. */
- if (inval != NULL)
+ if (writebuf != NULL)
{
/* Be careful to sign extend the value. */
regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
- unpack_long (valtype, inval));
+ unpack_long (valtype, writebuf));
}
- if (outval != NULL)
+ if (readbuf != NULL)
{
/* Extract the integer from r3. Since this is truncating the
value, there isn't a sign extension problem. */
ULONGEST regval;
regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
®val);
- store_unsigned_integer (outval, TYPE_LENGTH (valtype), regval);
+ store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), regval);
}
return RETURN_VALUE_REGISTER_CONVENTION;
}
if (TYPE_CODE (valtype) == TYPE_CODE_PTR)
{
/* All pointers live in r3. */
- if (inval != NULL)
- regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, inval);
- if (outval != NULL)
- regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, outval);
+ if (writebuf != NULL)
+ regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf);
+ if (readbuf != NULL)
+ regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf);
return RETURN_VALUE_REGISTER_CONVENTION;
}
- if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY
- && TYPE_LENGTH (valtype) <= 8
- && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT
- && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1)
+ /* Array type has more than one use. */
+ if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY)
{
/* Small character arrays are returned, right justified, in r3. */
- int offset = (register_size (current_gdbarch, tdep->ppc_gp0_regnum + 3)
- - TYPE_LENGTH (valtype));
- if (inval != NULL)
- regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3,
- offset, TYPE_LENGTH (valtype), inval);
- if (outval != NULL)
- regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3,
- offset, TYPE_LENGTH (valtype), outval);
- return RETURN_VALUE_REGISTER_CONVENTION;
+ if (TYPE_LENGTH (valtype) <= 8
+ && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT
+ && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1)
+ {
+ int offset = (register_size (gdbarch, tdep->ppc_gp0_regnum + 3)
+ - TYPE_LENGTH (valtype));
+ if (writebuf != NULL)
+ regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3,
+ offset, TYPE_LENGTH (valtype), writebuf);
+ if (readbuf != NULL)
+ regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3,
+ offset, TYPE_LENGTH (valtype), readbuf);
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ /* A VMX vector is returned in v2. */
+ if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY
+ && TYPE_VECTOR (valtype) && tdep->ppc_vr0_regnum >= 0)
+ {
+ if (readbuf)
+ regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf);
+ if (writebuf)
+ regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf);
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
}
/* Big floating point values get stored in adjacent floating
- point registers. */
+ point registers, starting with F1. */
if (TYPE_CODE (valtype) == TYPE_CODE_FLT
&& (TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 32))
{
- if (inval || outval != NULL)
+ if (writebuf || readbuf != NULL)
{
int i;
for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++)
{
- if (inval != NULL)
- regcache_cooked_write (regcache, FP0_REGNUM + 1 + i,
- (const bfd_byte *) inval + i * 8);
- if (outval != NULL)
- regcache_cooked_read (regcache, FP0_REGNUM + 1 + i,
- (bfd_byte *) outval + i * 8);
+ if (writebuf != NULL)
+ regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i,
+ (const bfd_byte *) writebuf + i * 8);
+ if (readbuf != NULL)
+ regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i,
+ (bfd_byte *) readbuf + i * 8);
}
}
return RETURN_VALUE_REGISTER_CONVENTION;
int i;
for (i = 0; i < 2; i++)
{
- char regval[MAX_REGISTER_SIZE];
+ gdb_byte regval[MAX_REGISTER_SIZE];
struct type *regtype =
- register_type (current_gdbarch, FP0_REGNUM);
- if (inval != NULL)
+ register_type (current_gdbarch, tdep->ppc_fp0_regnum);
+ if (writebuf != NULL)
{
- convert_typed_floating ((const bfd_byte *) inval +
+ convert_typed_floating ((const bfd_byte *) writebuf +
i * (TYPE_LENGTH (valtype) / 2),
valtype, regval, regtype);
- regcache_cooked_write (regcache, FP0_REGNUM + 1 + i,
+ regcache_cooked_write (regcache,
+ tdep->ppc_fp0_regnum + 1 + i,
regval);
}
- if (outval != NULL)
+ if (readbuf != NULL)
{
- regcache_cooked_read (regcache, FP0_REGNUM + 1 + i, regval);
+ regcache_cooked_read (regcache,
+ tdep->ppc_fp0_regnum + 1 + i,
+ regval);
convert_typed_floating (regval, regtype,
- (bfd_byte *) outval +
+ (bfd_byte *) readbuf +
i * (TYPE_LENGTH (valtype) / 2),
valtype);
}
int i;
for (i = 0; i < 4; i++)
{
- if (inval != NULL)
- regcache_cooked_write (regcache, FP0_REGNUM + 1 + i,
- (const bfd_byte *) inval + i * 8);
- if (outval != NULL)
- regcache_cooked_read (regcache, FP0_REGNUM + 1 + i,
- (bfd_byte *) outval + i * 8);
+ if (writebuf != NULL)
+ regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i,
+ (const bfd_byte *) writebuf + i * 8);
+ if (readbuf != NULL)
+ regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i,
+ (bfd_byte *) readbuf + i * 8);
}
}
return RETURN_VALUE_REGISTER_CONVENTION;
return RETURN_VALUE_STRUCT_CONVENTION;
}
-int
-ppc64_sysv_abi_use_struct_convention (int gcc_p, struct type *value_type)
-{
- return (ppc64_sysv_abi_return_value (value_type, NULL, NULL, NULL)
- == RETURN_VALUE_STRUCT_CONVENTION);
-}
-
-void
-ppc64_sysv_abi_extract_return_value (struct type *valtype,
- struct regcache *regbuf, void *valbuf)
-{
- if (ppc64_sysv_abi_return_value (valtype, regbuf, NULL, valbuf)
- != RETURN_VALUE_REGISTER_CONVENTION)
- error ("Function return value unknown");
-}
-
-void
-ppc64_sysv_abi_store_return_value (struct type *valtype,
- struct regcache *regbuf,
- const void *valbuf)
+CORE_ADDR
+ppc64_sysv_abi_adjust_breakpoint_address (struct gdbarch *gdbarch,
+ CORE_ADDR bpaddr)
{
- if (!ppc64_sysv_abi_return_value (valtype, regbuf, valbuf, NULL))
- error ("Function return value location unknown");
+ /* PPC64 SYSV specifies that the minimal-symbol "FN" should point at
+ a function-descriptor while the corresponding minimal-symbol
+ ".FN" should point at the entry point. Consequently, a command
+ like "break FN" applied to an object file with only minimal
+ symbols, will insert the breakpoint into the descriptor at "FN"
+ and not the function at ".FN". Avoid this confusion by adjusting
+ any attempt to set a descriptor breakpoint into a corresponding
+ function breakpoint. Note that GDB warns the user when this
+ adjustment is applied - that's ok as otherwise the user will have
+ no way of knowing why their breakpoint at "FN" resulted in the
+ program stopping at ".FN". */
+ return gdbarch_convert_from_func_ptr_addr (gdbarch, bpaddr, ¤t_target);
}
projects / deliverable / binutils-gdb.git / blobdiff