/* Target-dependent code for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
+ Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996
Free Software Foundation, Inc.
This file is part of GDB.
#include "symtab.h"
#include "target.h"
#include "gdbcore.h"
-
+#include "symfile.h"
+#include "objfiles.h"
#include "xcoffsolib.h"
-#include <a.out.h>
-
extern struct obstack frame_cache_obstack;
extern int errno;
/* Static function prototypes */
-static CORE_ADDR
-find_toc_address PARAMS ((CORE_ADDR pc));
+static CORE_ADDR find_toc_address PARAMS ((CORE_ADDR pc));
-static CORE_ADDR
-branch_dest PARAMS ((int opcode, int instr, CORE_ADDR pc, CORE_ADDR safety));
+static CORE_ADDR branch_dest PARAMS ((int opcode, int instr, CORE_ADDR pc,
+ CORE_ADDR safety));
-static void
-frame_get_cache_fsr PARAMS ((struct frame_info *fi,
- struct rs6000_framedata *fdatap));
+static void frame_get_cache_fsr PARAMS ((struct frame_info *fi,
+ struct rs6000_framedata *fdatap));
+
+/* Calculate the destination of a branch/jump. Return -1 if not a branch. */
-/*
- * Calculate the destination of a branch/jump. Return -1 if not a branch.
- */
static CORE_ADDR
branch_dest (opcode, instr, pc, safety)
int opcode;
int cr_reg = 0;
int reg;
int framep = 0;
+ int minimal_toc_loaded = 0;
static struct rs6000_framedata zero_frame;
*fdata = zero_frame;
} else if ((op & 0xffff0000) == 0x3c000000) { /* addis 0,0,NUM, used for >= 32k frames */
fdata->offset = (op & 0x0000ffff) << 16;
+ fdata->frameless = 0;
continue;
} else if ((op & 0xffff0000) == 0x60000000) { /* ori 0,0,NUM, 2nd half of >= 32k frames */
fdata->offset |= (op & 0x0000ffff);
+ fdata->frameless = 0;
continue;
} else if ((op & 0xffff0000) == lr_reg) { /* st Rx,NUM(r1) where Rx == lr */
} else if (op == 0x48000005) { /* bl .+4 used in -mrelocatable */
continue;
+ } else if (op == 0x48000004) { /* b .+4 (xlc) */
+ break;
+
} else if (((op & 0xffff0000) == 0x801e0000 || /* lwz 0,NUM(r30), used in V.4 -mrelocatable */
op == 0x7fc0f214) && /* add r30,r0,r30, used in V.4 -mrelocatable */
lr_reg == 0x901e0000) {
} else if ((op & 0xfc000000) == 0x48000000) { /* bl foo, to save fprs??? */
+ fdata->frameless = 0;
/* Don't skip over the subroutine call if it is not within the first
three instructions of the prologue. */
if ((pc - orig_pc) > 8)
/* update stack pointer */
} else if ((op & 0xffff0000) == 0x94210000) { /* stu r1,NUM(r1) */
+ fdata->frameless = 0;
fdata->offset = SIGNED_SHORT (op);
offset = fdata->offset;
continue;
} else if (op == 0x7c21016e) { /* stwux 1,1,0 */
+ fdata->frameless = 0;
offset = fdata->offset;
continue;
/* Load up minimal toc pointer */
- } else if ((op >> 22) == 0x20f) { /* l r31,... or l r30,... */
+ } else if ((op >> 22) == 0x20f
+ && ! minimal_toc_loaded) { /* l r31,... or l r30,... */
+ minimal_toc_loaded = 1;
continue;
/* store parameters in stack */
/* Set up frame pointer */
} else if (op == 0x603f0000 /* oril r31, r1, 0x0 */
|| op == 0x7c3f0b78) { /* mr r31, r1 */
+ fdata->frameless = 0;
framep = 1;
fdata->alloca_reg = 31;
continue;
+ /* Another way to set up the frame pointer. */
+ } else if ((op & 0xfc1fffff) == 0x38010000) { /* addi rX, r1, 0x0 */
+ fdata->frameless = 0;
+ framep = 1;
+ fdata->alloca_reg = (op & ~0x38010000) >> 21;
+ continue;
+
} else {
break;
}
}
#endif /* 0 */
- fdata->frameless = (pc == orig_pc);
fdata->offset = - fdata->offset;
return pc;
}
/* Same thing, target byte order. */
char pc_targ[4];
+ /* Needed to figure out where to save the dummy link area.
+ FIXME: There should be an easier way to do this, no? tiemann 9/9/95. */
+ struct rs6000_framedata fdata;
+
int ii;
target_fetch_registers (-1);
pc = read_register(PC_REGNUM);
store_address (pc_targ, 4, pc);
+ (void) skip_prologue (get_pc_function_start (pc) + FUNCTION_START_OFFSET, &fdata);
+
dummy_frame_addr [dummy_frame_count++] = sp;
/* Be careful! If the stack pointer is not decremented first, then kernel
before writing register values into the new frame, decrement and update
%sp first in order to secure your frame. */
+ /* FIXME: We don't check if the stack really has this much space.
+ This is a problem on the ppc simulator (which only grants one page
+ (4096 bytes) by default. */
+
write_register (SP_REGNUM, sp-DUMMY_FRAME_SIZE);
/* gdb relies on the state of current_frame. We'd better update it,
flush_cached_frames ();
/* save program counter in link register's space. */
- write_memory (sp+8, pc_targ, 4);
+ write_memory (sp + (fdata.lr_offset ? fdata.lr_offset : DEFAULT_LR_SAVE),
+ pc_targ, 4);
/* save all floating point and general purpose registers here. */
®isters[REGISTER_BYTE (FPLAST_REGNUM + ii)], 4);
read_memory (sp-(DUMMY_FRAME_SIZE-8),
- ®isters [REGISTER_BYTE(PC_REGNUM)], 4);
+ ®isters [REGISTER_BYTE(PC_REGNUM)], 4);
/* when a dummy frame was being pushed, we had to decrement %sp first, in
order to secure astack space. Thus, saved %sp (or %r1) value, is not the
its argumets will be passed by gdb. */
void
-fix_call_dummy(dummyname, pc, fun, nargs, type)
- char *dummyname;
- CORE_ADDR pc;
- CORE_ADDR fun;
- int nargs; /* not used */
- int type; /* not used */
+fix_call_dummy (dummyname, pc, fun, nargs, type)
+ char *dummyname;
+ CORE_ADDR pc;
+ CORE_ADDR fun;
+ int nargs; /* not used */
+ int type; /* not used */
{
#define TOC_ADDR_OFFSET 20
#define TARGET_ADDR_OFFSET 28
*(int*)((char*)dummyname + TARGET_ADDR_OFFSET+4) = ii;
}
-/* Pass the arguments in either registers, or in the stack. In RS6000, 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..r11 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
+/* Pass the arguments in either registers, or in the stack. In RS6000,
+ 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..r11 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
stack.
If the function is returning a structure, then the return address is passed
CORE_ADDR
push_arguments (nargs, args, sp, struct_return, struct_addr)
- int nargs;
- value_ptr *args;
- CORE_ADDR sp;
- int struct_return;
- CORE_ADDR struct_addr;
+ int nargs;
+ value_ptr *args;
+ CORE_ADDR sp;
+ int struct_return;
+ CORE_ADDR struct_addr;
{
int ii, len;
int argno; /* current argument number */
int argbytes; /* current argument byte */
char tmp_buffer [50];
- value_ptr arg;
int f_argno = 0; /* current floating point argno */
+ value_ptr arg;
+ struct type *type;
CORE_ADDR saved_sp, pc;
for (argno=0, argbytes=0; argno < nargs && ii<8; ++ii) {
arg = args[argno];
- len = TYPE_LENGTH (VALUE_TYPE (arg));
+ type = check_typedef (VALUE_TYPE (arg));
+ len = TYPE_LENGTH (type);
- if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FLT) {
+ if (TYPE_CODE (type) == 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
if ((argno < nargs) || argbytes) {
int space = 0, jj;
- value_ptr val;
if (argbytes) {
space += ((len - argbytes + 3) & -4);
jj = argno;
for (; jj < nargs; ++jj) {
- val = args[jj];
+ value_ptr val = args[jj];
space += ((TYPE_LENGTH (VALUE_TYPE (val))) + 3) & -4;
}
for (; argno < nargs; ++argno) {
arg = args[argno];
- len = TYPE_LENGTH (VALUE_TYPE (arg));
+ type = check_typedef (VALUE_TYPE (arg));
+ len = TYPE_LENGTH (type);
/* float types should be passed in fpr's, as well as in the stack. */
- if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_FLT && f_argno < 13) {
+ if (TYPE_CODE (type) == TYPE_CODE_FLT && f_argno < 13) {
if (len > 8)
printf_unfiltered (
void
extract_return_value (valtype, regbuf, valbuf)
- struct type *valtype;
- char regbuf[REGISTER_BYTES];
- char *valbuf;
+ struct type *valtype;
+ char regbuf[REGISTER_BYTES];
+ char *valbuf;
{
int offset = 0;
CORE_ADDR
skip_trampoline_code (pc)
-CORE_ADDR pc;
+ CORE_ADDR pc;
{
register unsigned int ii, op;
CORE_ADDR solib_target_pc;
return pc;
}
-
/* Determines whether the function FI has a frame on the stack or not. */
+
int
frameless_function_invocation (fi)
struct frame_info *fi;
}
/* Return the PC saved in a frame */
+
unsigned long
frame_saved_pc (fi)
struct frame_info *fi;
}
-/* Note that this assumes that the "textorg" and "dataorg" elements
- of a member of this array are correlated with the "toc_offset"
- element of the same member. This is taken care of because the loops
- which assign the former (in xcoff_relocate_symtab or xcoff_relocate_core)
- and the latter (in scan_xcoff_symtab, via vmap_symtab, in vmap_ldinfo
- or xcoff_relocate_core) traverse the same objfiles in the same order. */
+/* Note that this assumes that the "textorg" and "dataorg" elements of
+ a member of this array are correlated with the "toc_offset" element
+ of the same member. This is taken care of because the loops which
+ assign the former (in xcoff_relocate_symtab or xcoff_relocate_core)
+ and the latter (in scan_xcoff_symtab, via vmap_symtab, in
+ vmap_ldinfo or xcoff_relocate_core) traverse the same objfiles in
+ the same order. */
static CORE_ADDR
find_toc_address (pc)
{
int ii, toc_entry, tocbase = 0;
+ toc_entry = -1;
for (ii=0; ii < loadinfotextindex; ++ii)
if (pc > loadinfo[ii].textorg && loadinfo[ii].textorg > tocbase) {
toc_entry = ii;
tocbase = loadinfo[ii].textorg;
}
+ if (toc_entry == -1)
+ error ("Unable to find TOC entry for pc 0x%x\n", pc);
return loadinfo[toc_entry].dataorg + loadinfo[toc_entry].toc_offset;
}
+/* Return nonzero if ADDR (a function pointer) is in the data space and
+ is therefore a special function pointer. */
+
+int
+is_magic_function_pointer (addr)
+ CORE_ADDR addr;
+{
+ struct obj_section *s;
+
+ s = find_pc_section (addr);
+ if (s && s->the_bfd_section->flags & SEC_CODE)
+ return 0;
+ else
+ return 1;
+}
+
#ifdef GDB_TARGET_POWERPC
int
gdb_print_insn_powerpc (memaddr, info)
void
_initialize_rs6000_tdep ()
{
+#ifndef ELF_OBJECT_FORMAT
+ {
+ extern void (*xcoff_add_toc_to_loadinfo_hook) PARAMS ((unsigned long));
+ extern void (*xcoff_init_loadinfo_hook) PARAMS ((void));
+
+ /* Initialize hook in xcoffread for recording the toc offset value
+ of a symbol table into the ldinfo structure, for native rs6000
+ config. */
+ xcoff_add_toc_to_loadinfo_hook = &xcoff_add_toc_to_loadinfo;
+
+ /* Initialize hook in xcoffread for calling xcoff_init_loadinfo in
+ a native rs6000 config. */
+ xcoff_init_loadinfo_hook = &xcoff_init_loadinfo;
+ }
+#endif /* ELF_OBJECT_FORMAT */
+
/* FIXME, this should not be decided via ifdef. */
#ifdef GDB_TARGET_POWERPC
tm_print_insn = gdb_print_insn_powerpc;
projects / deliverable / binutils-gdb.git / blobdiff