/* 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.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
#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));
+
+static void pop_dummy_frame PARAMS ((void));
+
+/* 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;
CORE_ADDR pc;
CORE_ADDR safety;
{
- register long offset;
CORE_ADDR dest;
int immediate;
int absolute;
void
single_step (signal)
- int signal;
+ enum target_signal signal;
{
#define INSNLEN(OPCODE) 4
CORE_ADDR orig_pc = pc;
char buf[4];
unsigned long op;
+ long offset = 0;
int lr_reg = 0;
int cr_reg = 0;
int reg;
+ int framep = 0;
+ int minimal_toc_loaded = 0;
static struct rs6000_framedata zero_frame;
*fdata = zero_frame;
reg = GET_SRC_REG (op);
if (fdata->saved_fpr == -1 || fdata->saved_fpr > reg) {
fdata->saved_fpr = reg;
- fdata->fpr_offset = SIGNED_SHORT (op);
+ fdata->fpr_offset = SIGNED_SHORT (op) + offset;
}
continue;
reg = GET_SRC_REG (op);
if (fdata->saved_gpr == -1 || fdata->saved_gpr > reg) {
fdata->saved_gpr = reg;
- fdata->gpr_offset = SIGNED_SHORT (op);
+ fdata->gpr_offset = SIGNED_SHORT (op) + offset;
}
continue;
} 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 */
- fdata->lr_offset = SIGNED_SHORT (op);
+ fdata->lr_offset = SIGNED_SHORT (op) + offset;
fdata->nosavedpc = 0;
lr_reg = 0;
continue;
} else if ((op & 0xffff0000) == cr_reg) { /* st Rx,NUM(r1) where Rx == cr */
- fdata->cr_offset = SIGNED_SHORT (op);
+ fdata->cr_offset = SIGNED_SHORT (op) + offset;
cr_reg = 0;
continue;
+ } 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) {
+ continue;
+
+ } else if ((op & 0xffff0000) == 0x3fc00000 || /* addis 30,0,foo@ha, used in V.4 -mminimal-toc */
+ (op & 0xffff0000) == 0x3bde0000) { /* addi 30,30,foo@l */
+ continue;
+
} 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)
+ break;
+
op = read_memory_integer (pc+4, 4);
/* At this point, make sure this is not a trampoline function
prologue. */
if (op == 0x4def7b82 || op == 0) /* crorc 15, 15, 15 */
- return pc; /* don't skip over this branch */
+ break; /* don't skip over this branch */
continue;
+ /* update stack pointer */
} else if ((op & 0xffff0000) == 0x94210000) { /* stu r1,NUM(r1) */
- fdata->offset = - SIGNED_SHORT (op);
- pc += 4;
- op = read_memory_integer (pc, 4);
- break;
+ fdata->frameless = 0;
+ fdata->offset = SIGNED_SHORT (op);
+ offset = fdata->offset;
+ continue;
} else if (op == 0x7c21016e) { /* stwux 1,1,0 */
- pc += 4; /* offset set above */
- op = read_memory_integer (pc, 4);
- break;
+ fdata->frameless = 0;
+ offset = fdata->offset;
+ continue;
- } else {
- break;
- }
- }
+ /* Load up minimal toc pointer */
+ } else if ((op >> 22) == 0x20f
+ && ! minimal_toc_loaded) { /* l r31,... or l r30,... */
+ minimal_toc_loaded = 1;
+ continue;
- /* Skip -mreloctable (V.4/eabi) load up the toc case */
- if (op == 0x48000005 && /* bl .+4 */
- read_memory_integer (pc+4, 4) == 0x7fc802a6 && /* mflr r30 */
- (read_memory_integer (pc+8, 4) & 0xffff) == 0x801e0000 && /* lwz 0,NUM(r30) */
- read_memory_integer (pc+12, 4) == 0x7fc0f214) { /* add r30,r0,r30 */
- pc += 16;
- op = read_memory_integer (pc, 4);
-
- /* And -mminimal-toc code on V.4 */
- } else if ((op & 0xffff0000) == 0x3fc00000 && /* addis 30,0,foo@ha */
- /* addi 30,30,foo@l */
- ((read_memory_integer (pc+4, 4) & 0xffff0000) == 0x3bde0000)) {
- pc += 8;
- op = read_memory_integer (pc, 8);
- }
+ /* store parameters in stack */
+ } else if ((op & 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
+ (op & 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
+ (op & 0xfc1f0000) == 0xfc010000) { /* frsp, fp?,NUM(r1) */
+ continue;
- while ((op >> 22) == 0x20f) { /* l r31, ... or */
- pc += 4; /* l r30, ... */
- op = read_memory_integer (pc, 4);
- }
+ /* store parameters in stack via frame pointer */
+ } else if (framep &&
+ ((op & 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
+ (op & 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
+ (op & 0xfc1f0000) == 0xfc1f0000)) { /* frsp, fp?,NUM(r1) */
+ continue;
- /* store parameters into stack */
- while(
- (op & 0xfc1f0000) == 0x90010000 || /* st rx,NUM(r1) */
- (op & 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
- (op & 0xfc1f0000) == 0xfc010000) { /* frsp, fp?,NUM(r1) */
- pc += 4;
- op = read_memory_integer (pc, 4);
- }
+ /* 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;
- /* Set up frame pointer */
- if (op == 0x603f0000 /* oril r31, r1, 0x0 */
- || op == 0x7c3f0b78) { /* mr r31, r1 */
- pc += 4; /* this happens if r31 is used as */
- op = read_memory_integer (pc, 4); /* frame ptr. (gcc does that) */
-
- /* store parameters into frame */
- while (
- (op & 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r1) */
- (op & 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r1) */
- (op & 0xfc1f0000) == 0xfc1f0000) { /* frsp, fp?,NUM(r1) */
- pc += 4;
- op = read_memory_integer (pc, 4);
+ /* 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;
+ }
}
- }
#if 0
/* I have problems with skipping over __main() that I need to address
}
#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. */
GDB process that keeps track of these dummy frames! -- gnu@cygnus.com Aug92
*/
+static void
pop_dummy_frame ()
{
CORE_ADDR sp, pc;
®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 ii;
+ int len = 0;
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 = 0;
+ struct type *type;
- CORE_ADDR saved_sp, pc;
+ CORE_ADDR saved_sp;
if ( dummy_frame_count <= 0)
printf_unfiltered ("FATAL ERROR -push_arguments()! frame not found!!\n");
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;
if (TYPE_CODE (valtype) == TYPE_CODE_FLT) {
memcpy (valbuf, &ff, sizeof(float));
}
}
- else
+ else {
/* return value is copied starting from r3. */
- memcpy (valbuf, ®buf[REGISTER_BYTE (3)], TYPE_LENGTH (valtype));
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN
+ && TYPE_LENGTH (valtype) < REGISTER_RAW_SIZE (3))
+ offset = REGISTER_RAW_SIZE (3) - TYPE_LENGTH (valtype);
+
+ memcpy (valbuf, regbuf + REGISTER_BYTE (3) + offset,
+ TYPE_LENGTH (valtype));
+ }
}
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;
{
CORE_ADDR func_start;
struct rs6000_framedata fdata;
- int frameless;
+
+ if (fi->signal_handler_caller)
+ return read_memory_integer (fi->frame + SIG_FRAME_PC_OFFSET, 4);
func_start = get_pc_function_start (fi->pc) + FUNCTION_START_OFFSET;
return 0;
(void) skip_prologue (func_start, &fdata);
+
+ if (fdata.lr_offset == 0 && fi->next != NULL)
+ return read_memory_integer (rs6000_frame_chain (fi) + DEFAULT_LR_SAVE, 4);
+
if (fdata.lr_offset == 0)
return read_register (LR_REGNUM);
- if (fi->signal_handler_caller)
- return read_memory_integer (fi->frame + SIG_FRAME_PC_OFFSET, 4);
-
return read_memory_integer (rs6000_frame_chain (fi) + fdata.lr_offset, 4);
}
frame_addr = read_memory_integer (fi->frame, 4);
/* if != -1, fdatap->saved_fpr is the smallest number of saved_fpr.
- All fpr's from saved_fpr to fp31 are saved right underneath caller
- stack pointer, starting from fp31 first. */
+ All fpr's from saved_fpr to fp31 are saved. */
if (fdatap->saved_fpr >= 0) {
- for (ii=31; ii >= fdatap->saved_fpr; --ii)
- fi->cache_fsr->regs [FP0_REGNUM + ii] = frame_addr - ((32 - ii) * 8);
- frame_addr -= (32 - fdatap->saved_fpr) * 8;
+ int fpr_offset = frame_addr + fdatap->fpr_offset;
+ for (ii = fdatap->saved_fpr; ii < 32; ii++) {
+ fi->cache_fsr->regs [FP0_REGNUM + ii] = fpr_offset;
+ fpr_offset += 8;
+ }
}
/* if != -1, fdatap->saved_gpr is the smallest number of saved_gpr.
- All gpr's from saved_gpr to gpr31 are saved right under saved fprs,
- starting from r31 first. */
+ All gpr's from saved_gpr to gpr31 are saved. */
- if (fdatap->saved_gpr >= 0)
- for (ii=31; ii >= fdatap->saved_gpr; --ii)
- fi->cache_fsr->regs [ii] = frame_addr - ((32 - ii) * 4);
+ if (fdatap->saved_gpr >= 0) {
+ int gpr_offset = frame_addr + fdatap->gpr_offset;
+ for (ii = fdatap->saved_gpr; ii < 32; ii++) {
+ fi->cache_fsr->regs [ii] = gpr_offset;
+ gpr_offset += 4;
+ }
+ }
+
+ /* If != 0, fdatap->cr_offset is the offset from the frame that holds
+ the CR. */
+ if (fdatap->cr_offset != 0)
+ fi->cache_fsr->regs [CR_REGNUM] = frame_addr + fdatap->cr_offset;
+
+ /* If != 0, fdatap->lr_offset is the offset from the frame that holds
+ the LR. */
+ if (fdatap->lr_offset != 0)
+ fi->cache_fsr->regs [LR_REGNUM] = frame_addr + fdatap->lr_offset;
}
/* Return the address of a frame. This is the inital %sp value when the frame
/* FIXME -- this is never called! */
+#if 0
void
free_loadinfo ()
{
loadinfotocindex = 0;
loadinfotextindex = 0;
}
+#endif
/* this is called from xcoffread.c */
}
-/* 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