/* Target-dependent code for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995
+ 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 "inferior.h"
#include "symtab.h"
#include "target.h"
-
-#include <sys/param.h>
-#include <sys/dir.h>
-#include <sys/user.h>
-#include <signal.h>
-#include <sys/ioctl.h>
-#include <fcntl.h>
-
-#include <sys/ptrace.h>
-#include <sys/reg.h>
-
-#include <a.out.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-#include <sys/core.h>
-#include <sys/ldr.h>
-
+#include "gdbcore.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "xcoffsolib.h"
extern struct obstack frame_cache_obstack;
/* Breakpoint shadows for the single step instructions will be kept here. */
static struct sstep_breaks {
- int address;
- int data;
+ /* Address, or 0 if this is not in use. */
+ CORE_ADDR address;
+ /* Shadow contents. */
+ char data[4];
} stepBreaks[2];
/* Static function prototypes */
-static void
-add_text_to_loadinfo PARAMS ((CORE_ADDR textaddr, CORE_ADDR dataaddr));
+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 aix_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;
switch (opcode) {
case 18 :
immediate = ((instr & ~3) << 6) >> 6; /* br unconditional */
+ if (absolute)
+ dest = immediate;
+ else
+ dest = pc + immediate;
+ break;
case 16 :
- if (opcode != 18) /* br conditional */
- immediate = ((instr & ~3) << 16) >> 16;
+ immediate = ((instr & ~3) << 16) >> 16; /* br conditional */
if (absolute)
dest = immediate;
else
dest = read_register (LR_REGNUM) & ~3;
else if (ext_op == 528) /* br cond to count reg */
- dest = read_register (CTR_REGNUM) & ~3;
-
+ {
+ dest = read_register (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 < TEXT_SEGMENT_BASE)
+ dest = read_register (LR_REGNUM) & ~3;
+ }
else return -1;
break;
{
#define INSNLEN(OPCODE) 4
- static char breakp[] = BREAKPOINT;
- int ii, insn, ret, loc;
- int breaks[2], opcode;
+ static char le_breakp[] = LITTLE_BREAKPOINT;
+ static char be_breakp[] = BIG_BREAKPOINT;
+ char *breakp = TARGET_BYTE_ORDER == BIG_ENDIAN ? be_breakp : le_breakp;
+ int ii, insn;
+ CORE_ADDR loc;
+ CORE_ADDR breaks[2];
+ int opcode;
if (!one_stepped) {
loc = read_pc ();
- ret = read_memory (loc, &insn, sizeof (int));
- if (ret)
- printf ("Error in single_step()!!\n");
+ insn = read_memory_integer (loc, 4);
breaks[0] = loc + INSNLEN(insn);
opcode = insn >> 26;
if (breaks[1] == breaks[0])
breaks[1] = -1;
- stepBreaks[1].address = -1;
+ stepBreaks[1].address = 0;
for (ii=0; ii < 2; ++ii) {
if ( breaks[ii] == -1)
continue;
- read_memory (breaks[ii], &(stepBreaks[ii].data), sizeof(int));
+ read_memory (breaks[ii], stepBreaks[ii].data, 4);
- ret = write_memory (breaks[ii], breakp, sizeof(int));
+ write_memory (breaks[ii], breakp, 4);
stepBreaks[ii].address = breaks[ii];
}
/* remove step breakpoints. */
for (ii=0; ii < 2; ++ii)
- if (stepBreaks[ii].address != -1)
+ if (stepBreaks[ii].address != 0)
write_memory
- (stepBreaks[ii].address, &(stepBreaks[ii].data), sizeof(int));
+ (stepBreaks[ii].address, stepBreaks[ii].data, 4);
one_stepped = 0;
}
errno = 0; /* FIXME, don't ignore errors! */
+ /* What errors? {read,write}_memory call error(). */
}
-/* return pc value after skipping a function prologue. */
-
-skip_prologue (pc)
-CORE_ADDR pc;
-{
- unsigned int tmp;
- unsigned int op; /* FIXME, assumes instruction size matches host int!!! */
-
- if (target_read_memory (pc, (char *)&op, sizeof (op)))
- return pc; /* Can't access it -- assume no prologue. */
- SWAP_TARGET_AND_HOST (&op, sizeof (op));
-
- /* Assume that subsequent fetches can fail with low probability. */
-
- if (op == 0x7c0802a6) { /* mflr r0 */
- pc += 4;
- op = read_memory_integer (pc, 4);
- }
+/* return pc value after skipping a function prologue and also return
+ information about a function frame.
- if ((op & 0xfc00003e) == 0x7c000026) { /* mfcr Rx */
- pc += 4;
- op = read_memory_integer (pc, 4);
- }
-
- if ((op & 0xfc000000) == 0x48000000) { /* bl foo, to save fprs??? */
- pc += 4;
- op = read_memory_integer (pc, 4);
-
- /* At this point, make sure this is not a trampoline function
- (a function that simply calls another functions, and nothing else).
- If the next is not a nop, this branch was part of the function
- prologue. */
-
- if (op == 0x4def7b82 || /* crorc 15, 15, 15 */
- op == 0x0)
- return pc - 4; /* don't skip over this branch */
- }
+ in struct rs6000_frameinfo fdata:
+ - frameless is TRUE, if function does not have a frame.
+ - nosavedpc is TRUE, if function does not save %pc value in its frame.
+ - offset is the number of bytes used in the frame to save registers.
+ - saved_gpr is the number of the first saved gpr.
+ - saved_fpr is the number of the first saved fpr.
+ - alloca_reg is the number of the register used for alloca() handling.
+ Otherwise -1.
+ - gpr_offset is the offset of the saved gprs
+ - fpr_offset is the offset of the saved fprs
+ - lr_offset is the offset of the saved lr
+ - cr_offset is the offset of the saved cr
+ */
- if ((op & 0xfc1f0000) == 0xbc010000) { /* stm Rx, NUM(r1) */
- pc += 4;
- op = read_memory_integer (pc, 4);
- }
+#define SIGNED_SHORT(x) \
+ ((sizeof (short) == 2) \
+ ? ((int)(short)(x)) \
+ : ((int)((((x) & 0xffff) ^ 0x8000) - 0x8000)))
- while (((tmp = op >> 16) == 0x9001) || /* st r0, NUM(r1) */
- (tmp == 0x9421) || /* stu r1, NUM(r1) */
- (op == 0x93e1fffc)) /* st r31,-4(r1) */
- {
- pc += 4;
- op = read_memory_integer (pc, 4);
- }
+#define GET_SRC_REG(x) (((x) >> 21) & 0x1f)
- while ((tmp = (op >> 22)) == 0x20f) { /* l r31, ... or */
- pc += 4; /* l r30, ... */
- op = read_memory_integer (pc, 4);
- }
+CORE_ADDR
+skip_prologue (pc, fdata)
+ CORE_ADDR pc;
+ struct rs6000_framedata *fdata;
+{
+ 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;
+ fdata->saved_gpr = -1;
+ fdata->saved_fpr = -1;
+ fdata->alloca_reg = -1;
+ fdata->frameless = 1;
+ fdata->nosavedpc = 1;
+
+ if (target_read_memory (pc, buf, 4))
+ return pc; /* Can't access it -- assume no prologue. */
- /* store parameters into stack */
- while(
- (op & 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
- (op & 0xfc1f0000) == 0x90010000 || /* st r?, NUM(r1) */
- (op & 0xfc000000) == 0xfc000000 || /* frsp, fp?, .. */
- (op & 0xd0000000) == 0xd0000000) /* stfs, fp?, .. */
+ /* Assume that subsequent fetches can fail with low probability. */
+ pc -= 4;
+ for (;;)
{
- pc += 4; /* store fpr double */
+ pc += 4;
op = read_memory_integer (pc, 4);
- }
- if (op == 0x603f0000) { /* oril r31, r1, 0x0 */
- pc += 4; /* this happens if r31 is used as */
- op = read_memory_integer (pc, 4); /* frame ptr. (gcc does that) */
+ if ((op & 0xfc1fffff) == 0x7c0802a6) { /* mflr Rx */
+ lr_reg = (op & 0x03e00000) | 0x90010000;
+ continue;
+
+ } else if ((op & 0xfc1fffff) == 0x7c000026) { /* mfcr Rx */
+ cr_reg = (op & 0x03e00000) | 0x90010000;
+ continue;
+
+ } else if ((op & 0xfc1f0000) == 0xd8010000) { /* stfd Rx,NUM(r1) */
+ reg = GET_SRC_REG (op);
+ if (fdata->saved_fpr == -1 || fdata->saved_fpr > reg) {
+ fdata->saved_fpr = reg;
+ fdata->fpr_offset = SIGNED_SHORT (op) + offset;
+ }
+ continue;
+
+ } else if (((op & 0xfc1f0000) == 0xbc010000) || /* stm Rx, NUM(r1) */
+ ((op & 0xfc1f0000) == 0x90010000 && /* st rx,NUM(r1), rx >= r13 */
+ (op & 0x03e00000) >= 0x01a00000)) {
+
+ reg = GET_SRC_REG (op);
+ if (fdata->saved_gpr == -1 || fdata->saved_gpr > reg) {
+ fdata->saved_gpr = reg;
+ 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) + 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) + offset;
+ cr_reg = 0;
+ continue;
+
+ } else if (op == 0x48000005) { /* bl .+4 used in -mrelocatable */
+ continue;
+
+ } else if (op == 0x48000004) { /* b .+4 (xlc) */
+ break;
- tmp = 0;
- while ((op >> 16) == (0x907f + tmp)) { /* st r3, NUM(r31) */
- pc += 4; /* st r4, NUM(r31), ... */
- op = read_memory_integer (pc, 4);
- tmp += 0x20;
+ } 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
+ (a function that simply calls another functions, and nothing else).
+ If the next is not a nop, this branch was part of the function
+ prologue. */
+
+ if (op == 0x4def7b82 || op == 0) /* crorc 15, 15, 15 */
+ break; /* don't skip over this branch */
+
+ continue;
+
+ /* 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
+ && ! minimal_toc_loaded) { /* l r31,... or l r30,... */
+ minimal_toc_loaded = 1;
+ continue;
+
+ /* 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;
+
+ /* 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;
+
+ /* 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;
+ }
}
- }
+
#if 0
/* I have problems with skipping over __main() that I need to address
* sometime. Previously, I used to use misc_function_vector which
function as well. */
tmp = find_pc_misc_function (pc);
- if (tmp >= 0 && !strcmp (misc_function_vector [tmp].name, "main"))
+ if (tmp >= 0 && STREQ (misc_function_vector [tmp].name, "main"))
return pc + 8;
}
}
#endif /* 0 */
+ fdata->offset = - fdata->offset;
return pc;
}
void
push_dummy_frame ()
{
- int sp, pc; /* stack pointer and link register */
+ /* stack pointer. */
+ CORE_ADDR sp;
+ /* Same thing, target byte order. */
+ char sp_targ[4];
+
+ /* link register. */
+ CORE_ADDR 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;
- fetch_inferior_registers (-1);
+ target_fetch_registers (-1);
if (dummy_frame_count >= dummy_frame_size) {
dummy_frame_size += DUMMY_FRAME_ADDR_SIZE;
}
sp = read_register(SP_REGNUM);
- pc = read_register(PC_REGNUM);
+ 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;
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,
otherwise things like do_registers_info() wouldn't work properly! */
flush_cached_frames ();
- set_current_frame (create_new_frame (sp-DUMMY_FRAME_SIZE, pc));
/* save program counter in link register's space. */
- write_memory (sp+8, &pc, 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. */
}
/* Save sp or so called back chain right here. */
- write_memory (sp-DUMMY_FRAME_SIZE, &sp, 4);
+ store_address (sp_targ, 4, sp);
+ write_memory (sp-DUMMY_FRAME_SIZE, sp_targ, 4);
sp -= DUMMY_FRAME_SIZE;
/* And finally, this is the back chain. */
- write_memory (sp+8, &pc, 4);
+ write_memory (sp+8, pc_targ, 4);
}
®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
/* Now we can restore all registers. */
- store_inferior_registers (-1);
+ target_store_registers (-1);
pc = read_pc ();
flush_cached_frames ();
- set_current_frame (create_new_frame (sp, pc));
}
void
pop_frame ()
{
- int pc, lr, sp, prev_sp; /* %pc, %lr, %sp */
- struct aix_framedata fdata;
- FRAME fr = get_current_frame ();
+ CORE_ADDR pc, lr, sp, prev_sp; /* %pc, %lr, %sp */
+ struct rs6000_framedata fdata;
+ struct frame_info *frame = get_current_frame ();
int addr, ii;
pc = read_pc ();
- sp = FRAME_FP (fr);
+ sp = FRAME_FP (frame);
if (stop_stack_dummy && dummy_frame_count) {
pop_dummy_frame ();
return;
}
+ /* Make sure that all registers are valid. */
+ read_register_bytes (0, NULL, REGISTER_BYTES);
+
/* figure out previous %pc value. If the function is frameless, it is
still in the link register, otherwise walk the frames and retrieve the
saved %pc value in the previous frame. */
- addr = get_pc_function_start (fr->pc) + FUNCTION_START_OFFSET;
- function_frame_info (addr, &fdata);
+ addr = get_pc_function_start (frame->pc) + FUNCTION_START_OFFSET;
+ (void) skip_prologue (addr, &fdata);
- read_memory (sp, &prev_sp, 4);
if (fdata.frameless)
+ prev_sp = sp;
+ else
+ prev_sp = read_memory_integer (sp, 4);
+ if (fdata.lr_offset == 0)
lr = read_register (LR_REGNUM);
else
- read_memory (prev_sp+8, &lr, 4);
+ lr = read_memory_integer (prev_sp + fdata.lr_offset, 4);
/* reset %pc value. */
write_register (PC_REGNUM, lr);
addr = prev_sp - fdata.offset;
if (fdata.saved_gpr != -1)
- for (ii=fdata.saved_gpr; ii <= 31; ++ii) {
+ for (ii = fdata.saved_gpr; ii <= 31; ++ii) {
read_memory (addr, ®isters [REGISTER_BYTE (ii)], 4);
- addr += sizeof (int);
+ addr += 4;
}
if (fdata.saved_fpr != -1)
- for (ii=fdata.saved_fpr; ii <= 31; ++ii) {
+ for (ii = fdata.saved_fpr; ii <= 31; ++ii) {
read_memory (addr, ®isters [REGISTER_BYTE (ii+FP0_REGNUM)], 8);
addr += 8;
}
write_register (SP_REGNUM, prev_sp);
- store_inferior_registers (-1);
+ target_store_registers (-1);
flush_cached_frames ();
- set_current_frame (create_new_frame (prev_sp, lr));
}
-
/* fixup the call sequence of a dummy function, with the real function address.
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;
}
-
-/* return information about a function frame.
- in struct aix_frameinfo fdata:
- - frameless is TRUE, if function does not save %pc value in its frame.
- - offset is the number of bytes used in the frame to save registers.
- - saved_gpr is the number of the first saved gpr.
- - saved_fpr is the number of the first saved fpr.
- - alloca_reg is the number of the register used for alloca() handling.
- Otherwise -1.
- */
-void
-function_frame_info (pc, fdata)
- CORE_ADDR pc;
- struct aix_framedata *fdata;
-{
- unsigned int tmp;
- register unsigned int op;
-
- fdata->offset = 0;
- fdata->saved_gpr = fdata->saved_fpr = fdata->alloca_reg = -1;
-
- op = read_memory_integer (pc, 4);
- if (op == 0x7c0802a6) { /* mflr r0 */
- pc += 4;
- op = read_memory_integer (pc, 4);
- fdata->frameless = 0;
- }
- else /* else, this is a frameless invocation */
- fdata->frameless = 1;
-
-
- if ((op & 0xfc00003e) == 0x7c000026) { /* mfcr Rx */
- pc += 4;
- op = read_memory_integer (pc, 4);
- }
-
- if ((op & 0xfc000000) == 0x48000000) { /* bl foo, to save fprs??? */
- pc += 4;
- op = read_memory_integer (pc, 4);
- /* At this point, make sure this is not a trampoline function
- (a function that simply calls another functions, and nothing else).
- If the next is not a nop, this branch was part of the function
- prologue. */
-
- if (op == 0x4def7b82 || /* crorc 15, 15, 15 */
- op == 0x0)
- return; /* prologue is over */
- }
-
- if ((op & 0xfc1f0000) == 0xd8010000) { /* stfd Rx,NUM(r1) */
- pc += 4; /* store floating register double */
- op = read_memory_integer (pc, 4);
- }
-
- if ((op & 0xfc1f0000) == 0xbc010000) { /* stm Rx, NUM(r1) */
- int tmp2;
- fdata->saved_gpr = (op >> 21) & 0x1f;
- tmp2 = op & 0xffff;
- if (tmp2 > 0x7fff)
- tmp2 = 0xffff0000 | tmp2;
-
- if (tmp2 < 0) {
- tmp2 = tmp2 * -1;
- fdata->saved_fpr = (tmp2 - ((32 - fdata->saved_gpr) * 4)) / 8;
- if ( fdata->saved_fpr > 0)
- fdata->saved_fpr = 32 - fdata->saved_fpr;
- else
- fdata->saved_fpr = -1;
- }
- fdata->offset = tmp2;
- pc += 4;
- op = read_memory_integer (pc, 4);
- }
-
- while (((tmp = op >> 16) == 0x9001) || /* st r0, NUM(r1) */
- (tmp == 0x9421) || /* stu r1, NUM(r1) */
- (op == 0x93e1fffc)) /* st r31,-4(r1) */
- {
- /* gcc takes a short cut and uses this instruction to save r31 only. */
-
- if (op == 0x93e1fffc) {
- if (fdata->offset)
-/* fatal ("Unrecognized prolog."); */
- printf ("Unrecognized prolog!\n");
-
- fdata->saved_gpr = 31;
- fdata->offset = 4;
- }
- pc += 4;
- op = read_memory_integer (pc, 4);
- }
-
- while ((tmp = (op >> 22)) == 0x20f) { /* l r31, ... or */
- pc += 4; /* l r30, ... */
- op = read_memory_integer (pc, 4);
- }
-
- /* store parameters into stack */
- while(
- (op & 0xfc1f0000) == 0xd8010000 || /* stfd Rx,NUM(r1) */
- (op & 0xfc1f0000) == 0x90010000 || /* st r?, NUM(r1) */
- (op & 0xfc000000) == 0xfc000000 || /* frsp, fp?, .. */
- (op & 0xd0000000) == 0xd0000000) /* stfs, fp?, .. */
- {
- pc += 4; /* store fpr double */
- op = read_memory_integer (pc, 4);
- }
-
- if (op == 0x603f0000) /* oril r31, r1, 0x0 */
- fdata->alloca_reg = 31;
-}
-
-
-/* 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 *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 arg;
int f_argno = 0; /* current floating point argno */
+ value_ptr arg;
+ struct type *type;
CORE_ADDR saved_sp, pc;
if ( dummy_frame_count <= 0)
- printf ("FATAL ERROR -push_arguments()! frame not found!!\n");
+ printf_unfiltered ("FATAL ERROR -push_arguments()! frame not found!!\n");
/* The first eight words of ther arguments are passed in registers. Copy
them appropriately.
for (argno=0, argbytes=0; argno < nargs && ii<8; ++ii) {
- arg = value_arg_coerce (args[argno]);
- len = TYPE_LENGTH (VALUE_TYPE (arg));
+ arg = args[argno];
+ 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
there is no way we would run out of them. */
if (len > 8)
- printf (
+ printf_unfiltered (
"Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno);
- bcopy (VALUE_CONTENTS (arg),
- ®isters[REGISTER_BYTE(FP0_REGNUM + 1 + f_argno)], len);
+ memcpy (®isters[REGISTER_BYTE(FP0_REGNUM + 1 + f_argno)], VALUE_CONTENTS (arg),
+ len);
++f_argno;
}
while (argbytes < len) {
*(int*)®isters[REGISTER_BYTE(ii+3)] = 0;
- bcopy ( ((char*)VALUE_CONTENTS (arg))+argbytes,
- ®isters[REGISTER_BYTE(ii+3)],
+ memcpy (®isters[REGISTER_BYTE(ii+3)],
+ ((char*)VALUE_CONTENTS (arg))+argbytes,
(len - argbytes) > 4 ? 4 : len - argbytes);
++ii, argbytes += 4;
}
else { /* Argument can fit in one register. No problem. */
*(int*)®isters[REGISTER_BYTE(ii+3)] = 0;
- bcopy (VALUE_CONTENTS (arg), ®isters[REGISTER_BYTE(ii+3)], len);
+ memcpy (®isters[REGISTER_BYTE(ii+3)], VALUE_CONTENTS (arg), len);
}
++argno;
}
if ((argno < nargs) || argbytes) {
int space = 0, jj;
- value val;
if (argbytes) {
space += ((len - argbytes + 3) & -4);
jj = argno;
for (; jj < nargs; ++jj) {
- val = value_arg_coerce (args[jj]);
+ value_ptr val = args[jj];
space += ((TYPE_LENGTH (VALUE_TYPE (val))) + 3) & -4;
}
/* push the rest of the arguments into stack. */
for (; argno < nargs; ++argno) {
- arg = value_arg_coerce (args[argno]);
- len = TYPE_LENGTH (VALUE_TYPE (arg));
+ arg = args[argno];
+ 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 (
+ printf_unfiltered (
"Fatal Error: a floating point parameter #%d with a size > 8 is found!\n", argno);
- bcopy (VALUE_CONTENTS (arg),
- ®isters[REGISTER_BYTE(FP0_REGNUM + 1 + f_argno)], len);
+ memcpy (®isters[REGISTER_BYTE(FP0_REGNUM + 1 + f_argno)], VALUE_CONTENTS (arg),
+ len);
++f_argno;
}
- write_memory (sp+24+(ii*4), VALUE_CONTENTS (arg), len);
+ write_memory (sp+24+(ii*4), (char *) VALUE_CONTENTS (arg), len);
ii += ((len + 3) & -4) / 4;
}
}
read_memory (saved_sp, tmp_buffer, 24);
write_memory (sp, tmp_buffer, 24);
- write_memory (sp, &saved_sp, 4); /* set back chain properly */
+ /* set back chain properly */
+ store_address (tmp_buffer, 4, saved_sp);
+ write_memory (sp, tmp_buffer, 4);
- store_inferior_registers (-1);
+ target_store_registers (-1);
return sp;
}
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) {
necessary. */
if (TYPE_LENGTH (valtype) > 4) /* this is a double */
- bcopy (®buf[REGISTER_BYTE (FP0_REGNUM + 1)], valbuf,
+ memcpy (valbuf, ®buf[REGISTER_BYTE (FP0_REGNUM + 1)],
TYPE_LENGTH (valtype));
else { /* float */
- bcopy (®buf[REGISTER_BYTE (FP0_REGNUM + 1)], &dd, 8);
+ memcpy (&dd, ®buf[REGISTER_BYTE (FP0_REGNUM + 1)], 8);
ff = (float)dd;
- bcopy (&ff, valbuf, sizeof(float));
+ memcpy (valbuf, &ff, sizeof(float));
}
}
- else
+ else {
/* return value is copied starting from r3. */
- bcopy (®buf[REGISTER_BYTE (3)], valbuf, 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 rs6000_struct_return_address;
-/* Throw away this debugging code. FIXMEmgo. */
-void
-print_frame(fram)
-int fram;
-{
- int ii, val;
- for (ii=0; ii<40; ++ii) {
- if ((ii % 4) == 0)
- printf ("\n");
- val = read_memory_integer (fram + ii * 4, 4);
- printf ("0x%08x\t", val);
- }
- printf ("\n");
-}
-
-
-
/* Indirect function calls use a piece of trampoline code to do context
switching, i.e. to set the new TOC table. Skip such code if we are on
its first instruction (as when we have single-stepped to here).
+ Also skip shared library trampoline code (which is different from
+ indirect function call trampolines).
Result is desired PC to step until, or NULL if we are not in
trampoline code. */
CORE_ADDR
skip_trampoline_code (pc)
-CORE_ADDR pc;
+ CORE_ADDR pc;
{
register unsigned int ii, op;
+ CORE_ADDR solib_target_pc;
static unsigned trampoline_code[] = {
0x800b0000, /* l r0,0x0(r11) */
0
};
+ /* If pc is in a shared library trampoline, return its target. */
+ solib_target_pc = find_solib_trampoline_target (pc);
+ if (solib_target_pc)
+ return solib_target_pc;
+
for (ii=0; trampoline_code[ii]; ++ii) {
op = read_memory_integer (pc + (ii*4), 4);
if (op != trampoline_code [ii])
- return NULL;
+ return 0;
}
ii = read_register (11); /* r11 holds destination addr */
pc = read_memory_integer (ii, 4); /* (r11) value */
return pc;
}
-
-/* Determines whether the function FI has a frame on the stack or not.
- Called from the FRAMELESS_FUNCTION_INVOCATION macro in tm.h. */
+/* Determines whether the function FI has a frame on the stack or not. */
int
frameless_function_invocation (fi)
-struct frame_info *fi;
+ struct frame_info *fi;
{
CORE_ADDR func_start;
- struct aix_framedata fdata;
+ struct rs6000_framedata fdata;
+ if (fi->next != NULL)
+ /* Don't even think about framelessness except on the innermost frame. */
+ /* FIXME: Can also be frameless if fi->next->signal_handler_caller (if
+ a signal happens while executing in a frameless function). */
+ return 0;
+
func_start = get_pc_function_start (fi->pc) + FUNCTION_START_OFFSET;
/* If we failed to find the start of the function, it is a mistake
if (!func_start)
return 0;
- function_frame_info (func_start, &fdata);
+ (void) skip_prologue (func_start, &fdata);
return fdata.frameless;
}
+/* 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;
+
+ /* If we failed to find the start of the function, it is a mistake
+ to inspect the instructions. */
+ if (!func_start)
+ 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);
+
+ return read_memory_integer (rs6000_frame_chain (fi) + fdata.lr_offset, 4);
+}
/* If saved registers of frame FI are not known yet, read and cache them.
- &FDATAP contains aix_framedata; TDATAP can be NULL,
+ &FDATAP contains rs6000_framedata; TDATAP can be NULL,
in which case the framedata are read. */
static void
frame_get_cache_fsr (fi, fdatap)
struct frame_info *fi;
- struct aix_framedata *fdatap;
+ struct rs6000_framedata *fdatap;
{
int ii;
CORE_ADDR frame_addr;
- struct aix_framedata work_fdata;
+ struct rs6000_framedata work_fdata;
if (fi->cache_fsr)
return;
if (fdatap == NULL) {
fdatap = &work_fdata;
- function_frame_info (get_pc_function_start (fi->pc), fdatap);
+ (void) skip_prologue (get_pc_function_start (fi->pc), fdatap);
}
fi->cache_fsr = (struct frame_saved_regs *)
obstack_alloc (&frame_cache_obstack, sizeof (struct frame_saved_regs));
- bzero (fi->cache_fsr, sizeof (struct frame_saved_regs));
+ memset (fi->cache_fsr, '\0', sizeof (struct frame_saved_regs));
if (fi->prev && fi->prev->frame)
frame_addr = fi->prev->frame;
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
struct frame_info *fi;
{
CORE_ADDR tmpaddr;
- struct aix_framedata fdata;
+ struct rs6000_framedata fdata;
struct frame_info *callee_fi;
/* if the initial stack pointer (frame address) of this frame is known,
/* find out if this function is using an alloca register.. */
- function_frame_info (get_pc_function_start (fi->pc), &fdata);
+ (void) skip_prologue (get_pc_function_start (fi->pc), &fdata);
/* if saved registers of this frame are not known yet, read and cache them. */
for (callee_fi = fi->next; callee_fi; callee_fi = callee_fi->next) {
if (!callee_fi->cache_fsr)
- frame_get_cache_fsr (fi, NULL);
+ frame_get_cache_fsr (callee_fi, NULL);
/* this is the address in which alloca register is saved. */
return fi->initial_sp = read_register (fdata.alloca_reg);
}
-/* xcoff_relocate_symtab - hook for symbol table relocation.
- also reads shared libraries.. */
-
-xcoff_relocate_symtab (pid)
-unsigned int pid;
+CORE_ADDR
+rs6000_frame_chain (thisframe)
+ struct frame_info *thisframe;
{
-#define MAX_LOAD_SEGS 64 /* maximum number of load segments */
-
- struct ld_info *ldi;
- int temp;
-
- ldi = (void *) alloca(MAX_LOAD_SEGS * sizeof (*ldi));
-
- /* According to my humble theory, AIX has some timing problems and
- when the user stack grows, kernel doesn't update stack info in time
- and ptrace calls step on user stack. That is why we sleep here a little,
- and give kernel to update its internals. */
-
- usleep (36000);
-
- errno = 0;
- ptrace(PT_LDINFO, pid, (PTRACE_ARG3_TYPE) ldi,
- MAX_LOAD_SEGS * sizeof(*ldi), ldi);
- if (errno) {
- perror_with_name ("ptrace ldinfo");
- return 0;
- }
-
- vmap_ldinfo(ldi);
-
- do {
- add_text_to_loadinfo (ldi->ldinfo_textorg, ldi->ldinfo_dataorg);
- } while (ldi->ldinfo_next
- && (ldi = (void *) (ldi->ldinfo_next + (char *) ldi)));
-
-#if 0
- /* Now that we've jumbled things around, re-sort them. */
- sort_minimal_symbols ();
-#endif
+ CORE_ADDR fp;
+ if (inside_entry_file ((thisframe)->pc))
+ return 0;
+ if (thisframe->signal_handler_caller)
+ fp = read_memory_integer (thisframe->frame + SIG_FRAME_FP_OFFSET, 4);
+ else
+ fp = read_memory_integer ((thisframe)->frame, 4);
- /* relocate the exec and core sections as well. */
- vmap_exec ();
+ return fp;
}
\f
/* Keep an array of load segment information and their TOC table addresses.
#define LOADINFOLEN 10
-/* FIXME Warning -- loadinfotextindex is used for a nefarious purpose by
- tm-rs6000.h. */
-
static struct loadinfo *loadinfo = NULL;
static int loadinfolen = 0;
static int loadinfotocindex = 0;
-int loadinfotextindex = 0;
+static int loadinfotextindex = 0;
void
/* this is called from xcoffread.c */
void
-xcoff_add_toc_to_loadinfo (unsigned long tocoff)
+xcoff_add_toc_to_loadinfo (tocoff)
+ unsigned long tocoff;
{
while (loadinfotocindex >= loadinfolen) {
loadinfolen += LOADINFOLEN;
loadinfo [loadinfotocindex++].toc_offset = tocoff;
}
-
-static void
+void
add_text_to_loadinfo (textaddr, dataaddr)
CORE_ADDR textaddr;
CORE_ADDR dataaddr;
}
-/* FIXME: 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. But they are sequentially assigned in wildly
- different places, and probably there is no correlation. FIXME! */
+/* 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)
+ bfd_vma memaddr;
+ disassemble_info *info;
+{
+ if (TARGET_BYTE_ORDER == BIG_ENDIAN)
+ return print_insn_big_powerpc (memaddr, info);
+ else
+ return print_insn_little_powerpc (memaddr, info);
+}
+#endif
+
+void
+_initialize_rs6000_tdep ()
+{
+ /* FIXME, this should not be decided via ifdef. */
+#ifdef GDB_TARGET_POWERPC
+ tm_print_insn = gdb_print_insn_powerpc;
+#else
+ tm_print_insn = print_insn_rs6000;
+#endif
+}
projects / deliverable / binutils-gdb.git / blobdiff