/* Target-dependent code for GDB, the GNU debugger.
- Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
This file is part of GDB.
#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>
+
+
+extern struct obstack frame_cache_obstack;
extern int errno;
-extern int attach_flag;
/* Nonzero if we just simulated a single step break. */
int one_stepped;
-
/* Breakpoint shadows for the single step instructions will be kept here. */
static struct sstep_breaks {
int data;
} 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
+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 aix_framedata *fdatap));
/*
* Calculate the destination of a branch/jump. Return -1 if not a branch.
*/
-static int
+static CORE_ADDR
branch_dest (opcode, instr, pc, safety)
- int opcode, instr, pc, safety;
+ int opcode;
+ int instr;
+ CORE_ADDR pc;
+ CORE_ADDR safety;
{
register long offset;
- unsigned dest;
+ CORE_ADDR dest;
int immediate;
int absolute;
int ext_op;
switch (opcode) {
case 18 :
- immediate = ((instr & ~3) << 6) >> 6; /* br unconditionl */
+ immediate = ((instr & ~3) << 6) >> 6; /* br unconditional */
case 16 :
if (opcode != 18) /* br conditional */
/* AIX does not support PT_STEP. Simulate it. */
-int
+void
single_step (signal)
-int signal;
+ int signal;
{
#define INSNLEN(OPCODE) 4
int breaks[2], opcode;
if (!one_stepped) {
- extern CORE_ADDR text_start;
loc = read_pc ();
ret = read_memory (loc, &insn, sizeof (int));
}
one_stepped = 1;
- ptrace (PT_CONTINUE, inferior_pid, 1, signal, 0);
- }
- else {
+ } else {
/* remove step breakpoints. */
for (ii=0; ii < 2; ++ii)
one_stepped = 0;
}
- errno = 0;
- return 1;
+ errno = 0; /* FIXME, don't ignore errors! */
}
/* return pc value after skipping a function prologue. */
skip_prologue (pc)
-int pc;
+CORE_ADDR pc;
{
unsigned int tmp;
- unsigned int op;
+ 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. */
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 */
}
if ((op & 0xfc1f0000) == 0xbc010000) { /* stm Rx, NUM(r1) */
}
-/* text start and end addresses in virtual memory. */
-
-CORE_ADDR text_start;
-CORE_ADDR text_end;
-
-
/*************************************************************************
Support for creating pushind a dummy frame into the stack, and popping
frames, etc.
/* push a dummy frame into stack, save all register. Currently we are saving
only gpr's and fpr's, which is not good enough! FIXMEmgo */
+void
push_dummy_frame ()
{
int sp, pc; /* stack pointer and link register */
int ii;
- fetch_inferior_registers (-1);
+ target_fetch_registers (-1);
if (dummy_frame_count >= dummy_frame_size) {
dummy_frame_size += DUMMY_FRAME_ADDR_SIZE;
addresses of dummy frames as such. When poping happens and when we
detect that was a dummy frame, we pop it back to its parent by using
dummy frame stack (`dummy_frame_addr' array).
+
+FIXME: This whole concept is broken. You should be able to detect
+a dummy stack frame *on the user's stack itself*. When you do,
+then you know the format of that stack frame -- including its
+saved SP register! There should *not* be a separate stack in the
+GDB process that keeps track of these dummy frames! -- gnu@cygnus.com Aug92
*/
pop_dummy_frame ()
/* 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));
/* pop the innermost frame, go back to the caller. */
+void
pop_frame ()
{
int pc, lr, sp, prev_sp; /* %pc, %lr, %sp */
}
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;
- int pc;
- int fun;
+ 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 ii;
- unsigned long target_addr;
- unsigned long tocvalue;
+ CORE_ADDR target_addr;
+ CORE_ADDR tocvalue;
target_addr = fun;
tocvalue = find_toc_address (target_addr);
}
-
/* return information about a function frame.
in struct aix_frameinfo fdata:
- frameless is TRUE, if function does not save %pc value in its frame.
- alloca_reg is the number of the register used for alloca() handling.
Otherwise -1.
*/
+void
function_frame_info (pc, fdata)
- int pc;
+ CORE_ADDR pc;
struct aix_framedata *fdata;
{
unsigned int tmp;
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) */
write_memory (sp, &saved_sp, 4); /* set back chain properly */
- store_inferior_registers (-1);
+ target_store_registers (-1);
return sp;
}
/* a given return value in `regbuf' with a type `valtype', extract and copy its
value into `valbuf' */
+void
extract_return_value (valtype, regbuf, valbuf)
struct type *valtype;
char regbuf[REGISTER_BYTES];
}
-/* keep keep structure return address in this variable. */
+/* keep structure return address in this variable.
+ FIXME: This is a horrid kludge which should not be allowed to continue
+ living. This only allows a single nested call to a structure-returning
+ function. Come on, guys! -- gnu@cygnus.com, Aug 92 */
CORE_ADDR rs6000_struct_return_address;
/* Throw away this debugging code. FIXMEmgo. */
+void
print_frame(fram)
int fram;
{
Result is desired PC to step until, or NULL if we are not in
trampoline code. */
+CORE_ADDR
skip_trampoline_code (pc)
-int pc;
+CORE_ADDR pc;
{
register unsigned int ii, op;
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. */
+
+int
+frameless_function_invocation (fi)
+struct frame_info *fi;
+{
+ CORE_ADDR func_start;
+ struct aix_framedata fdata;
+
+ 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;
+
+ function_frame_info (func_start, &fdata);
+ return fdata.frameless;
+}
+
+
+/* If saved registers of frame FI are not known yet, read and cache them.
+ &FDATAP contains aix_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;
+{
+ int ii;
+ CORE_ADDR frame_addr;
+ struct aix_framedata work_fdata;
+
+ if (fi->cache_fsr)
+ return;
+
+ if (fdatap == NULL) {
+ fdatap = &work_fdata;
+ function_frame_info (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));
+
+ if (fi->prev && fi->prev->frame)
+ frame_addr = fi->prev->frame;
+ else
+ 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. */
+
+ 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;
+ }
+
+ /* 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. */
+
+ if (fdatap->saved_gpr >= 0)
+ for (ii=31; ii >= fdatap->saved_gpr; --ii)
+ fi->cache_fsr->regs [ii] = frame_addr - ((32 - ii) * 4);
+}
+
+/* Return the address of a frame. This is the inital %sp value when the frame
+ was first allocated. For functions calling alloca(), it might be saved in
+ an alloca register. */
+
+CORE_ADDR
+frame_initial_stack_address (fi)
+ struct frame_info *fi;
+{
+ CORE_ADDR tmpaddr;
+ struct aix_framedata fdata;
+ struct frame_info *callee_fi;
+
+ /* if the initial stack pointer (frame address) of this frame is known,
+ just return it. */
+
+ if (fi->initial_sp)
+ return fi->initial_sp;
+
+ /* find out if this function is using an alloca register.. */
+
+ function_frame_info (get_pc_function_start (fi->pc), &fdata);
+
+ /* if saved registers of this frame are not known yet, read and cache them. */
+
+ if (!fi->cache_fsr)
+ frame_get_cache_fsr (fi, &fdata);
+
+ /* If no alloca register used, then fi->frame is the value of the %sp for
+ this frame, and it is good enough. */
+
+ if (fdata.alloca_reg < 0) {
+ fi->initial_sp = fi->frame;
+ return fi->initial_sp;
+ }
+
+ /* This function has an alloca register. If this is the top-most frame
+ (with the lowest address), the value in alloca register is good. */
+
+ if (!fi->next)
+ return fi->initial_sp = read_register (fdata.alloca_reg);
+
+ /* Otherwise, this is a caller frame. Callee has usually already saved
+ registers, but there are exceptions (such as when the callee
+ has no parameters). Find the address in which caller's alloca
+ register is saved. */
+
+ for (callee_fi = fi->next; callee_fi; callee_fi = callee_fi->next) {
+
+ if (!callee_fi->cache_fsr)
+ frame_get_cache_fsr (fi, NULL);
+
+ /* this is the address in which alloca register is saved. */
+
+ tmpaddr = callee_fi->cache_fsr->regs [fdata.alloca_reg];
+ if (tmpaddr) {
+ fi->initial_sp = read_memory_integer (tmpaddr, 4);
+ return fi->initial_sp;
+ }
+
+ /* Go look into deeper levels of the frame chain to see if any one of
+ the callees has saved alloca register. */
+ }
+
+ /* If alloca register was not saved, by the callee (or any of its callees)
+ then the value in the register is still good. */
+
+ 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;
+{
+#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
+
+ /* relocate the exec and core sections as well. */
+ vmap_exec ();
+}
+\f
+/* Keep an array of load segment information and their TOC table addresses.
+ This info will be useful when calling a shared library function by hand. */
+
+struct loadinfo {
+ CORE_ADDR textorg, dataorg;
+ unsigned long toc_offset;
+};
+
+#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;
+
+
+void
+xcoff_init_loadinfo ()
+{
+ loadinfotocindex = 0;
+ loadinfotextindex = 0;
+
+ if (loadinfolen == 0) {
+ loadinfo = (struct loadinfo *)
+ xmalloc (sizeof (struct loadinfo) * LOADINFOLEN);
+ loadinfolen = LOADINFOLEN;
+ }
+}
+
+
+/* FIXME -- this is never called! */
+void
+free_loadinfo ()
+{
+ if (loadinfo)
+ free (loadinfo);
+ loadinfo = NULL;
+ loadinfolen = 0;
+ loadinfotocindex = 0;
+ loadinfotextindex = 0;
+}
+
+/* this is called from xcoffread.c */
+
+void
+xcoff_add_toc_to_loadinfo (unsigned long tocoff)
+{
+ while (loadinfotocindex >= loadinfolen) {
+ loadinfolen += LOADINFOLEN;
+ loadinfo = (struct loadinfo *)
+ xrealloc (loadinfo, sizeof(struct loadinfo) * loadinfolen);
+ }
+ loadinfo [loadinfotocindex++].toc_offset = tocoff;
+}
+
+
+static void
+add_text_to_loadinfo (textaddr, dataaddr)
+ CORE_ADDR textaddr;
+ CORE_ADDR dataaddr;
+{
+ while (loadinfotextindex >= loadinfolen) {
+ loadinfolen += LOADINFOLEN;
+ loadinfo = (struct loadinfo *)
+ xrealloc (loadinfo, sizeof(struct loadinfo) * loadinfolen);
+ }
+ loadinfo [loadinfotextindex].textorg = textaddr;
+ loadinfo [loadinfotextindex].dataorg = dataaddr;
+ ++loadinfotextindex;
+}
+
+
+/* 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! */
+
+static CORE_ADDR
+find_toc_address (pc)
+ CORE_ADDR pc;
+{
+ int ii, toc_entry, tocbase = 0;
+
+ for (ii=0; ii < loadinfotextindex; ++ii)
+ if (pc > loadinfo[ii].textorg && loadinfo[ii].textorg > tocbase) {
+ toc_entry = ii;
+ tocbase = loadinfo[ii].textorg;
+ }
+
+ return loadinfo[toc_entry].dataorg + loadinfo[toc_entry].toc_offset;
+}
projects / deliverable / binutils-gdb.git / blobdiff