* arc-tdep.c: #include "gdbcmd.h".
(codestream_seek): Pass CORE_ADDR. (arc_cpu_type, tmp_arc_cpu_type, arc_cpu_type_table): New globals. (debug_pipeline_p): Likewise. (X_...): Instruction field access macros. (BUILD_INSN): Define. (codestream_tell): Allow for stream elements > 1 byte. (codestream_fill): Likewise. (setup_prologue_scan): New function. (arc_get_frame_setup): Call it. Update to current spec regarding prologues. Use BUILD_INSN. (skip_prologue): New argument `frameless_p'. Use BUILD_INSN. (arc_frame_saved_pc): New function. (frame_find_saved_regs): Use BUILD_INSN. (get_insn_type, single_step): New functions. (one_stepped): New global. (arc_set_cpu_type_command, arc_show_cpu_type_command): New functions. (arc_set_cpu_type): New function. (_initialize_arc_tdep): Define new `set' commands `cpu', `displaypipeline', and `debugpipeline'. * remote-arc.c (break_insn): Add bi-endian support. (arc_insert_breakpoint): Likewise. (arc_remove_breakpoint): Likewise. (switch_command): Delete. * arc/tm-arc.h (TARGET_BYTE_ORDER): Delete. (TARGET_BYTE_ORDER_SELECTABLE): Define. (DEFAULT_ARC_CPU_TYPE): Define. (SKIP_PROLOGUE_FRAMELESS_P): Define. (BREAKPOINT): Delete. (BIG_BREAKPOINT, LITTLE_BREAKPOINT): Define. (DECR_PC_AFTER_BREAK): Change to 8. (NO_SINGLE_STEP): Define. (ARC_PC_TO_REAL_ADDRESS): Define. (SAVED_PC_AFTER_CALL): Use it. (NUM_REGS, REGISTER_BYTES): Fix. (FRAME_SAVED_PC): Call arc_frame_saved_pc. (FRAME_LOCALS_ADDRESS): Fix.
This commit is contained in:
David Edelsohn
parent
32513ed10d
commit
f0d795faf6
621
gdb/arc-tdep.c
621
gdb/arc-tdep.c
@ -24,9 +24,62 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||||
#include "target.h"
|
||||
#include "floatformat.h"
|
||||
#include "symtab.h"
|
||||
#include "gdbcmd.h"
|
||||
|
||||
/* Current CPU, set with the "set cpu" command. */
|
||||
char *arc_cpu_type;
|
||||
char *tmp_arc_cpu_type;
|
||||
|
||||
/* Table of cpu names. */
|
||||
struct {
|
||||
char *name;
|
||||
int value;
|
||||
} arc_cpu_type_table[] = {
|
||||
{ "base", bfd_mach_arc_base },
|
||||
{ "host", bfd_mach_arc_host },
|
||||
{ "graphics", bfd_mach_arc_graphics },
|
||||
{ "audio", bfd_mach_arc_audio },
|
||||
{ NULL, 0 }
|
||||
};
|
||||
|
||||
/* Used by simulator. */
|
||||
int display_pipeline_p;
|
||||
int cpu_timer;
|
||||
/* This one must have the same type as used in the emulator.
|
||||
It's currently an enum so this should be ok for now. */
|
||||
int debug_pipeline_p;
|
||||
|
||||
#define ARC_CALL_SAVED_REG(r) ((r) >= 16 && (r) < 24)
|
||||
|
||||
#define OPMASK 0xf8000000
|
||||
|
||||
/* Instruction field accessor macros. */
|
||||
#define X_OP(i) (((i) >> 27) & 0x1f)
|
||||
#define X_A(i) (((i) >> 21) & 0x3f)
|
||||
#define X_B(i) (((i) >> 15) & 0x3f)
|
||||
#define X_C(i) (((i) >> 9) & 0x3f)
|
||||
#define X_D(i) ((((i) & 0x1ff) ^ 0x100) - 0x100)
|
||||
#define X_L(i) (((((i) >> 5) & 0x3ffffc) ^ 0x200000) - 0x200000)
|
||||
#define X_N(i) (((i) >> 5) & 3)
|
||||
#define X_Q(i) ((i) & 0x1f)
|
||||
|
||||
/* Return non-zero if X is a short immediate data indicator. */
|
||||
#define SHIMM_P(x) ((x) == 61 || (x) == 63)
|
||||
|
||||
/* Return non-zero if X is a "long" (32 bit) immediate data indicator. */
|
||||
#define LIMM_P(x) ((x) == 62)
|
||||
|
||||
/* Build a simple instruction. */
|
||||
#define BUILD_INSN(op, a, b, c, d) \
|
||||
((((op) & 31) << 27) \
|
||||
| (((a) & 63) << 21) \
|
||||
| (((b) & 63) << 15) \
|
||||
| (((c) & 63) << 9) \
|
||||
| ((d) & 511))
|
||||
|
||||
/* Codestream stuff. */
|
||||
static void codestream_read PARAMS ((unsigned int *, int));
|
||||
static void codestream_seek PARAMS ((int));
|
||||
static void codestream_seek PARAMS ((CORE_ADDR));
|
||||
static unsigned int codestream_fill PARAMS ((int));
|
||||
|
||||
#define CODESTREAM_BUFSIZ 16
|
||||
@ -36,22 +89,28 @@ static unsigned int codestream_buf[CODESTREAM_BUFSIZ];
|
||||
static int codestream_off;
|
||||
static int codestream_cnt;
|
||||
|
||||
#define codestream_tell() (codestream_addr + codestream_off)
|
||||
#define codestream_peek() (codestream_cnt == 0 ? \
|
||||
codestream_fill(1): codestream_buf[codestream_off])
|
||||
#define codestream_get() (codestream_cnt-- == 0 ? \
|
||||
codestream_fill(0) : codestream_buf[codestream_off++])
|
||||
#define OPMASK 0xf8000000
|
||||
#define codestream_tell() \
|
||||
(codestream_addr + codestream_off * sizeof (codestream_buf[0]))
|
||||
#define codestream_peek() \
|
||||
(codestream_cnt == 0 \
|
||||
? codestream_fill (1) \
|
||||
: codestream_buf[codestream_off])
|
||||
#define codestream_get() \
|
||||
(codestream_cnt-- == 0 \
|
||||
? codestream_fill (0) \
|
||||
: codestream_buf[codestream_off++])
|
||||
|
||||
static unsigned int
|
||||
codestream_fill (peek_flag)
|
||||
int peek_flag;
|
||||
{
|
||||
codestream_addr = codestream_next_addr;
|
||||
codestream_next_addr += CODESTREAM_BUFSIZ;
|
||||
codestream_next_addr += CODESTREAM_BUFSIZ * sizeof (codestream_buf[0]);
|
||||
codestream_off = 0;
|
||||
codestream_cnt = CODESTREAM_BUFSIZ;
|
||||
read_memory (codestream_addr, (char *) codestream_buf, CODESTREAM_BUFSIZ);
|
||||
/* FIXME: need to handle byte order differences. */
|
||||
read_memory (codestream_addr, (char *) codestream_buf,
|
||||
CODESTREAM_BUFSIZ * sizeof (codestream_buf[0]));
|
||||
|
||||
if (peek_flag)
|
||||
return (codestream_peek());
|
||||
@ -61,7 +120,7 @@ codestream_fill (peek_flag)
|
||||
|
||||
static void
|
||||
codestream_seek (place)
|
||||
int place;
|
||||
CORE_ADDR place;
|
||||
{
|
||||
codestream_next_addr = place / CODESTREAM_BUFSIZ;
|
||||
codestream_next_addr *= CODESTREAM_BUFSIZ;
|
||||
@ -82,145 +141,171 @@ codestream_read (buf, count)
|
||||
for (i = 0; i < count; i++)
|
||||
*p++ = codestream_get ();
|
||||
}
|
||||
|
||||
/* Set up prologue scanning and return the first insn,
|
||||
not including the "sub sp,sp,32" of a stdarg function. */
|
||||
|
||||
/*
|
||||
* find & return amound a local space allocated, and advance codestream to
|
||||
* first register push (if any)
|
||||
* if entry sequence doesn't make sense, return -1, and leave
|
||||
* codestream pointer random
|
||||
*/
|
||||
|
||||
static long
|
||||
arc_get_frame_setup (pc)
|
||||
int pc;
|
||||
static unsigned int
|
||||
setup_prologue_scan (pc)
|
||||
CORE_ADDR pc;
|
||||
{
|
||||
unsigned int insn, n;
|
||||
unsigned int insn;
|
||||
|
||||
codestream_seek (pc);
|
||||
insn = codestream_get ();
|
||||
|
||||
if (insn & OPMASK == 0x10000000) /* st fp,[sp] */
|
||||
{
|
||||
insn = codestream_get ();
|
||||
if (insn & OPMASK != 0x10000000) /* st blink,[sp,4] */
|
||||
{
|
||||
if (insn & OPMASK != 0x60000000) /* for leaf, no st blink */
|
||||
return -1;
|
||||
}
|
||||
else if (codestream_get () & OPMASK != 0x60000000) /* mov fp,sp */
|
||||
return (-1);
|
||||
/* The authority for what appears here is the home-grown ABI. */
|
||||
|
||||
/* check for stack adjustment sub sp,nnn,sp */
|
||||
insn = codestream_peek ();
|
||||
if (insn & OPMASK == 0x50000000)
|
||||
{
|
||||
n = (insn & 0x000001ff );
|
||||
codestream_get ();
|
||||
/* First insn may be "sub sp,sp,32" if stdarg fn. */
|
||||
if (insn == BUILD_INSN (10, SP_REGNUM, SP_REGNUM, SHIMM_REGNUM, 32))
|
||||
insn = codestream_get ();
|
||||
|
||||
/* this sequence is used to get the address of the return
|
||||
* buffer for a function that returns a structure
|
||||
*/
|
||||
insn = codestream_peek ();
|
||||
if (insn & OPMASK == 0x60000000)
|
||||
codestream_get ();
|
||||
|
||||
return n;
|
||||
}
|
||||
else
|
||||
{
|
||||
return (0);
|
||||
}
|
||||
}
|
||||
return (-1);
|
||||
}
|
||||
|
||||
/* return pc of first real instruction */
|
||||
CORE_ADDR
|
||||
skip_prologue (pc)
|
||||
int pc;
|
||||
{
|
||||
unsigned int insn;
|
||||
int i;
|
||||
CORE_ADDR pos;
|
||||
|
||||
if (arc_get_frame_setup (pc) < 0)
|
||||
return (pc);
|
||||
|
||||
/* skip over register saves */
|
||||
for (i = 0; i < 10; i++)
|
||||
{
|
||||
insn = codestream_peek ();
|
||||
if (insn & OPMASK != 0x10000000) /* break if not st inst */
|
||||
break;
|
||||
codestream_get ();
|
||||
}
|
||||
|
||||
codestream_seek (pos);
|
||||
return (codestream_tell ());
|
||||
}
|
||||
|
||||
/* Return number of args passed to a frame.
|
||||
Can return -1, meaning no way to tell. */
|
||||
int
|
||||
frame_num_args (fi)
|
||||
struct frame_info *fi;
|
||||
{
|
||||
#if 1
|
||||
return -1;
|
||||
#else
|
||||
/* This loses because not only might the compiler not be popping the
|
||||
args right after the function call, it might be popping args from both
|
||||
this call and a previous one, and we would say there are more args
|
||||
than there really are. Is it true for ARC */
|
||||
|
||||
int retpc;
|
||||
unsigned char op;
|
||||
struct frame_info *pfi;
|
||||
|
||||
int frameless;
|
||||
|
||||
FRAMELESS_FUNCTION_INVOCATION (fi, frameless);
|
||||
if (frameless)
|
||||
/* In the absence of a frame pointer, GDB doesn't get correct values
|
||||
for nameless arguments. Return -1, so it doesn't print any
|
||||
nameless arguments. */
|
||||
return -1;
|
||||
|
||||
pfi = get_prev_frame_info (fi);
|
||||
if (pfi == 0)
|
||||
{
|
||||
/* Note: this can happen if we are looking at the frame for
|
||||
main, because FRAME_CHAIN_VALID won't let us go into
|
||||
start. If we have debugging symbols, that's not really
|
||||
a big deal; it just means it will only show as many arguments
|
||||
to main as are declared. */
|
||||
return -1;
|
||||
}
|
||||
else
|
||||
{
|
||||
retpc = pfi->pc;
|
||||
op = read_memory_integer (retpc, 1);
|
||||
if (op == 0x59)
|
||||
/* pop %ecx */
|
||||
return 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
return insn;
|
||||
}
|
||||
|
||||
/*
|
||||
* parse the first few instructions of the function to see
|
||||
* Find & return amount a local space allocated, and advance codestream to
|
||||
* first register push (if any).
|
||||
* If entry sequence doesn't make sense, return -1, and leave
|
||||
* codestream pointer random.
|
||||
*/
|
||||
|
||||
static long
|
||||
arc_get_frame_setup (pc)
|
||||
CORE_ADDR pc;
|
||||
{
|
||||
unsigned int insn;
|
||||
/* Size of frame or -1 if unrecognizable prologue. */
|
||||
int n = -1;
|
||||
|
||||
insn = setup_prologue_scan (pc);
|
||||
|
||||
if ((insn & BUILD_INSN (-1, 0, -1, -1, -1)) /* st blink,[sp,4] */
|
||||
== BUILD_INSN (2, 0, SP_REGNUM, BLINK_REGNUM, 4))
|
||||
{
|
||||
insn = codestream_get ();
|
||||
/* Frame may not be necessary, even though blink is saved.
|
||||
At least this is something we recognize. */
|
||||
n = 0;
|
||||
}
|
||||
|
||||
if ((insn & BUILD_INSN (-1, 0, -1, -1, -1)) /* st fp,[sp] */
|
||||
== BUILD_INSN (2, 0, SP_REGNUM, FP_REGNUM, 0))
|
||||
{
|
||||
insn = codestream_get ();
|
||||
if ((insn & BUILD_INSN (-1, -1, -1, -1, 0))
|
||||
!= BUILD_INSN (12, FP_REGNUM, SP_REGNUM, SP_REGNUM, 0))
|
||||
return -1;
|
||||
|
||||
/* Check for stack adjustment sub sp,sp,nnn. */
|
||||
insn = codestream_peek ();
|
||||
if ((insn & BUILD_INSN (-1, -1, -1, 0, 0))
|
||||
== BUILD_INSN (10, SP_REGNUM, SP_REGNUM, 0, 0))
|
||||
{
|
||||
if (LIMM_P (X_C (insn)))
|
||||
n = codestream_get ();
|
||||
else if (SHIMM_P (X_C (insn)))
|
||||
n = X_D (insn);
|
||||
else
|
||||
return -1;
|
||||
if (n < 0)
|
||||
return -1;
|
||||
|
||||
codestream_get ();
|
||||
|
||||
/* This sequence is used to get the address of the return
|
||||
buffer for a function that returns a structure. */
|
||||
insn = codestream_peek ();
|
||||
if (insn & OPMASK == 0x60000000)
|
||||
codestream_get ();
|
||||
}
|
||||
/* Frameless fn. */
|
||||
else
|
||||
{
|
||||
n = 0;
|
||||
}
|
||||
}
|
||||
|
||||
return n;
|
||||
}
|
||||
|
||||
/* Given a pc value, skip it forward past the function prologue by
|
||||
disassembling instructions that appear to be a prologue.
|
||||
|
||||
If FRAMELESS_P is set, we are only testing to see if the function
|
||||
is frameless. If it is a frameless function, return PC unchanged.
|
||||
This allows a quicker answer. */
|
||||
|
||||
CORE_ADDR
|
||||
skip_prologue (pc, frameless_p)
|
||||
CORE_ADDR pc;
|
||||
int frameless_p;
|
||||
{
|
||||
unsigned int insn;
|
||||
int i, frame_size;
|
||||
|
||||
if ((frame_size = arc_get_frame_setup (pc)) < 0)
|
||||
return (pc);
|
||||
|
||||
if (frameless_p)
|
||||
return frame_size == 0 ? pc : codestream_tell ();
|
||||
|
||||
/* Skip over register saves. */
|
||||
for (i = 0; i < 8; i++)
|
||||
{
|
||||
insn = codestream_peek ();
|
||||
if ((insn & BUILD_INSN (-1, 0, -1, 0, 0))
|
||||
!= BUILD_INSN (2, 0, SP_REGNUM, 0, 0))
|
||||
break; /* not st insn */
|
||||
if (! ARC_CALL_SAVED_REG (X_C (insn)))
|
||||
break;
|
||||
codestream_get ();
|
||||
}
|
||||
|
||||
return codestream_tell ();
|
||||
}
|
||||
|
||||
/* Return the return address for a frame.
|
||||
This is used to implement FRAME_SAVED_PC.
|
||||
This is taken from frameless_look_for_prologue. */
|
||||
|
||||
CORE_ADDR
|
||||
arc_frame_saved_pc (frame)
|
||||
struct frame_info *frame;
|
||||
{
|
||||
CORE_ADDR func_start;
|
||||
unsigned int insn;
|
||||
|
||||
func_start = get_pc_function_start (frame->pc) + FUNCTION_START_OFFSET;
|
||||
if (func_start == 0)
|
||||
{
|
||||
/* Best guess. */
|
||||
return ARC_PC_TO_REAL_ADDRESS (read_memory_integer (FRAME_FP (frame) + 4, 4));
|
||||
}
|
||||
|
||||
/* If the first insn is "st blink,[sp,4]" we can get blink from there.
|
||||
Otherwise this is a leaf function and we can use blink. Note that
|
||||
this still allows for the case where a leaf function saves/clobbers/
|
||||
restores blink. */
|
||||
|
||||
insn = setup_prologue_scan (func_start);
|
||||
|
||||
if ((insn & BUILD_INSN (-1, 0, -1, -1, -1)) /* st blink,[sp,4] */
|
||||
!= BUILD_INSN (2, 0, SP_REGNUM, BLINK_REGNUM, 4))
|
||||
return ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM));
|
||||
else
|
||||
return ARC_PC_TO_REAL_ADDRESS (read_memory_integer (FRAME_FP (frame) + 4, 4));
|
||||
}
|
||||
|
||||
/*
|
||||
* Parse the first few instructions of the function to see
|
||||
* what registers were stored.
|
||||
*
|
||||
* The startup sequence can be at the start of the function.
|
||||
* 'st fp,[sp], st blink,[sp+4], mov fp,sp'
|
||||
* 'st blink,[sp+4], st fp,[sp], mov fp,sp'
|
||||
*
|
||||
* Local space is allocated just below by sub sp,nnn,sp
|
||||
* Next, the registers used by this function are stored.
|
||||
* Local space is allocated just below by sub sp,sp,nnn.
|
||||
* Next, the registers used by this function are stored (as offsets from sp).
|
||||
*/
|
||||
|
||||
void
|
||||
@ -233,15 +318,13 @@ frame_find_saved_regs (fip, fsrp)
|
||||
CORE_ADDR dummy_bottom;
|
||||
CORE_ADDR adr;
|
||||
int i, regnum, offset;
|
||||
|
||||
|
||||
memset (fsrp, 0, sizeof *fsrp);
|
||||
|
||||
/* if frame is the end of a dummy, compute where the
|
||||
* beginning would be
|
||||
*/
|
||||
|
||||
/* If frame is the end of a dummy, compute where the beginning would be. */
|
||||
dummy_bottom = fip->frame - 4 - REGISTER_BYTES - CALL_DUMMY_LENGTH;
|
||||
|
||||
/* check if the PC is in the stack, in a dummy frame */
|
||||
|
||||
/* Check if the PC is in the stack, in a dummy frame. */
|
||||
if (dummy_bottom <= fip->pc && fip->pc <= fip->frame)
|
||||
{
|
||||
/* all regs were saved by push_call_dummy () */
|
||||
@ -253,23 +336,25 @@ frame_find_saved_regs (fip, fsrp)
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
locals = arc_get_frame_setup (get_pc_function_start (fip->pc));
|
||||
|
||||
|
||||
if (locals >= 0)
|
||||
{
|
||||
/* Set `adr' to the value of `sp'. */
|
||||
adr = fip->frame - locals;
|
||||
for (i = 0; i < 10; i++)
|
||||
for (i = 0; i < 8; i++)
|
||||
{
|
||||
insn = codestream_get ();
|
||||
if (insn & 0xffff8000 != 0x100d8000)
|
||||
if ((insn & BUILD_INSN (-1, 0, -1, 0, 0))
|
||||
!= BUILD_INSN (2, 0, SP_REGNUM, 0, 0))
|
||||
break;
|
||||
regnum = (insn & 0x00007c00) >> 9;
|
||||
offset = (insn << 23) >> 23;
|
||||
regnum = X_C (insn);
|
||||
offset = X_D (insn);
|
||||
fsrp->regs[regnum] = adr + offset;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
fsrp->regs[PC_REGNUM] = fip->frame + 4;
|
||||
fsrp->regs[FP_REGNUM] = fip->frame;
|
||||
}
|
||||
@ -322,7 +407,141 @@ pop_frame ()
|
||||
write_register (SP_REGNUM, fp + 8);
|
||||
flush_cached_frames ();
|
||||
}
|
||||
|
||||
/* Simulate single-step. */
|
||||
|
||||
typedef enum
|
||||
{
|
||||
NORMAL4, /* a normal 4 byte insn */
|
||||
NORMAL8, /* a normal 8 byte insn */
|
||||
BRANCH4, /* a 4 byte branch insn, including ones without delay slots */
|
||||
BRANCH8, /* an 8 byte branch insn, including ones with delay slots */
|
||||
} insn_type;
|
||||
|
||||
/* Return the type of INSN and store in TARGET the destination address of a
|
||||
branch if this is one. */
|
||||
/* ??? Need to verify all cases are properly handled. */
|
||||
|
||||
static insn_type
|
||||
get_insn_type (insn, pc, target)
|
||||
unsigned long insn;
|
||||
CORE_ADDR pc, *target;
|
||||
{
|
||||
unsigned long limm;
|
||||
|
||||
switch (insn >> 27)
|
||||
{
|
||||
case 0 : case 1 : case 2 : /* load/store insns */
|
||||
if (LIMM_P (X_A (insn))
|
||||
|| LIMM_P (X_B (insn))
|
||||
|| LIMM_P (X_C (insn)))
|
||||
return NORMAL8;
|
||||
return NORMAL4;
|
||||
case 4 : case 5 : case 6 : /* branch insns */
|
||||
*target = pc + 4 + X_L (insn);
|
||||
/* ??? It isn't clear that this is always the right answer.
|
||||
The problem occurs when the next insn is an 8 byte insn. If the
|
||||
branch is conditional there's no worry as there shouldn't be an 8
|
||||
byte insn following. The programmer may be cheating if s/he knows
|
||||
the branch will never be taken, but we don't deal with that.
|
||||
Note that the programmer is also allowed to play games by putting
|
||||
an insn with long immediate data in the delay slot and then duplicate
|
||||
the long immediate data at the branch target. Ugh! */
|
||||
if (X_N (insn) == 0)
|
||||
return BRANCH4;
|
||||
return BRANCH8;
|
||||
case 7 : /* jump insns */
|
||||
if (LIMM_P (X_B (insn)))
|
||||
{
|
||||
limm = read_memory_integer (pc + 4, 4);
|
||||
*target = ARC_PC_TO_REAL_ADDRESS (limm);
|
||||
return BRANCH8;
|
||||
}
|
||||
if (SHIMM_P (X_B (insn)))
|
||||
*target = ARC_PC_TO_REAL_ADDRESS (X_D (insn));
|
||||
else
|
||||
*target = ARC_PC_TO_REAL_ADDRESS (read_register (X_B (insn)));
|
||||
if (X_Q (insn) == 0 && X_N (insn) == 0)
|
||||
return BRANCH4;
|
||||
return BRANCH8;
|
||||
default : /* arithmetic insns, etc. */
|
||||
if (LIMM_P (X_A (insn))
|
||||
|| LIMM_P (X_B (insn))
|
||||
|| LIMM_P (X_C (insn)))
|
||||
return NORMAL8;
|
||||
return NORMAL4;
|
||||
}
|
||||
}
|
||||
|
||||
/* Non-zero if we just simulated a single-step. This is needed because we
|
||||
cannot remove the breakpoints in the inferior process until after the
|
||||
`wait' in `wait_for_inferior'. */
|
||||
|
||||
int one_stepped;
|
||||
|
||||
/* single_step() is called just before we want to resume the inferior, if we
|
||||
want to single-step it but there is no hardware or kernel single-step
|
||||
support. We find all the possible targets of the coming instruction and
|
||||
breakpoint them.
|
||||
|
||||
single_step is also called just after the inferior stops. If we had
|
||||
set up a simulated single-step, we undo our damage. */
|
||||
|
||||
void
|
||||
single_step (ignore)
|
||||
int ignore; /* sig, but we don't need it */
|
||||
{
|
||||
static CORE_ADDR next_pc, target;
|
||||
static int brktrg_p;
|
||||
typedef char binsn_quantum[BREAKPOINT_MAX];
|
||||
static binsn_quantum break_mem[2];
|
||||
|
||||
if (!one_stepped)
|
||||
{
|
||||
insn_type type;
|
||||
CORE_ADDR pc;
|
||||
unsigned long insn;
|
||||
|
||||
pc = read_register (PC_REGNUM);
|
||||
insn = read_memory_integer (pc, 4);
|
||||
type = get_insn_type (insn, pc, &target);
|
||||
|
||||
/* Always set a breakpoint for the insn after the branch. */
|
||||
next_pc = pc + ((type == NORMAL8 || type == BRANCH8) ? 8 : 4);
|
||||
target_insert_breakpoint (next_pc, break_mem[0]);
|
||||
|
||||
brktrg_p = 0;
|
||||
|
||||
if ((type == BRANCH4 || type == BRANCH8)
|
||||
/* Watch out for branches to the following location.
|
||||
We just stored a breakpoint there and another call to
|
||||
target_insert_breakpoint will think the real insn is the
|
||||
breakpoint we just stored there. */
|
||||
&& target != next_pc)
|
||||
{
|
||||
brktrg_p = 1;
|
||||
target_insert_breakpoint (target, break_mem[1]);
|
||||
}
|
||||
|
||||
/* We are ready to let it go. */
|
||||
one_stepped = 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Remove breakpoints. */
|
||||
target_remove_breakpoint (next_pc, break_mem[0]);
|
||||
|
||||
if (brktrg_p)
|
||||
target_remove_breakpoint (target, break_mem[1]);
|
||||
|
||||
/* Fix the pc. */
|
||||
stop_pc -= DECR_PC_AFTER_BREAK;
|
||||
write_pc (stop_pc);
|
||||
|
||||
one_stepped = 0;
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef GET_LONGJMP_TARGET
|
||||
/* Figure out where the longjmp will land. Slurp the args out of the stack.
|
||||
We expect the first arg to be a pointer to the jmp_buf structure from which
|
||||
@ -354,9 +573,113 @@ get_longjmp_target(pc)
|
||||
return 1;
|
||||
}
|
||||
#endif /* GET_LONGJMP_TARGET */
|
||||
|
||||
/* Command to set cpu type. */
|
||||
|
||||
void
|
||||
arc_set_cpu_type_command (args, from_tty)
|
||||
char *args;
|
||||
int from_tty;
|
||||
{
|
||||
int i;
|
||||
|
||||
if (tmp_arc_cpu_type == NULL || *tmp_arc_cpu_type == '\0')
|
||||
{
|
||||
printf_unfiltered ("The known ARC cpu types are as follows:\n");
|
||||
for (i = 0; arc_cpu_type_table[i].name != NULL; ++i)
|
||||
printf_unfiltered ("%s\n", arc_cpu_type_table[i].name);
|
||||
|
||||
/* Restore the value. */
|
||||
tmp_arc_cpu_type = strsave (arc_cpu_type);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
if (!arc_set_cpu_type (tmp_arc_cpu_type))
|
||||
{
|
||||
error ("Unknown cpu type `%s'.", tmp_arc_cpu_type);
|
||||
/* Restore its value. */
|
||||
tmp_arc_cpu_type = strsave (arc_cpu_type);
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
arc_show_cpu_type_command (args, from_tty)
|
||||
char *args;
|
||||
int from_tty;
|
||||
{
|
||||
}
|
||||
|
||||
/* Modify the actual cpu type.
|
||||
Result is a boolean indicating success. */
|
||||
|
||||
int
|
||||
arc_set_cpu_type (str)
|
||||
char *str;
|
||||
{
|
||||
int i, j;
|
||||
|
||||
if (str == NULL)
|
||||
return 0;
|
||||
|
||||
for (i = 0; arc_cpu_type_table[i].name != NULL; ++i)
|
||||
{
|
||||
if (strcasecmp (str, arc_cpu_type_table[i].name) == 0)
|
||||
{
|
||||
arc_cpu_type = str;
|
||||
tm_print_insn = arc_get_disassembler (arc_cpu_type_table[i].value,
|
||||
TARGET_BYTE_ORDER == BIG_ENDIAN);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
_initialize_arc_tdep ()
|
||||
{
|
||||
tm_print_insn = arc_get_disassembler (bfd_mach_arc_host);
|
||||
struct cmd_list_element *c;
|
||||
|
||||
c = add_set_cmd ("cpu", class_support, var_string_noescape,
|
||||
(char *) &tmp_arc_cpu_type,
|
||||
"Set the type of ARC cpu in use.\n\
|
||||
This command has two purposes. In a multi-cpu system it lets one\n\
|
||||
change the cpu being debugged. It also gives one access to\n\
|
||||
cpu-type-specific registers and recognize cpu-type-specific instructions.\
|
||||
",
|
||||
&setlist);
|
||||
c->function.cfunc = arc_set_cpu_type_command;
|
||||
c = add_show_from_set (c, &showlist);
|
||||
c->function.cfunc = arc_show_cpu_type_command;
|
||||
|
||||
/* We have to use strsave here because the `set' command frees it before
|
||||
setting a new value. */
|
||||
tmp_arc_cpu_type = strsave (DEFAULT_ARC_CPU_TYPE);
|
||||
arc_set_cpu_type (tmp_arc_cpu_type);
|
||||
|
||||
c = add_set_cmd ("displaypipeline", class_support, var_zinteger,
|
||||
(char *) &display_pipeline_p,
|
||||
"Set pipeline display (simulator only).\n\
|
||||
When enabled, the state of the pipeline after each cycle is displayed.",
|
||||
&setlist);
|
||||
c = add_show_from_set (c, &showlist);
|
||||
|
||||
c = add_set_cmd ("debugpipeline", class_support, var_zinteger,
|
||||
(char *) &debug_pipeline_p,
|
||||
"Set pipeline debug display (simulator only).\n\
|
||||
When enabled, debugging information about the pipeline is displayed.",
|
||||
&setlist);
|
||||
c = add_show_from_set (c, &showlist);
|
||||
|
||||
c = add_set_cmd ("cputimer", class_support, var_zinteger,
|
||||
(char *) &cpu_timer,
|
||||
"Set maximum cycle count (simulator only).\n\
|
||||
Control will return to gdb if the timer expires.\n\
|
||||
A negative value disables the timer.",
|
||||
&setlist);
|
||||
c = add_show_from_set (c, &showlist);
|
||||
|
||||
/* FIXME: must be done after for now. */
|
||||
tm_print_insn = arc_get_disassembler (bfd_mach_arc_base, 1 /*FIXME*/);
|
||||
}
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
/* Parameters for target machine ARC, for GDB, the GNU debugger.
|
||||
Copyright (C) 1995 Free Software Foundation, Inc.
|
||||
Contributed by Cygnus Support Corporation.
|
||||
Contributed by Cygnus Support.
|
||||
|
||||
This file is part of GDB.
|
||||
|
||||
@ -18,8 +18,11 @@ 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. */
|
||||
|
||||
/* Byte order is configurable, but this machine runs little-endian. */
|
||||
#define TARGET_BYTE_ORDER LITTLE_ENDIAN
|
||||
/* Used by arc-tdep.c to set the default cpu type. */
|
||||
#define DEFAULT_ARC_CPU_TYPE "base"
|
||||
|
||||
/* Byte order is selectable. */
|
||||
#define TARGET_BYTE_ORDER_SELECTABLE
|
||||
|
||||
/* We have IEEE floating point, if we have any float at all. */
|
||||
#define IEEE_FLOAT
|
||||
@ -28,31 +31,61 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||||
Zero on most machines. */
|
||||
#define FUNCTION_START_OFFSET 0
|
||||
|
||||
/* Advance pc across any function entry prologue instructions
|
||||
to reach some "real" code. */
|
||||
/* Advance PC across any function entry prologue instructions
|
||||
to reach some "real" code. SKIP_PROLOGUE_FRAMELESS_P advances
|
||||
the PC past some of the prologue, but stops as soon as it
|
||||
knows that the function has a frame. Its result is equal
|
||||
to its input PC if the function is frameless, unequal otherwise. */
|
||||
|
||||
#define SKIP_PROLOGUE(pc) { pc = skip_prologue (pc); }
|
||||
extern CORE_ADDR skip_prologue ();
|
||||
#define SKIP_PROLOGUE(pc) \
|
||||
{ pc = skip_prologue (pc, 0); }
|
||||
#define SKIP_PROLOGUE_FRAMELESS_P(pc) \
|
||||
{ pc = skip_prologue (pc, 1); }
|
||||
extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR, int));
|
||||
|
||||
/* Sequence of bytes for breakpoint instruction. */
|
||||
#define BREAKPOINT {0x01, 0x80, 0xbe, 0x1f}
|
||||
/* Sequence of bytes for breakpoint instruction.
|
||||
??? The current value is "sr -1,[-1]" and is for the simulator only.
|
||||
The simulator watches for this and does the right thing.
|
||||
The hardware version will have to associate with each breakpoint
|
||||
the sequence "flag 1; nop; nop; nop". IE: The breakpoint insn will not
|
||||
be a fixed set of bits but instead will be a branch to a semi-random
|
||||
address. Presumably this will be cleaned up for "second silicon". */
|
||||
#define BIG_BREAKPOINT { 0x12, 0x1f, 0xff, 0xff }
|
||||
#define LITTLE_BREAKPOINT { 0xff, 0xff, 0x1f, 0x12 }
|
||||
|
||||
#define DECR_PC_AFTER_BREAK 4
|
||||
/* ??? This value may eventually be correct (if/when proper breakpoints
|
||||
are added). Until then no value is correct so leave as is and cope. */
|
||||
#define DECR_PC_AFTER_BREAK 8
|
||||
|
||||
/* We don't have a reliable single step facility.
|
||||
??? We do have a cycle single step facility, but that won't work. */
|
||||
#define NO_SINGLE_STEP
|
||||
extern int one_stepped;
|
||||
extern void single_step PARAMS ((int));
|
||||
|
||||
/* Given a pc value as defined by the hardware, return the real address.
|
||||
Remember that on the ARC blink contains that status register which
|
||||
includes PC + flags (so we have to mask out the flags). */
|
||||
#define ARC_PC_TO_REAL_ADDRESS(pc) (((pc) & 0xffffff) << 2)
|
||||
|
||||
/* Immediately after a function call, return the saved pc.
|
||||
Can't always go through the frames for this because on some machines
|
||||
the new frame is not set up until the new function
|
||||
executes some instructions. */
|
||||
|
||||
#define SAVED_PC_AFTER_CALL(frame) (read_register (BLINK_REGNUM))
|
||||
#define SAVED_PC_AFTER_CALL(frame) \
|
||||
(ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM)))
|
||||
|
||||
/* Stack grows upward */
|
||||
|
||||
#define INNER_THAN <
|
||||
|
||||
/* Nonzero if instruction at pc is a return instruction. */
|
||||
/* Nonzero if instruction at pc is a return instruction.
|
||||
This is the "j [blink]" insn (with or without conditionals or delay
|
||||
slots). */
|
||||
|
||||
#define ABOUT_TO_RETURN(pc) (read_memory_integer(pc,4) == 0x380f8000)
|
||||
#define ABOUT_TO_RETURN(pc) \
|
||||
((read_memory_integer(pc, 4) & 0xffffff80) == 0x380f8000)
|
||||
|
||||
/* Say how long (ordinary) registers are. This is a piece of bogosity
|
||||
used in push_word and a few other places; REGISTER_RAW_SIZE is the
|
||||
@ -60,7 +93,7 @@ extern CORE_ADDR skip_prologue ();
|
||||
#define REGISTER_SIZE 4
|
||||
|
||||
/* Number of machine registers */
|
||||
#define NUM_REGS 91
|
||||
#define NUM_REGS 92
|
||||
|
||||
/* Initializer for an array of names of registers.
|
||||
There should be NUM_REGS strings in this initializer. */
|
||||
@ -97,6 +130,11 @@ extern CORE_ADDR skip_prologue ();
|
||||
#define AUX_BEG_REGNUM 61 /* aux reg begins */
|
||||
#define AUX_END_REGNUM 90 /* aux reg ends, pc not real aux reg */
|
||||
|
||||
/* Fake registers used to mark immediate data. */
|
||||
#define SHIMM_FLAG_REGNUM 61
|
||||
#define LIMM_REGNUM 62
|
||||
#define SHIMM_REGNUM 63
|
||||
|
||||
#define AUX_REG_MAP \
|
||||
{ \
|
||||
{ 0, 1, 2, 3, 4, 5, \
|
||||
@ -129,7 +167,7 @@ extern CORE_ADDR skip_prologue ();
|
||||
|
||||
/* Total amount of space needed to store our copies of the machine's
|
||||
register state, the array `registers'. */
|
||||
#define REGISTER_BYTES (91*4)
|
||||
#define REGISTER_BYTES (NUM_REGS * 4)
|
||||
|
||||
/* Index within `registers' of the first byte of the space for register N. */
|
||||
#define REGISTER_BYTE(N) (4*(N))
|
||||
@ -165,7 +203,7 @@ extern CORE_ADDR skip_prologue ();
|
||||
this is also an argument. This is used in call_function to build a
|
||||
stack, and in value_being_returned to print return values.
|
||||
|
||||
On arc, a structure is always retunred with pointer in r??. */
|
||||
On arc, a structure is always retunred with pointer in r0. */
|
||||
|
||||
#define USE_STRUCT_CONVENTION(gcc_p, type) 1
|
||||
|
||||
@ -199,11 +237,6 @@ extern CORE_ADDR skip_prologue ();
|
||||
/* Describe the pointer in each stack frame to the previous stack frame
|
||||
(its caller). */
|
||||
|
||||
/* FRAME_CHAIN takes a frame's nominal address
|
||||
and produces the frame's chain-pointer.
|
||||
However, if FRAME_CHAIN_VALID returns zero,
|
||||
it means the given frame is the outermost one and has no caller. */
|
||||
|
||||
/* We cache information about saved registers in the frame structure,
|
||||
to save us from having to re-scan function prologues every time
|
||||
a register in a non-current frame is accessed. */
|
||||
@ -221,17 +254,20 @@ extern CORE_ADDR skip_prologue ();
|
||||
#define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
|
||||
((fi)->fsr = 0, (fi)->arg_pointer = -1)
|
||||
|
||||
/* FRAME_CHAIN takes a frame's nominal address
|
||||
and produces the frame's chain-pointer.
|
||||
However, if FRAME_CHAIN_VALID returns zero,
|
||||
it means the given frame is the outermost one and has no caller. */
|
||||
/* On the arc, we get the chain pointer by reading the PFP saved
|
||||
on the stack. */
|
||||
/* the PFP and RPC is in fp and fp+4. or it is in fp+4 and fp+8 ??? */
|
||||
/* The PFP and RPC is in fp and fp+4. */
|
||||
|
||||
#define FRAME_CHAIN(thisframe) \
|
||||
(read_memory_integer (FRAME_FP(thisframe), 4))
|
||||
(read_memory_integer (FRAME_FP (thisframe), 4))
|
||||
|
||||
/* FRAME_CHAIN_VALID returns zero if the given frame is the outermost one
|
||||
and has no caller.
|
||||
#define FRAME_CHAIN_VALID(thisframe) \
|
||||
1
|
||||
and has no caller. */
|
||||
#define FRAME_CHAIN_VALID(chain, thisframe) ((chain) != 0)
|
||||
|
||||
/* A macro that tells us whether the function invocation represented
|
||||
by FI does not have a frame on the stack associated with it. If it
|
||||
@ -242,24 +278,28 @@ extern CORE_ADDR skip_prologue ();
|
||||
if ((FI)->signal_handler_caller) \
|
||||
(FRAMELESS) = 0; \
|
||||
else \
|
||||
(FRAMELESS) = frameless_look_for_prologue(FI); \
|
||||
(FRAMELESS) = frameless_look_for_prologue (FI); \
|
||||
} while (0)
|
||||
|
||||
#define FRAME_SAVED_PC(frame) \
|
||||
(read_memory_integer(FRAME_CHAIN(frame)+8,4))
|
||||
/* Where is the PC for a specific frame.
|
||||
A leaf function may never save blink, so we have to check for that here. */
|
||||
|
||||
/* On the ARC, FRAME_ARGS_ADDRESS should return the value of
|
||||
g14 as passed into the frame, if known. We need a function for this.
|
||||
#define FRAME_SAVED_PC(frame) (arc_frame_saved_pc (frame))
|
||||
struct frame_info; /* in case frame.h not included yet */
|
||||
CORE_ADDR arc_frame_saved_pc PARAMS ((struct frame_info *));
|
||||
|
||||
/* If the argument is on the stack, it will be here.
|
||||
We cache this value in the frame info if we've already looked it up. */
|
||||
/* ??? Is the arg_pointer check necessary? */
|
||||
|
||||
#define FRAME_ARGS_ADDRESS(fi) \
|
||||
(((fi)->arg_pointer != -1)? (fi)->arg_pointer: (fi)->frame + 4)
|
||||
#define FRAME_ARGS_ADDRESS(fi) \
|
||||
(((fi)->arg_pointer != -1) ? (fi)->arg_pointer : (fi)->frame)
|
||||
|
||||
/* This is the same except it should return 0 when
|
||||
it does not really know where the args are, rather than guessing.
|
||||
This value is not cached since it is only used infrequently. */
|
||||
|
||||
#define FRAME_LOCALS_ADDRESS(fi) (fi)->frame + 4
|
||||
#define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
|
||||
|
||||
/* Set NUMARGS to the number of args passed to a frame.
|
||||
Can return -1, meaning no way to tell. */
|
||||
|
||||
@ -894,20 +894,10 @@ arc_mourn ()
|
||||
}
|
||||
|
||||
|
||||
#ifdef REMOTE_BREAKPOINT
|
||||
|
||||
/* On some machines, e.g. 68k, we may use a different breakpoint instruction
|
||||
than other targets. */
|
||||
static unsigned char break_insn[] = REMOTE_BREAKPOINT;
|
||||
|
||||
/* Check that it fits in BREAKPOINT_MAX bytes. */
|
||||
static unsigned char check_break_insn_size[BREAKPOINT_MAX] = REMOTE_BREAKPOINT;
|
||||
|
||||
#else /* No REMOTE_BREAKPOINT. */
|
||||
|
||||
static unsigned char break_insn[] = BREAKPOINT;
|
||||
|
||||
#endif /* No REMOTE_BREAKPOINT. */
|
||||
static unsigned char big_break_insn[] = BIG_BREAKPOINT;
|
||||
static unsigned char little_break_insn[] = LITTLE_BREAKPOINT;
|
||||
#define BREAKPOINT_LEN (sizeof little_break_insn)
|
||||
|
||||
/* Insert a breakpoint on targets that don't have any better breakpoint
|
||||
support. We read the contents of the target location and stash it,
|
||||
@ -924,9 +914,16 @@ arc_insert_breakpoint (addr, contents_cache)
|
||||
{
|
||||
int val;
|
||||
|
||||
val = target_read_memory (addr, contents_cache, sizeof break_insn);
|
||||
val = target_read_memory (addr, contents_cache, BREAKPOINT_LEN);
|
||||
if (val == 0)
|
||||
val = target_write_memory (addr, (char *)break_insn, sizeof break_insn);
|
||||
{
|
||||
if (TARGET_BYTE_ORDER == BIG_ENDIAN)
|
||||
val = target_write_memory (addr, (char *) big_break_insn,
|
||||
BREAKPOINT_LEN);
|
||||
else
|
||||
val = target_write_memory (addr, (char *) little_break_insn,
|
||||
BREAKPOINT_LEN);
|
||||
}
|
||||
return val;
|
||||
}
|
||||
|
||||
@ -935,7 +932,7 @@ arc_remove_breakpoint (addr, contents_cache)
|
||||
CORE_ADDR addr;
|
||||
char *contents_cache;
|
||||
{
|
||||
return target_write_memory (addr, contents_cache, sizeof break_insn);
|
||||
return target_write_memory (addr, contents_cache, BREAKPOINT_LEN);
|
||||
}
|
||||
|
||||
/* switch_command
|
||||
@ -961,13 +958,16 @@ switch_command (args, fromtty)
|
||||
switch (proc)
|
||||
{
|
||||
case 0:
|
||||
tm_print_insn = arc_get_disassembler (bfd_mach_arc_audio);
|
||||
tm_print_insn = arc_get_disassembler (bfd_mach_arc_audio,
|
||||
TARGET_BYTE_ORDER == BIG_ENDIAN);
|
||||
break;
|
||||
case 1:
|
||||
tm_print_insn = arc_get_disassembler (bfd_mach_arc_graphics);
|
||||
tm_print_insn = arc_get_disassembler (bfd_mach_arc_graphics,
|
||||
TARGET_BYTE_ORDER == BIG_ENDIAN);
|
||||
break;
|
||||
case 2:
|
||||
tm_print_insn = arc_get_disassembler (bfd_mach_arc_host);
|
||||
tm_print_insn = arc_get_disassembler (bfd_mach_arc_host,
|
||||
TARGET_BYTE_ORDER == BIG_ENDIAN);
|
||||
break;
|
||||
}
|
||||
|
||||
@ -1026,7 +1026,4 @@ void
|
||||
_initialize_remote_arc ()
|
||||
{
|
||||
add_target (&arc_ops);
|
||||
add_com ("switch <processor>", class_obscure, switch_command,
|
||||
"Switch to debug a different processor, can be one of 'host', \
|
||||
'graphic' and 'audio'.");
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user