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* rs6000-tdep.c (store_param_on_stack_p): New function, 

an improved version of some code extracted from skip_prologue().
        (skip_prologue): Use store_param_on_stack_p() to detect
        instructions saving a parameter on the stack. Detect when r0
        is used to save a parameter.
        Do not mark "li rx, SIMM" instructions as part of the prologue,
        unless the following instruction is also part of the prologue.
This commit is contained in:
Joel Brobecker 2004-05-15 05:57:16 +00:00
parent 366ddcd57f
commit 773df3e50e
2 changed files with 95 additions and 20 deletions
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10
gdb/ChangeLog
View File

@ -1,3 +1,13 @@
2004-05-15 Joel Brobecker <brobecker@gnat.com>
* rs6000-tdep.c (store_param_on_stack_p): New function,
an improved version of some code extracted from skip_prologue().
(skip_prologue): Use store_param_on_stack_p() to detect
instructions saving a parameter on the stack. Detect when r0
is used to save a parameter.
Do not mark "li rx, SIMM" instructions as part of the prologue,
unless the following instruction is also part of the prologue.
2004-05-14 Andrew Cagney <cagney@redhat.com>
* infrun.c (handle_inferior_event): Simplify

105
gdb/rs6000-tdep.c
View File

@ -592,6 +592,76 @@ refine_prologue_limit (CORE_ADDR pc, CORE_ADDR lim_pc)
return lim_pc;
}
/* Return nonzero if the given instruction OP can be part of the prologue
of a function and saves a parameter on the stack. FRAMEP should be
set if one of the previous instructions in the function has set the
Frame Pointer. */
static int
store_param_on_stack_p (unsigned long op, int framep, int *r0_contains_arg)
{
/* Move parameters from argument registers to temporary register. */
if ((op & 0xfc0007fe) == 0x7c000378) /* mr(.) Rx,Ry */
{
/* Rx must be scratch register r0. */
const int rx_regno = (op >> 16) & 31;
/* Ry: Only r3 - r10 are used for parameter passing. */
const int ry_regno = GET_SRC_REG (op);
if (rx_regno == 0 && ry_regno >= 3 && ry_regno <= 10)
{
*r0_contains_arg = 1;
return 1;
}
else
return 0;
}
/* Save a General Purpose Register on stack. */
if ((op & 0xfc1f0003) == 0xf8010000 || /* std Rx,NUM(r1) */
(op & 0xfc1f0000) == 0xd8010000) /* stfd Rx,NUM(r1) */
{
/* Rx: Only r3 - r10 are used for parameter passing. */
const int rx_regno = GET_SRC_REG (op);
return (rx_regno >= 3 && rx_regno <= 10);
}
/* Save a General Purpose Register on stack via the Frame Pointer. */
if (framep &&
((op & 0xfc1f0000) == 0x901f0000 || /* st rx,NUM(r31) */
(op & 0xfc1f0000) == 0x981f0000 || /* stb Rx,NUM(r31) */
(op & 0xfc1f0000) == 0xd81f0000)) /* stfd Rx,NUM(r31) */
{
/* Rx: Usually, only r3 - r10 are used for parameter passing.
However, the compiler sometimes uses r0 to hold an argument. */
const int rx_regno = GET_SRC_REG (op);
return ((rx_regno >= 3 && rx_regno <= 10)
|| (rx_regno == 0 && *r0_contains_arg));
}
if ((op & 0xfc1f0000) == 0xfc010000) /* frsp, fp?,NUM(r1) */
{
/* Only f2 - f8 are used for parameter passing. */
const int src_regno = GET_SRC_REG (op);
return (src_regno >= 2 && src_regno <= 8);
}
if (framep && ((op & 0xfc1f0000) == 0xfc1f0000)) /* frsp, fp?,NUM(r31) */
{
/* Only f2 - f8 are used for parameter passing. */
const int src_regno = GET_SRC_REG (op);
return (src_regno >= 2 && src_regno <= 8);
}
/* Not an insn that saves a parameter on stack. */
return 0;
}
static CORE_ADDR
skip_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct rs6000_framedata *fdata)
@ -614,6 +684,7 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct rs6000_framedata *fdata)
int minimal_toc_loaded = 0;
int prev_insn_was_prologue_insn = 1;
int num_skip_non_prologue_insns = 0;
int r0_contains_arg = 0;
const struct bfd_arch_info *arch_info = gdbarch_bfd_arch_info (current_gdbarch);
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
@ -682,11 +753,15 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct rs6000_framedata *fdata)
ones. */
if (lr_reg < 0)
lr_reg = (op & 0x03e00000);
if (lr_reg == 0)
r0_contains_arg = 0;
continue;
}
else if ((op & 0xfc1fffff) == 0x7c000026)
{ /* mfcr Rx */
cr_reg = (op & 0x03e00000);
if (cr_reg == 0)
r0_contains_arg = 0;
continue;
}
@ -733,6 +808,7 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct rs6000_framedata *fdata)
for >= 32k frames */
fdata->offset = (op & 0x0000ffff) << 16;
fdata->frameless = 0;
r0_contains_arg = 0;
continue;
}
@ -741,6 +817,7 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct rs6000_framedata *fdata)
lf of >= 32k frames */
fdata->offset |= (op & 0x0000ffff);
fdata->frameless = 0;
r0_contains_arg = 0;
continue;
}
@ -874,26 +951,7 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct rs6000_framedata *fdata)
/* store parameters in stack */
}
/* Move parameters from argument registers to temporary register. */
else if ((op & 0xfc0007fe) == 0x7c000378 && /* mr(.) Rx,Ry */
(((op >> 21) & 31) >= 3) && /* R3 >= Ry >= R10 */
(((op >> 21) & 31) <= 10) &&
(((op >> 16) & 31) == 0)) /* Rx: scratch register r0 */
{
continue;
}
else if ((op & 0xfc1f0003) == 0xf8010000 || /* std 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(r31) */
(op & 0xfc1f0000) == 0x981f0000 || /* stb Rx,NUM(r31) */
(op & 0xfc1f0000) == 0xd81f0000 || /* stfd Rx,NUM(r31) */
(op & 0xfc1f0000) == 0xfc1f0000)) /* frsp, fp?,NUM(r31) */
else if (store_param_on_stack_p (op, framep, &r0_contains_arg))
{
continue;
@ -962,8 +1020,15 @@ skip_prologue (CORE_ADDR pc, CORE_ADDR lim_pc, struct rs6000_framedata *fdata)
else if ((op & 0xffff0000) == 0x38000000 /* li r0, SIMM */
|| (op & 0xffff0000) == 0x39c00000) /* li r14, SIMM */
{
if ((op & 0xffff0000) == 0x38000000)
r0_contains_arg = 0;
li_found_pc = pc;
vr_saved_offset = SIGNED_SHORT (op);
/* This insn by itself is not part of the prologue, unless
if part of the pair of insns mentioned above. So do not
record this insn as part of the prologue yet. */
prev_insn_was_prologue_insn = 0;
}
/* Store vector register S at (r31+r0) aligned to 16 bytes. */
/* 011111 sssss 11111 00000 00111001110 */