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m68k.c (m68k_frame): Move before protos referencing it.

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* config/m68k/m68k.c (m68k_frame): Move before protos referencing it.
	(m68k_save_reg): Add boolean parameter `interrupt_handler'.
	(m68k_interrupt_function_p): New function.
	(m68k_handle_fndecl_attribute): Ditto.
	(m68k_compute_frame_layout): Ditto.
	(m68k_attribute_table): Define back-end specific attributes.
	(m68k_output_function_epilogue): Emit RTE instruction for interrupt
	functions.

Co-Authored-By: Bernardo Innocenti <bernie@develer.com>

From-SVN: r72329
This commit is contained in:
Peter Barada 2003-10-11 04:53:13 +00:00 committed by Bernardo Innocenti
parent ba591f5a88
commit 48ed72a45c
2 changed files with 122 additions and 48 deletions
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24
gcc/ChangeLog
View File

@ -1,3 +1,15 @@
2003-10-11 Peter Barada <peter@baradas.org>
Bernardo Innocenti <bernie@develer.com>
* config/m68k/m68k.c (m68k_frame): Move before protos referencing it.
(m68k_save_reg): Add boolean parameter `interrupt_handler'.
(m68k_interrupt_function_p): New function.
(m68k_handle_fndecl_attribute): Ditto.
(m68k_compute_frame_layout): Ditto.
(m68k_attribute_table): Define back-end specific attributes.
(m68k_output_function_epilogue): Emit RTE instruction for interrupt
functions.
2003-10-11 Bernardo Innocenti <bernie@develer.com>
* config/m68k/t-uclinux: New target Makefile fragment.
@ -46,18 +58,6 @@
* gcc/config/m68k/m68k.md (call): Call m68k_output_pic_call().
(call_value): Likewise.
2003-10-11 Peter Barada <peter@baradas.org>
Bernardo Innocenti <bernie@develer.com>
* config/m68k/m68k.c (m68k_frame): Move before protos referencing it.
(m68k_save_reg): Add boolean parameter `interrupt_handler'.
(m68k_interrupt_function_p): New function.
(m68k_handle_fndecl_attribute): Ditto.
(m68k_compute_frame_layout): Ditto.
(m68k_attribute_table): Define back-end specific attributes.
(m68k_output_function_epilogue): Emit RTE instruction for interrupt
functions.
2003-10-10 Zack Weinberg <zack@codesourcery.com>
* gengenrtl.c (find_formats, genheader): Make i an unsigned

146
gcc/config/m68k/m68k.c
View File

@ -45,6 +45,23 @@ Boston, MA 02111-1307, USA. */
/* Needed for use_return_insn. */
#include "flags.h"
/* Structure describing stack frame layout. */
struct m68k_frame {
HOST_WIDE_INT offset;
HOST_WIDE_INT size;
/* data and address register */
int reg_no;
unsigned int reg_mask;
unsigned int reg_rev_mask;
/* fpu registers */
int fpu_no;
unsigned int fpu_mask;
unsigned int fpu_rev_mask;
/* offsets relative to ARG_POINTER. */
HOST_WIDE_INT frame_pointer_offset;
HOST_WIDE_INT stack_pointer_offset;
};
/* This flag is used to communicate between movhi and ASM_OUTPUT_CASE_END,
if SGS_SWITCH_TABLE. */
int switch_table_difference_label_flag;
@ -62,7 +79,12 @@ static void m68k_hp320_file_start (void);
#endif
static void m68k_output_mi_thunk (FILE *, tree, HOST_WIDE_INT,
HOST_WIDE_INT, tree);
static int m68k_save_reg (unsigned int);
static bool m68k_interrupt_function_p (tree func);
static tree m68k_handle_fndecl_attribute (tree *node, tree name,
tree args, int flags,
bool *no_add_attrs);
static void m68k_compute_frame_layout (struct m68k_frame *frame);
static bool m68k_save_reg (unsigned int regno, bool interrupt_handler);
static int const_int_cost (rtx);
static bool m68k_rtx_costs (rtx, int, int, int *);
@ -139,6 +161,16 @@ int m68k_last_compare_had_fp_operands;
#undef TARGET_RTX_COSTS
#define TARGET_RTX_COSTS m68k_rtx_costs
#undef TARGET_ATTRIBUTE_TABLE
#define TARGET_ATTRIBUTE_TABLE m68k_attribute_table
static const struct attribute_spec m68k_attribute_table[] =
{
/* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
{ "interrupt_handler", 0, 0, true, false, false, m68k_handle_fndecl_attribute },
{ NULL, 0, 0, false, false, false, NULL }
};
struct gcc_target targetm = TARGET_INITIALIZER;
/* Sometimes certain combinations of command options do not make
@ -249,36 +281,50 @@ override_options (void)
REAL_MODE_FORMAT (XFmode) = &ieee_extended_motorola_format;
}
/* Structure describing stack frame layout. */
struct m68k_frame {
HOST_WIDE_INT offset;
HOST_WIDE_INT size;
/* data and address register */
int reg_no;
unsigned int reg_mask;
unsigned int reg_rev_mask;
/* fpu registers */
int fpu_no;
unsigned int fpu_mask;
unsigned int fpu_rev_mask;
/* fpa registers */
int fpa_no;
/* offsets relative to ARG_POINTER. */
HOST_WIDE_INT frame_pointer_offset;
HOST_WIDE_INT stack_pointer_offset;
};
/* Return nonzero if FUNC is an interrupt function as specified by the
"interrupt_handler" attribute. */
static bool
m68k_interrupt_function_p(tree func)
{
tree a;
if (TREE_CODE (func) != FUNCTION_DECL)
return false;
a = lookup_attribute ("interrupt_handler", DECL_ATTRIBUTES (func));
return (a != NULL_TREE);
}
/* Handle an attribute requiring a FUNCTION_DECL; arguments as in
struct attribute_spec.handler. */
static tree
m68k_handle_fndecl_attribute (tree *node, tree name,
tree args ATTRIBUTE_UNUSED,
int flags ATTRIBUTE_UNUSED,
bool *no_add_attrs)
{
if (TREE_CODE (*node) != FUNCTION_DECL)
{
warning ("`%s' attribute only applies to functions",
IDENTIFIER_POINTER (name));
*no_add_attrs = true;
}
return NULL_TREE;
}
static void
m68k_compute_frame_layout (struct m68k_frame *frame)
{
int regno, saved;
unsigned int mask, rmask;
bool interrupt_handler = m68k_interrupt_function_p (current_function_decl);
frame->size = (get_frame_size () + 3) & -4;
mask = rmask = saved = 0;
for (regno = 0; regno < 16; regno++)
if (m68k_save_reg (regno))
if (m68k_save_reg (regno, interrupt_handler))
{
mask |= 1 << regno;
rmask |= 1 << (15 - regno);
@ -327,13 +373,13 @@ m68k_initial_elimination_offset (int from, int to)
abort();
}
/* Return 1 if we need to save REGNO. */
static int
m68k_save_reg (unsigned int regno)
/* Return true if we need to save REGNO. */
static bool
m68k_save_reg (unsigned int regno, bool interrupt_handler)
{
if (flag_pic && current_function_uses_pic_offset_table
&& regno == PIC_OFFSET_TABLE_REGNUM)
return 1;
return true;
if (current_function_calls_eh_return)
{
@ -344,14 +390,35 @@ m68k_save_reg (unsigned int regno)
if (test == INVALID_REGNUM)
break;
if (test == regno)
return 1;
return true;
}
}
return (regs_ever_live[regno]
&& !call_used_regs[regno]
&& !fixed_regs[regno]
&& !(regno == FRAME_POINTER_REGNUM && frame_pointer_needed));
/* Fixed regs we never touch. */
if (fixed_regs[regno])
return false;
/* The frame pointer (if it is such) is handled specially. */
if (regno == FRAME_POINTER_REGNUM && frame_pointer_needed)
return false;
/* Interrupt handlers must also save call_used_regs
if they are live or when calling nested functions. */
if (interrupt_handler)
{
if (regs_ever_live[regno])
return true;
if (!current_function_is_leaf && call_used_regs[regno])
return true;
}
/* Never need to save registers that aren't touched. */
if (!regs_ever_live[regno])
return false;
/* Otherwise save everthing that isn't call-clobbered. */
return !call_used_regs[regno];
}
/* This function generates the assembly code for function entry.
@ -375,6 +442,7 @@ m68k_output_function_prologue (FILE *stream, HOST_WIDE_INT size)
HOST_WIDE_INT fsize = (size + 3) & -4;
HOST_WIDE_INT fsize_with_regs;
HOST_WIDE_INT cfa_offset = INCOMING_FRAME_SP_OFFSET;
bool interrupt_handler = m68k_interrupt_function_p (current_function_decl);
/* If the stack limit is a symbol, we can check it here,
before actually allocating the space. */
@ -394,7 +462,7 @@ m68k_output_function_prologue (FILE *stream, HOST_WIDE_INT size)
{
/* on Coldfire add register save into initial stack frame setup, if possible */
for (regno = 0; regno < 16; regno++)
if (m68k_save_reg (regno))
if (m68k_save_reg (regno, interrupt_handler))
num_saved_regs++;
if (num_saved_regs <= 2)
@ -541,7 +609,7 @@ m68k_output_function_prologue (FILE *stream, HOST_WIDE_INT size)
if (TARGET_68881)
{
for (regno = 16; regno < 24; regno++)
if (m68k_save_reg (regno))
if (m68k_save_reg (regno, interrupt_handler))
{
mask |= 1 << (regno - 16);
num_saved_regs++;
@ -571,7 +639,7 @@ m68k_output_function_prologue (FILE *stream, HOST_WIDE_INT size)
num_saved_regs = 0;
}
for (regno = 0; regno < 16; regno++)
if (m68k_save_reg (regno))
if (m68k_save_reg (regno, interrupt_handler))
{
mask |= 1 << (15 - regno);
num_saved_regs++;
@ -706,12 +774,15 @@ int
use_return_insn ()
{
int regno;
bool interrupt_handler;
if (!reload_completed || frame_pointer_needed || get_frame_size () != 0)
return 0;
interrupt_handler = m68k_interrupt_function_p (current_function_decl);
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (m68k_save_reg (regno))
if (m68k_save_reg (regno, interrupt_handler))
return 0;
return 1;
@ -737,6 +808,7 @@ m68k_output_function_epilogue (FILE *stream, HOST_WIDE_INT size)
int big = 0;
rtx insn = get_last_insn ();
int restore_from_sp = 0;
bool interrupt_handler = m68k_interrupt_function_p (current_function_decl);
/* If the last insn was a BARRIER, we don't have to write any code. */
if (GET_CODE (insn) == NOTE)
@ -756,7 +828,7 @@ m68k_output_function_epilogue (FILE *stream, HOST_WIDE_INT size)
if (TARGET_68881)
{
for (regno = 16; regno < 24; regno++)
if (m68k_save_reg (regno))
if (m68k_save_reg (regno, interrupt_handler))
{
nregs++;
fmask |= 1 << (23 - regno);
@ -765,7 +837,7 @@ m68k_output_function_epilogue (FILE *stream, HOST_WIDE_INT size)
foffset = nregs * 12;
nregs = 0; mask = 0;
for (regno = 0; regno < 16; regno++)
if (m68k_save_reg (regno))
if (m68k_save_reg (regno, interrupt_handler))
{
nregs++;
mask |= 1 << regno;
@ -1053,7 +1125,9 @@ m68k_output_function_epilogue (FILE *stream, HOST_WIDE_INT size)
asm_fprintf (stream, "\taddl %Ra0,%Rsp\n");
#endif
}
if (current_function_pops_args)
if (interrupt_handler)
fprintf (stream, "\trte\n");
else if (current_function_pops_args)
asm_fprintf (stream, "\trtd %I%d\n", current_function_pops_args);
else
fprintf (stream, "\trts\n");