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Fix oinitialisation of frame pointer in interrupt functions.

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Fix compile time warnings

From-SVN: r43540
This commit is contained in:
Nick Clifton 2001-06-24 09:46:02 +00:00 committed by Nick Clifton
parent d06dd0e18f
commit 7b8b8ade89
3 changed files with 60 additions and 15 deletions
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14
gcc/ChangeLog
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@ -1,3 +1,17 @@
2001-06-24 Nick Clifton <nickc@cambridge.redhat.com>
* config/arm/arm.c (arm_compute_save_reg_mask): For FIQ interrupt
handlers examine register r0-r7, for other interrupt handlers
examine r0-r12. If the interrupt handler is not a leaf function
save all call clobbered registers.
(arm_output_epilogue): If the prologue has pushed the IP register,
restore it here.
(Arm_expand_prologue): For interrupt functions that need the frame
pointer, push the IP register before it is corrupted.
* config/arm/arm.h (ARM_SIGN_EXTEND): Fix compile time warnings
about the use of signed and unsigned quantities in a conditional.
2001-06-23 Richard Henderson <rth@redhat.com>
* config/alpha/crtfastmath.c: New file.

45
gcc/config/arm/arm.c
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@ -43,6 +43,7 @@ Boston, MA 02111-1307, USA. */
#include "ggc.h"
#include "except.h"
#include "c-pragma.h"
#include "integrate.h"
#include "tm_p.h"
/* Forward definitions of types. */
@ -6931,12 +6932,29 @@ arm_compute_save_reg_mask ()
if (IS_VOLATILE (func_type))
return save_reg_mask;
if (ARM_FUNC_TYPE (func_type) == ARM_FT_ISR)
if (IS_INTERRUPT (func_type))
{
/* FIQ handlers have registers r8 - r12 banked, so
we only need to check r0 - r7, they must save them. */
for (reg = 0; reg < 8; reg++)
if (regs_ever_live[reg])
unsigned int max_reg;
/* Interrupt functions must not corrupt any registers,
even call clobbered ones. If this is a leaf function
we can just examine the registers used by the RTL, but
otherwise we have to assume that whatever function is
called might clobber anything, and so we have to save
all the call-clobbered registers as well. */
if (ARM_FUNC_TYPE (func_type) == ARM_FT_FIQ)
/* FIQ handlers have registers r8 - r12 banked, so
we only need to check r0 - r7, Normal ISRs only
bank r14 and r15, so ew must check up to r12.
r13 is the stack pointer which is always preserved,
so we do not need to consider it here. */
max_reg = 7;
else
max_reg = 12;
for (reg = 0; reg <= max_reg; reg++)
if (regs_ever_live[reg]
|| (! current_function_is_leaf && call_used_regs [reg]))
save_reg_mask |= (1 << reg);
}
else
@ -7410,6 +7428,11 @@ arm_output_epilogue (really_return)
saved_regs_mask &= ~ (1 << PC_REGNUM);
print_multi_reg (f, "ldmea\t%r", FP_REGNUM, saved_regs_mask);
if (IS_INTERRUPT (func_type))
/* Interrupt handlers will have pushed the
IP onto the stack, so restore it now. */
print_multi_reg (f, "ldmea\t%r", SP_REGNUM, 1 << IP_REGNUM);
}
else
{
@ -7783,7 +7806,15 @@ arm_expand_prologue ()
if (frame_pointer_needed)
{
if (IS_NESTED (func_type))
if (IS_INTERRUPT (func_type))
{
/* Interrupt functions must not corrupt any registers.
Creating a frame pointer however, corrupts the IP
register, so we must push it first. */
insn = emit_multi_reg_push (1 << IP_REGNUM);
RTX_FRAME_RELATED_P (insn) = 1;
}
else if (IS_NESTED (func_type))
{
/* The Static chain register is the same as the IP register
used as a scratch register during stack frame creation.
@ -8925,7 +8956,7 @@ replace_symbols_in_block (block, orig, new)
)
continue;
DECL_RTL (sym) = new;
SET_DECL_RTL (sym, new);
}
replace_symbols_in_block (BLOCK_SUBBLOCKS (block), orig, new);

16
gcc/config/arm/arm.h
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@ -969,8 +969,8 @@ extern const char * structure_size_string;
If we have to have a frame pointer we might as well make use of it.
APCS says that the frame pointer does not need to be pushed in leaf
functions, or simple tail call functions. */
#define FRAME_POINTER_REQUIRED \
(current_function_has_nonlocal_label \
#define FRAME_POINTER_REQUIRED \
(current_function_has_nonlocal_label \
|| (TARGET_ARM && TARGET_APCS_FRAME && ! leaf_function_p ()))
/* Return number of consecutive hard regs needed starting at reg REGNO
@ -2758,12 +2758,12 @@ extern int making_const_table;
#define HOST_UINT(x) ((unsigned HOST_WIDE_INT) x)
#endif
#define ARM_SIGN_EXTEND(x) ((HOST_WIDE_INT) \
(HOST_BITS_PER_WIDE_INT <= 32 ? (x) \
: (((x) & HOST_UINT (0xffffffff)) | \
(((x) & HOST_UINT (0x80000000)) \
? ((~ HOST_INT (0)) \
& ~ HOST_UINT(0xffffffff)) \
#define ARM_SIGN_EXTEND(x) ((HOST_WIDE_INT) \
(HOST_BITS_PER_WIDE_INT <= 32 ? (unsigned HOST_WIDE_INT) (x) \
: ((((unsigned HOST_WIDE_INT)(x)) & HOST_UINT (0xffffffff)) |\
((((unsigned HOST_WIDE_INT)(x)) & HOST_UINT (0x80000000)) \
? ((~ HOST_UINT (0)) \
& ~ HOST_UINT(0xffffffff)) \
: 0))))
/* Output the address of an operand. */