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(TRAMPOLINE_TEMPLATE, TRAMPOLINE_SIZE, INITIALIZE_TRAMPOLINE): Avoid need for helper function.

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(TRAMPOLINE_TEMPLATE, TRAMPOLINE_SIZE, INITIALIZE_TRAMPOLINE): Avoid need for
helper function.
(TRAMPOLINE_ALIGNMENT): Renamed from TRAMPOLINE_ALIGN.

From-SVN: r11134
This commit is contained in:
Richard Kenner 1996-01-31 08:23:56 -05:00
parent 270eeaa5a8
commit e73cbb044a
1 changed files with 20 additions and 26 deletions
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46
gcc/config/m68k/m68k.h
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@ -993,41 +993,33 @@ while(0)
of a trampoline, leaving space for the variable parts. */
/* On the 68k, the trampoline looks like this:
mov @#.,a0
jsr @#___trampoline
jsr @#___trampoline
movl pc@(8),a0
movl pc@(8),sp@-
rts
.long STATIC
.long FUNCTION
The reason for having three jsr insns is so that an entire line
of the instruction cache is filled in a predictable way
that will always be the same.
We always use the assembler label ___trampoline
regardless of whether the system adds underscores. */
The use of pc relative addressing mode ensures that the constants are
accessed through the data cache. */
#define TRAMPOLINE_TEMPLATE(FILE) \
{ \
ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x207c)); \
ASM_OUTPUT_SHORT (FILE, const0_rtx); \
ASM_OUTPUT_SHORT (FILE, const0_rtx); \
ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x4eb9)); \
ASM_OUTPUT_INT (FILE, gen_rtx (SYMBOL_REF, SImode, "*___trampoline"));\
ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x4eb9)); \
ASM_OUTPUT_INT (FILE, gen_rtx (SYMBOL_REF, SImode, "*___trampoline"));\
ASM_OUTPUT_SHORT (FILE, const0_rtx); \
ASM_OUTPUT_SHORT (FILE, const0_rtx); \
ASM_OUTPUT_SHORT (FILE, const0_rtx); \
ASM_OUTPUT_SHORT (FILE, const0_rtx); \
ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x207a)); \
ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 8)); \
ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x2f3a)); \
ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 8)); \
ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x4e75)); \
ASM_OUTPUT_INT (FILE, const0_rtx); \
ASM_OUTPUT_INT (FILE, const0_rtx); \
}
/* Length in units of the trampoline for entering a nested function. */
#define TRAMPOLINE_SIZE 26
#define TRAMPOLINE_SIZE 18
/* Alignment required for a trampoline. 16 is used to find the
beginning of a line in the instruction cache. */
#define TRAMPOLINE_ALIGN 16
#define TRAMPOLINE_ALIGNMENT 16
/* Emit RTL insns to initialize the variable parts of a trampoline.
FNADDR is an RTX for the address of the function's pure code.
@ -1035,14 +1027,16 @@ regardless of whether the system adds underscores. */
#define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT) \
{ \
emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 2)), TRAMP); \
emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 18)), CXT); \
emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 22)), FNADDR); \
emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 10)), CXT); \
emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 14)), FNADDR); \
}
/* This is the library routine that is used
to transfer control from the trampoline
to the actual nested function. */
to the actual nested function.
It is defined for backward compatibility,
for linking with object code that used the old
trampoline definition. */
/* A colon is used with no explicit operands
to cause the template string to be scanned for %-constructs. */