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| author | Richard Kenner <kenner@gcc.gnu.org> | 1996-01-31 08:23:56 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1996-01-31 08:23:56 -0500 |
| commit | e73cbb044ab0895a2a7958df8cd193d1af7eabf0 (patch) | |
| tree | 843e0f48fa6b1b9828b5b7158d27dfc63473fb63 /gcc | |
| parent | 270eeaa5a8aa964dd14e8db99af0885f2b3146f4 (diff) | |
| download | gcc-e73cbb044ab0895a2a7958df8cd193d1af7eabf0.zip gcc-e73cbb044ab0895a2a7958df8cd193d1af7eabf0.tar.gz gcc-e73cbb044ab0895a2a7958df8cd193d1af7eabf0.tar.bz2 | |
(TRAMPOLINE_TEMPLATE, TRAMPOLINE_SIZE, INITIALIZE_TRAMPOLINE): Avoid need for helper function.
(TRAMPOLINE_TEMPLATE, TRAMPOLINE_SIZE, INITIALIZE_TRAMPOLINE): Avoid need for
helper function.
(TRAMPOLINE_ALIGNMENT): Renamed from TRAMPOLINE_ALIGN.
From-SVN: r11134
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/m68k/m68k.h | 46 |
1 files changed, 20 insertions, 26 deletions
diff --git a/gcc/config/m68k/m68k.h b/gcc/config/m68k/m68k.h index 60f3063..3ce56e1 100644 --- a/gcc/config/m68k/m68k.h +++ b/gcc/config/m68k/m68k.h @@ -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. */ |