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| author | Jan Hubicka <jh@suse.cz> | 2001-04-05 19:18:42 +0200 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2001-04-05 17:18:42 +0000 |
| commit | 0ed08620808411f590329745e901c998a0d7f408 (patch) | |
| tree | bf9672e66fd1e53dd0aef46ae1f998d9353b68a1 /gcc/config | |
| parent | ac62a60e1ff8375219584e263fb97853e5f90b8c (diff) | |
| download | gcc-0ed08620808411f590329745e901c998a0d7f408.zip gcc-0ed08620808411f590329745e901c998a0d7f408.tar.gz gcc-0ed08620808411f590329745e901c998a0d7f408.tar.bz2 | |
i386.c (x86_initialize_trampoline): New global function.
* i386.c (x86_initialize_trampoline): New global function.
* i386.h (TRAMPOLINE_SIZE): Size is 23 for x86_64.
(INITIALIZE_TRAMPOLINE): Move offline.
* i386-protos.h (x86_initialize_trampoline): Declare.
From-SVN: r41123
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/i386.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 0c79e70..a3bbc78 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -8936,6 +8936,66 @@ ix86_local_alignment (type, align) } return align; } + +/* Emit RTL insns to initialize the variable parts of a trampoline. + FNADDR is an RTX for the address of the function's pure code. + CXT is an RTX for the static chain value for the function. */ +void +x86_initialize_trampoline (tramp, fnaddr, cxt) + rtx tramp, fnaddr, cxt; +{ + if (!TARGET_64BIT) + { + /* Compute offset from the end of the jmp to the target function. */ + rtx disp = expand_binop (SImode, sub_optab, fnaddr, + plus_constant (tramp, 10), + NULL_RTX, 1, OPTAB_DIRECT); + emit_move_insn (gen_rtx_MEM (QImode, tramp), + GEN_INT (trunc_int_for_mode (0xb9, QImode))); + emit_move_insn (gen_rtx_MEM (SImode, plus_constant (tramp, 1)), cxt); + emit_move_insn (gen_rtx_MEM (QImode, plus_constant (tramp, 5)), + GEN_INT (trunc_int_for_mode (0xe9, QImode))); + emit_move_insn (gen_rtx_MEM (SImode, plus_constant (tramp, 6)), disp); + } + else + { + int offset = 0; + /* Try to load address using shorter movl instead of movabs. + We may want to support movq for kernel mode, but kernel does not use + trampolines at the moment. */ + if (x86_64_zero_extended_value (fnaddr)) + { + fnaddr = copy_to_mode_reg (DImode, fnaddr); + emit_move_insn (gen_rtx_MEM (HImode, plus_constant (tramp, offset)), + GEN_INT (trunc_int_for_mode (0xbb41, HImode))); + emit_move_insn (gen_rtx_MEM (SImode, plus_constant (tramp, offset + 2)), + gen_lowpart (SImode, fnaddr)); + offset += 6; + } + else + { + emit_move_insn (gen_rtx_MEM (HImode, plus_constant (tramp, offset)), + GEN_INT (trunc_int_for_mode (0xbb49, HImode))); + emit_move_insn (gen_rtx_MEM (DImode, plus_constant (tramp, offset + 2)), + fnaddr); + offset += 10; + } + /* Load static chain using movabs to r10. */ + emit_move_insn (gen_rtx_MEM (HImode, plus_constant (tramp, offset)), + GEN_INT (trunc_int_for_mode (0xba49, HImode))); + emit_move_insn (gen_rtx_MEM (DImode, plus_constant (tramp, offset + 2)), + cxt); + offset += 10; + /* Jump to the r11 */ + emit_move_insn (gen_rtx_MEM (HImode, plus_constant (tramp, offset)), + GEN_INT (trunc_int_for_mode (0xff49, HImode))); + emit_move_insn (gen_rtx_MEM (QImode, plus_constant (tramp, offset+2)), + GEN_INT (trunc_int_for_mode (0xe3, HImode))); + offset += 3; + if (offset > TRAMPOLINE_SIZE) + abort(); + } +} #define def_builtin(NAME, TYPE, CODE) \ builtin_function ((NAME), (TYPE), (CODE), BUILT_IN_MD, NULL_PTR) |