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don't save the FP explicitly on a syscall, as they preserve all regs anyway except scratch regs

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git-svn-id: trunk@27078 -
This commit is contained in:
Károly Balogh 2014-03-10 13:39:51 +00:00
parent 088c4fce57
commit 73f8c956e0
1 changed files with 5 additions and 13 deletions
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18
compiler/m68k/n68kcal.pas
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@ -50,27 +50,19 @@ implementation
procedure tm68kcallnode.do_syscall;
var
tmpref: treference;
tmpref2: treference;
begin
case target_info.system of
system_m68k_amiga:
begin
if po_syscall_legacy in tprocdef(procdefinition).procoptions then
begin
{ save base pointer on syscalls }
{ FIXME: probably this will need to be extended to save all regs (KB) }
reference_reset_base(tmpref2, NR_STACK_POINTER_REG, 0, 4);
tmpref2.direction := dir_dec;
current_asmdata.CurrAsmList.concat(taicpu.op_reg_ref(A_MOVE,S_L,NR_FRAME_POINTER_REG,tmpref2));
{ the actuall call }
{ according to Amiga Developer CD 2.1, system functions destroy the
scratch regs D0-D1 and A0-A1, but preserve all other regs. A6 is
not used as FP on Amiga any more (we use A5), so we don't need to
save it. (KB)
http://amigadev.elowar.com/read/ADCD_2.1/Libraries_Manual_guide/node0290.html }
reference_reset_base(tmpref,NR_A6,-tprocdef(procdefinition).extnumber,4);
current_asmdata.CurrAsmList.concat(taicpu.op_ref(A_JSR,S_NO,tmpref));
{ restore frame pointer }
reference_reset_base(tmpref2, NR_STACK_POINTER_REG, 0, 4);
tmpref2.direction := dir_inc;
current_asmdata.CurrAsmList.concat(taicpu.op_ref_reg(A_MOVE,S_L,tmpref2,NR_FRAME_POINTER_REG));
end
else
internalerror(2005010403);