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* MIPS: handle restoring GP after calls without GAS macro processing, removes ugly workaround for GAS bug.

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git-svn-id: trunk@25130 -
This commit is contained in:
sergei 2013-07-19 08:04:06 +00:00
parent 4afefd6cbe
commit 9a6edd0fb8
1 changed files with 21 additions and 30 deletions
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51
compiler/mips/cgcpu.pas
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@ -378,21 +378,16 @@ begin
href.refaddr:=addr_low;
list.concat(taicpu.op_reg_ref(A_ADDIU,NR_PIC_FUNC,href));
end;
{ JAL handled as macro provides delay slot and correct restoring of GP. }
{ Doing it ourselves requires a fixup pass, because GP restore location
becomes known only in g_proc_entry, when all code is already generated. }
{ GAS <2.21 is buggy, it doesn't add delay slot in noreorder mode. As a result,
the code will crash if dealing with stack frame size >32767 or if calling
into shared library.
This can be remedied by enabling instruction reordering, but then we also
have to emit .set macro/.set nomacro pair and exclude JAL from the
list of macro instructions (because noreorder is not allowed after nomacro) }
list.concat(taicpu.op_none(A_P_SET_MACRO));
list.concat(taicpu.op_none(A_P_SET_REORDER));
list.concat(taicpu.op_reg(A_JAL,NR_PIC_FUNC));
list.concat(taicpu.op_none(A_P_SET_NOREORDER));
list.concat(taicpu.op_none(A_P_SET_NOMACRO));
list.concat(taicpu.op_reg(A_JALR,NR_PIC_FUNC));
{ Delay slot }
list.concat(taicpu.op_none(A_NOP));
{ Restore GP if in PIC mode }
if (cs_create_pic in current_settings.moduleswitches) then
begin
if TMIPSProcinfo(current_procinfo).save_gp_ref.offset=0 then
InternalError(2013071001);
list.concat(taicpu.op_reg_ref(A_LW,NR_GP,TMIPSProcinfo(current_procinfo).save_gp_ref));
end;
end;
@ -425,22 +420,18 @@ begin
if assigned(current_procinfo) and
not (pi_do_call in current_procinfo.flags) then
InternalError(2013022102);
// if (cs_create_pic in current_settings.moduleswitches) then
if (Reg <> NR_PIC_FUNC) then
list.concat(taicpu.op_reg_reg(A_MOVE,NR_PIC_FUNC,reg));
list.concat(taicpu.op_reg(A_JALR,NR_PIC_FUNC));
{ Delay slot }
list.concat(taicpu.op_none(A_NOP));
{ Restore GP if in PIC mode }
if (cs_create_pic in current_settings.moduleswitches) then
begin
if (Reg <> NR_PIC_FUNC) then
list.concat(taicpu.op_reg_reg(A_MOVE,NR_PIC_FUNC,reg));
{ See comments in a_call_name }
list.concat(taicpu.op_none(A_P_SET_MACRO));
list.concat(taicpu.op_none(A_P_SET_REORDER));
list.concat(taicpu.op_reg(A_JAL,NR_PIC_FUNC));
list.concat(taicpu.op_none(A_P_SET_NOREORDER));
list.concat(taicpu.op_none(A_P_SET_NOMACRO));
(* end
else
begin
list.concat(taicpu.op_reg(A_JALR, reg));
{ Delay slot }
list.concat(taicpu.op_none(A_NOP)); *)
if TMIPSProcinfo(current_procinfo).save_gp_ref.offset=0 then
InternalError(2013071002);
list.concat(taicpu.op_reg_ref(A_LW,NR_GP,TMIPSProcinfo(current_procinfo).save_gp_ref));
end;
end;