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Fixup the save/restore register macros.

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I believe these macros obey the C calling convention, so we need to
allocate our stack frame and save all callee-save registers. We
can tune it later if it turns out we don't need all the registers.
This commit is contained in:
Michael Munday 2016-11-22 13:58:10 -05:00
parent d505a0e0ba
commit 5a69b4638a
1 changed files with 15 additions and 8 deletions
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23
src/vm_s390x.dasc
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@ -80,16 +80,23 @@
|// Callee save area (allocated by interpreter).
|.define CALLEESAVE 000(SP) // <- SP in interpreter.
|
|.macro savereg arg1 arg2 arg3
| STG arg1; // Store 64bit content
| STG arg2; // Store 64bit content
| STG arg3; // Store 64bit content
|.macro saveregs
| lay SP, -CFRAME_SPACE(SP) // Allocate stack frame.
| stmg r6, r15, SAVE_GPRS // Technically we restore r15 regardless.
| std f0, SAVE_FPR0
| std f2, SAVE_FPR2
| std f4, SAVE_FPR4
| std f6, SAVE_FPR6
|.endmacro
|
|.macro restreg arg1 arg2 arg3
| LG arg1; // Load 64 bit content
| LG arg2; // Load 64 bit content
| LG arg3; // Load 64 bit content
|.macro restoreregs
| la SP, CFRAME_SPACE(SP) // De-allocate stack frame.
| lmg r6, r15, SAVE_GPRS // Technically we restore r15 regardless.
| ld f0, SAVE_FPR0
| ld f2, SAVE_FPR2
| ld f4, SAVE_FPR4
| ld f6, SAVE_FPR6
|// br r14 to return?
|.endmacro
|
|// Type definitions. Some of these are only used for documentation.