Calling C Functions from Forth and Vice Versa
Procedure Call Standard for the ARM Architecture AAPCS
https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/on-the-aapcs-with-an-application-to-efficient-parameter-passing
| Register | AAPCS Purpose |
MECRISP Forth Purpose |
|---|---|---|
| r0 | Argument, result, scratch register 1 | Scratch |
| r1 | Argument, result, scratch register 2 | Scratch |
| r2 | Argument, scratch register 3 | Scratch |
| r3 | Argument, scratch register 4 | Scratch |
| r12 | Intra-procedure-call scratch register | |
| r14 | Link register (LR) | Link register (LR) |
| r9 | Platform register (usage defined by platform in use) | |
| r15 | Program counter (PC) | Program counter (PC) |
| r13 | Stack pointer (SP) | Stack pointer (SP) |
| r4 | Variable register 1 | |
| r5 | Variable register 2 | |
| r6 | Variable register 3 | Top Of Stack TOS |
| r7 | Variable register 4 | Data Stack |
| r8 | Variable register 5 | |
| r10 | Variable register 7 | |
| r11 | Variable register 8 |
Peter Schmid - 2020-07-13
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Topic revision: r1 - 2020-07-13 - PeterSchmid
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