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Initial RISC-V 64-bit Support (gnustep#261)
* RISC-V objc_msgSend implementation * Use objc_msgSend.riscv64.S if requirements are met * RISC-V 64-bit block trampoline * Fix formatting * Add riscv64 crossbuild in CI * Exclude llvm 13 and 14 for riscv64 in CI * Add RISC-V and Windows on ARM to ANNOUNCE * Add comment to why we exclude architectures in qemu-crossbuild * Remove duplicated entry in ANNOUNCE
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| #define ARGUMENT_SPILL_SIZE (10*8 + 8*8) | ||
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| .macro MSGSEND receiver, sel | ||
| .cfi_startproc | ||
| beqz \receiver, 3f // Skip everything if receiver is nil | ||
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| andi t0, \receiver, SMALLOBJ_MASK | ||
| bnez t0, 5f | ||
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| ld t0, 0(\receiver) // Load class into t0 | ||
| 0: | ||
| ld t0, DTABLE_OFFSET(t0) // dtable -> t0 | ||
| ld t1, 0(\sel) // selector->index -> t1 | ||
| ld t2, SHIFT_OFFSET(t0) // dtable->shift -> t2 | ||
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| li t3, 8 | ||
| beq t2, t3, 1f | ||
| beqz t2, 2f | ||
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| srli t2, t1, 16-3 // Extract byte 3 of sel index and multiply by 2^3 | ||
| and t2, t2, 0x7F8 // Mask target byte | ||
| // Example: ((0xCAFEBA >> 13) & 0x7f8) == (0xCA << 3) | ||
| add t2, t0, t2 // t2 = dtable address + offset | ||
| ld t0, DATA_OFFSET(t2) // Load, adding in the data offset | ||
| 1: | ||
| srli t2, t1, 8-3 // Extract byte 2 of sel index and multiply by 2^3 | ||
| and t2, t2, 0x7F8 // Mask target byte | ||
| add t2, t0, t2 // t2 = dtable address + offset | ||
| ld t0, DATA_OFFSET(t2) // Load, adding in the data offset | ||
| 2: | ||
| slli t2, t1, 3 // Multiply by 2^3 | ||
| and t2, t2, 0x7F8 // Mask target byte | ||
| add t2, t0, t2 // t2 = dtable address + offset | ||
| ld t0, DATA_OFFSET(t2) // Load, adding in the data offset | ||
| // Slot pointer is now in t0 | ||
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| beqz t0, 4f // If the slot is nil, go to the C path | ||
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| ld t0, SLOT_OFFSET(t0) // Load the method from the slot | ||
| jalr zero, t0, 0 // Tail-call the method | ||
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| 3: | ||
| li \receiver, 0 | ||
| li \sel, 0 | ||
| fmv.d.x fa0, zero | ||
| fmv.d.x fa1, zero | ||
| jalr zero, ra, 0 | ||
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| 4: | ||
| add sp, sp, -(ARGUMENT_SPILL_SIZE) | ||
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| // Spill function arguments | ||
| sd a0, 0(sp) | ||
| sd a1, 8(sp) | ||
| sd a2, 16(sp) | ||
| sd a3, 24(sp) | ||
| sd a4, 32(sp) | ||
| sd a5, 40(sp) | ||
| sd a6, 48(sp) | ||
| sd a7, 56(sp) | ||
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| // Spill FP arguments | ||
| fsd fa0, 64(sp) | ||
| fsd fa1, 72(sp) | ||
| fsd fa2, 80(sp) | ||
| fsd fa3, 88(sp) | ||
| fsd fa4, 96(sp) | ||
| fsd fa5, 104(sp) | ||
| fsd fa6, 112(sp) | ||
| fsd fa7, 120(sp) | ||
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| sd fp, 128(sp) | ||
| sd ra, 136(sp) | ||
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| add fp, sp, 128 | ||
| add sp, sp, -16 | ||
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| sd \receiver, 0(sp) // it is convenient if \receiver is spilled at sp | ||
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| .cfi_def_cfa fp, 16 | ||
| .cfi_offset fp, -16 | ||
| .cfi_offset ra, -8 | ||
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| add a0, sp, zero // &self in first argument | ||
| call CDECL(slowMsgLookup) | ||
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| add t0, a0, zero // IMP -> t0 | ||
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| ld a0, 16(sp) | ||
| ld a1, 24(sp) | ||
| ld a2, 32(sp) | ||
| ld a3, 40(sp) | ||
| ld a4, 48(sp) | ||
| ld a5, 56(sp) | ||
| ld a6, 64(sp) | ||
| ld a7, 72(sp) | ||
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| fld fa0, 80(sp) | ||
| fld fa1, 88(sp) | ||
| fld fa2, 96(sp) | ||
| fld fa3, 104(sp) | ||
| fld fa4, 112(sp) | ||
| fld fa5, 120(sp) | ||
| fld fa6, 128(sp) | ||
| fld fa7, 136(sp) | ||
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| ld fp, 144(sp) | ||
| ld ra, 152(sp) | ||
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| ld \receiver, 0(sp) | ||
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| add sp, sp, ARGUMENT_SPILL_SIZE | ||
| add sp, sp, 16 | ||
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| jalr zero, t0, 0 // Tail-call the method | ||
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| 5: | ||
| // Load address of SmallObjectClasses | ||
| auipc t1, %pcrel_hi(CDECL(SmallObjectClasses)) | ||
| addi t1, t1, %pcrel_lo(5b) | ||
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| // Calculate array offset (INDEX * 2^3) | ||
| slli t0, t0, 3 | ||
| add t0, t1, t0 | ||
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| ld t0, 0(t0) | ||
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| j 0b | ||
| .cfi_endproc | ||
| .endm | ||
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| .globl CDECL(objc_msgSend_fpret) | ||
| TYPE_DIRECTIVE(CDECL(objc_msgSend_fpret), %function) | ||
| .globl CDECL(objc_msgSend) | ||
| TYPE_DIRECTIVE(CDECL(objc_msgSend), %function) | ||
| .globl CDECL(objc_msgSend_stret) | ||
| CDECL(objc_msgSend): | ||
| CDECL(objc_msgSend_fpret): | ||
| MSGSEND a0, a1 | ||
| CDECL(objc_msgSend_stret): | ||
| MSGSEND a1, a2 // Pointer to stack frame in a0 |