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// Copyright 2023 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // When linking C ELFv2 objects, the Go linker may need to insert calling stubs. // A call stub is usually needed when the ELFv2 st_other attribute is different // between caller and callee. // // The type of call stub inserted will vary depending on GOPPC64 and the // buildmode (e.g pie builds shared code, default builds fixed-position code). // CI is set up to run for P8 and P10 machines, and this test is run in both // pie and default modes. // // Several functions are written with interesting st_other attributes, and // call each other to test various calling combinations which require stubs. // // The call tree is as follows, starting from TestPPC64Stubs (A C function): // TestPPC64Stubs (compiled PIC by default by Go) // notoc_func [called TOC -> NOTOC (but R2 is preserved)] // toc_func [called NOTOC -> TOC] // notoc_nor2_func [called TOC -> NOTOC] // random [dynamic TOC call] // random [dynamic NOTOC call] // // Depending on the GOPPC64/buildmode used, and type of call, one of 7 stubs may need inserted: // // TOC -> NOTOC: Save R2, call global entry. (valid for any GOPPC64) // TOC save slot is rewrittent to restore TOC. // NOTOC -> TOC [P10]: A PIC call stub using P10 instructions to call the global entry // NOTOC -> TOC [P8]: A PIC call stub using P8 instructions to call the global entry // // TOC -> dynamic: A PLT call stub is generated which saves R2. // TOC save slot is rewritten to restore TOC. // NOTOC -> dynamic [P10]: A stub using pcrel instructions is generated. // NOTOC -> dynamic [P8/default]: A P8 compatible, non-PIC stub is generated // NOTOC -> dynamic [P8/pie]: A P8 compatible, PIC stub is generated // // // Some notes about other cases: // TOC -> TOC, NOTOC -> NOTOC, NOTOC -> TOC local calls do not require require call stubs. // TOC -> NOTOC (R2 is preserved, st_other==0): A special case where a call stub is not needed. // This test requires a binutils with power10 and ELFv2 1.5 support. This is earliest verified version. .if .gasversion. >= 23500 // A function which does not guarantee R2 is preserved. // R2 is clobbered here to ensure the stubs preserve it. .globl notoc_nor2_func .type notoc_nor2_func, @function notoc_nor2_func: .localentry notoc_nor2_func,1 li 2,0 blr // A function which expects R2 to hold TOC, and has a distinct local entry. .globl toc_func .type toc_func, @function toc_func: addis 2,12,.TOC.-toc_func@ha addi 2,2,.TOC.-toc_func@l .localentry toc_func, .-toc_func mflr 0 std 0,16(1) stdu 1,-32(1) // Call a NOTOC function which clobbers R2. bl notoc_nor2_func nop // Call libc random. This should generate a TOC relative plt stub. bl random nop addi 1,1,32 ld 0,16(1) mtlr 0 blr // An ELFv2 st_other==0 function. It preserves R2 (TOC), but does not use it. .globl notoc_func .type notoc_func, @function notoc_func: // Save R2 and LR and stack a frame. mflr 0 std 0,16(1) stdu 1,-32(1) // Save R2 in TOC save slot. std 2,24(1) // clobber R2 li 2,0 // Call type2_func. A call stub from notoc to toc should be inserted. bl toc_func@notoc // Call libc random. A notoc plt stub should be inserted. bl random@notoc // Return 0 to indicate the test ran. li 3,0 // Restore R2 ld 2,24(1) // Restore LR and pop stack addi 1,1,32 ld 0,16(1) mtlr 0 blr .else // A stub for older binutils .globl notoc_func .type notoc_func, @function notoc_func: // Return 1 to indicate the test was skipped. li 3,1 blr .endif