binutils-gdb/ld/testsuite/ld-powerpc/notoc3.s

 .text
 .globl f1, f2, g1, g2, _start
 .weak ext
 .abiversion 2

f1:
 .localentry f1,1
 bl f1@notoc
 bl f2@notoc
 bl g1@notoc
 bl g2@notoc
 bl ext@notoc
 blr

g1:
 .localentry g1,1
 bl f2@notoc
 bl f1@notoc
 bl g2@notoc
 bl g1@notoc
 blr

f2:
0:
 addis 2,12,.TOC.-0b@ha
 addi 2,2,.TOC.-0b@l
 .localentry f2,.-0b
 bl f1
 nop
 bl f2
 nop
 bl g1
 nop
 bl g2
 nop
 bl ext
 nop
 blr

g2:
0:
 addis 2,12,.TOC.-0b@ha
 addi 2,2,.TOC.-0b@l
 .localentry g2,.-0b
 bl f2
 nop
 bl f1
 nop
 bl g2
 nop
 bl g1
 nop
 blr

_start:
 .cfi_startproc
 b _start
 pld 3,_start
 .cfi_endproc
Power10 stub selection This patch better supports mixing of power10 and non-power10 code, as might be seen in a cpu-optimized library using ifuncs to select functions optimized for a given cpu. Using -Wl,--no-power10-stubs isn't that good in this situation since non-power10 notoc stubs are slower and larger than the power10 variants, which you'd like to use on power10 code paths. With this change, power10 pc-relative code that makes calls marked @notoc uses power10 stubs if stubs are necessary, and other calls use non-power10 instructions in stubs. This will mean that if gcc is generating code for -mcpu=power10 but with pc-rel disabled then you'll get the older stubs even on power10 (unless you force with -Wl,--power10-stubs). That shouldn't be too big a problem: stubs that use r2 are reasonable. It's just the ones that set up addressing using "mflr 12; bcl 20,31,.+4; mflr 11; mtlr 12" that should be avoided if possible. bfd/ * elf64-ppc.c (struct ppc_link_hash_table): Add has_power10_relocs. (select_alt_stub): New function. (ppc_get_stub_entry): Use it here. (ppc64_elf_check_relocs): Set had_power10_relocs rather than power10_stubs. (ppc64_elf_size_stubs): Clear power10_stubs here instead. Don't merge notoc stubs with other varieties when power10_stubs is "auto". Instead dup the stub hash table entry. (plt_stub_size, ppc_build_one_stub, ppc_size_one_stub): Adjust tests of power10_stubs. ld/ * emultempl/ppc64elf.em (power10-stubs): Accept optional "auto" arg. * ld.texi (power10-stubs): Update. * testsuite/ld-powerpc/callstub-1.d: Force --power10-stubs. * testsuite/ld-powerpc/callstub-2.d: Relax branch offset comparison. * testsuite/ld-powerpc/callstub-4.d: New test. * testsuite/ld-powerpc/notoc.d: Force --no-power10-stubs. * testsuite/ld-powerpc/notoc3.d, * testsuite/ld-powerpc/notoc3.s, * testsuite/ld-powerpc/notoc3.wf: New test. * testsuite/ld-powerpc/powerpc.exp: Run new tests. Pass --no-power10-stubs for notoc link. 2020-07-17 15:17:28 +08:00			`.text`
			`.globl f1, f2, g1, g2, _start`
			`.weak ext`
			`.abiversion 2`

			`f1:`
			`.localentry f1,1`
			`bl f1@notoc`
			`bl f2@notoc`
			`bl g1@notoc`
			`bl g2@notoc`
			`bl ext@notoc`
			`blr`

			`g1:`
			`.localentry g1,1`
			`bl f2@notoc`
			`bl f1@notoc`
			`bl g2@notoc`
			`bl g1@notoc`
			`blr`

			`f2:`
			`0:`
			`addis 2,12,.TOC.-0b@ha`
			`addi 2,2,.TOC.-0b@l`
			`.localentry f2,.-0b`
			`bl f1`
			`nop`
			`bl f2`
			`nop`
			`bl g1`
			`nop`
			`bl g2`
			`nop`
			`bl ext`
			`nop`
			`blr`

			`g2:`
			`0:`
			`addis 2,12,.TOC.-0b@ha`
			`addi 2,2,.TOC.-0b@l`
			`.localentry g2,.-0b`
			`bl f2`
			`nop`
			`bl f1`
			`nop`
			`bl g2`
			`nop`
			`bl g1`
			`nop`
			`blr`

			`_start:`
			`.cfi_startproc`
			`b _start`
			`pld 3,_start`
			`.cfi_endproc`