When building the kernel in size optimized mode with the amdgpu module enabled, gcc will begin referencing external gpr1 and fpu save/restore functions. This will then cause a linker failure as we do not link against libgcc which normally contains those builtin functions.
Implement gpr1 and fpu save/restore functions per the ABI v2 documentation. Tested on a Talos II with a WX7100 installed and running in DisplayCore mode. Reported-by: kernel test robot <[email protected]> Tested-by: Timothy Pearson <[email protected]> Signed-off-by: Timothy Pearson <[email protected]> --- arch/powerpc/kernel/prom_init_check.sh | 4 +- arch/powerpc/lib/crtsavres.S | 244 +++++++++++++++++++++++++ scripts/mod/modpost.c | 4 + 3 files changed, 250 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh index 69623b9045d5..76c5651e29d3 100644 --- a/arch/powerpc/kernel/prom_init_check.sh +++ b/arch/powerpc/kernel/prom_init_check.sh @@ -72,10 +72,10 @@ do # ignore register save/restore funcitons case $UNDEF in - _restgpr_*|_restgpr0_*|_rest32gpr_*) + _restgpr_*|_restgpr0_*|_restgpr1_*|_rest32gpr_*) OK=1 ;; - _savegpr_*|_savegpr0_*|_save32gpr_*) + _savegpr_*|_savegpr0_*|_restgpr0_*|_save32gpr_*) OK=1 ;; esac diff --git a/arch/powerpc/lib/crtsavres.S b/arch/powerpc/lib/crtsavres.S index 7e5e1c28e56a..6cd870aacd7f 100644 --- a/arch/powerpc/lib/crtsavres.S +++ b/arch/powerpc/lib/crtsavres.S @@ -3,6 +3,7 @@ * * Copyright (C) 1995, 1996, 1998, 2000, 2001 Free Software Foundation, Inc. * Copyright 2008 Freescale Semiconductor, Inc. + * Copyright 2024 Raptor Engineering, LLC * Written By Michael Meissner * * Based on gcc/config/rs6000/crtsavres.asm from gcc @@ -435,6 +436,127 @@ _restgpr0_31: mtlr r0 blr +.globl _savegpr1_14 +_savegpr1_14: + std r14,-144(r12) +.globl _savegpr1_15 +_savegpr1_15: + std r15,-136(r12) +.globl _savegpr1_16 +_savegpr1_16: + std r16,-128(r12) +.globl _savegpr1_17 +_savegpr1_17: + std r17,-120(r12) +.globl _savegpr1_18 +_savegpr1_18: + std r18,-112(r12) +.globl _savegpr1_19 +_savegpr1_19: + std r19,-104(r12) +.globl _savegpr1_20 +_savegpr1_20: + std r20,-96(r12) +.globl _savegpr1_21 +_savegpr1_21: + std r21,-88(r12) +.globl _savegpr1_22 +_savegpr1_22: + std r22,-80(r12) +.globl _savegpr1_23 +_savegpr1_23: + std r23,-72(r12) +.globl _savegpr1_24 +_savegpr1_24: + std r24,-64(r12) +.globl _savegpr1_25 +_savegpr1_25: + std r25,-56(r12) +.globl _savegpr1_26 +_savegpr1_26: + std r26,-48(r12) +.globl _savegpr1_27 +_savegpr1_27: + std r27,-40(r12) +.globl _savegpr1_28 +_savegpr1_28: + std r28,-32(r12) +.globl _savegpr1_29 +_savegpr1_29: + std r29,-24(r12) +.globl _savegpr1_30 +_savegpr1_30: + std r30,-16(r12) +.globl _savegpr1_31 +_savegpr1_31: + std r31,-8(r12) + std r0,16(r12) + blr + +.globl _restgpr1_14 +_restgpr1_14: + ld r14,-144(r12) +.globl _restgpr1_15 +_restgpr1_15: + ld r15,-136(r12) +.globl _restgpr1_16 +_restgpr1_16: + ld r16,-128(r12) +.globl _restgpr1_17 +_restgpr1_17: + ld r17,-120(r12) +.globl _restgpr1_18 +_restgpr1_18: + ld r18,-112(r12) +.globl _restgpr1_19 +_restgpr1_19: + ld r19,-104(r12) +.globl _restgpr1_20 +_restgpr1_20: + ld r20,-96(r12) +.globl _restgpr1_21 +_restgpr1_21: + ld r21,-88(r12) +.globl _restgpr1_22 +_restgpr1_22: + ld r22,-80(r12) +.globl _restgpr1_23 +_restgpr1_23: + ld r23,-72(r12) +.globl _restgpr1_24 +_restgpr1_24: + ld r24,-64(r12) +.globl _restgpr1_25 +_restgpr1_25: + ld r25,-56(r12) +.globl _restgpr1_26 +_restgpr1_26: + ld r26,-48(r12) +.globl _restgpr1_27 +_restgpr1_27: + ld r27,-40(r12) +.globl _restgpr1_28 +_restgpr1_28: + ld r28,-32(r12) +.globl _restgpr1_29 +_restgpr1_29: + ld r0,16(r12) + ld r29,-24(r12) + mtlr r0 + ld r30,-16(r12) + ld r31,-8(r12) + blr + +.globl _restgpr1_30 +_restgpr1_30: + ld r30,-16(r12) +.globl _restgpr1_31 +_restgpr1_31: + ld r0,16(r12) + ld r31,-8(r12) + mtlr r0 + blr + #ifdef CONFIG_ALTIVEC /* Called with r0 pointing just beyond the end of the vector save area. */ @@ -540,6 +662,128 @@ _restvr_31: #endif /* CONFIG_ALTIVEC */ +#ifdef CONFIG_PPC_FPU + +.globl _savefpr_14 +_savefpr_14: + stfd f14,-144(r1) +.globl _savefpr_15 +_savefpr_15: + stfd f15,-136(r1) +.globl _savefpr_16 +_savefpr_16: + stfd f16,-128(r1) +.globl _savefpr_17 +_savefpr_17: + stfd f17,-120(r1) +.globl _savefpr_18 +_savefpr_18: + stfd f18,-112(r1) +.globl _savefpr_19 +_savefpr_19: + stfd f19,-104(r1) +.globl _savefpr_20 +_savefpr_20: + stfd f20,-96(r1) +.globl _savefpr_21 +_savefpr_21: + stfd f21,-88(r1) +.globl _savefpr_22 +_savefpr_22: + stfd f22,-80(r1) +.globl _savefpr_23 +_savefpr_23: + stfd f23,-72(r1) +.globl _savefpr_24 +_savefpr_24: + stfd f24,-64(r1) +.globl _savefpr_25 +_savefpr_25: + stfd f25,-56(r1) +.globl _savefpr_26 +_savefpr_26: + stfd f26,-48(r1) +.globl _savefpr_27 +_savefpr_27: + stfd f27,-40(r1) +.globl _savefpr_28 +_savefpr_28: + stfd f28,-32(r1) +.globl _savefpr_29 +_savefpr_29: + stfd f29,-24(r1) +.globl _savefpr_30 +_savefpr_30: + stfd f30,-16(r1) +.globl _savefpr_31 +_savefpr_31: + stfd f31,-8(r1) + std r0, 16(r1) + blr + +.globl _restfpr_14 +_restfpr_14: + lfd f14,-144(r1) +.globl _restfpr_15 +_restfpr_15: + lfd f15,-136(r1) +.globl _restfpr_16 +_restfpr_16: + lfd f16,-128(r1) +.globl _restfpr_17 +_restfpr_17: + lfd f17,-120(r1) +.globl _restfpr_18 +_restfpr_18: + lfd f18,-112(r1) +.globl _restfpr_19 +_restfpr_19: + lfd f19,-104(r1) +.globl _restfpr_20 +_restfpr_20: + lfd f20,-96(r1) +.globl _restfpr_21 +_restfpr_21: + lfd f21,-88(r1) +.globl _restfpr_22 +_restfpr_22: + lfd f22,-80(r1) +.globl _restfpr_23 +_restfpr_23: + lfd f23,-72(r1) +.globl _restfpr_24 +_restfpr_24: + lfd f24,-64(r1) +.globl _restfpr_25 +_restfpr_25: + lfd f25,-56(r1) +.globl _restfpr_26 +_restfpr_26: + lfd f26,-48(r1) +.globl _restfpr_27 +_restfpr_27: + lfd f27,-40(r1) +.globl _restfpr_28 +_restfpr_28: + lfd f28,-32(r1) +.globl _restfpr_29 +_restfpr_29: + ld r0, 16(r1) + lfd f29,-24(r1) + mtlr r0 + lfd f30,-16(r1) + lfd f31,-8(r1) + blr +.globl _restfpr_30 +_restfpr_30: + lfd f30,-16(r1) +.globl _restfpr_31 +_restfpr_31: + ld r0, 16(r1) + lfd f31,-8(r1) + +#endif /* CONFIG_PPC_FPU */ + #endif /* CONFIG_PPC64 */ #endif diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 267b9a0a3abc..153a163ba3f7 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -597,8 +597,12 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname) /* Special register function linked on all modules during final link of .ko */ if (strstarts(symname, "_restgpr0_") || strstarts(symname, "_savegpr0_") || + strstarts(symname, "_restgpr1_") || + strstarts(symname, "_savegpr1_") || strstarts(symname, "_restvr_") || strstarts(symname, "_savevr_") || + strstarts(symname, "_restfpr_") || + strstarts(symname, "_savefpr_") || strcmp(symname, ".TOC.") == 0) return 1; -- 2.39.2
