From 77e69ee7ce0715c39b9a0cde68ff44fe467435ef Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Sat, 8 Apr 2023 12:17:52 +1000 Subject: powerpc/64: modules support building with PCREL addresing Build modules using PCREL addressing when CONFIG_PPC_KERNEL_PCREL=y. - The module loader must handle several new relocation types: * R_PPC64_REL24_NOTOC is a function call handled like R_PPC_REL24, but does not restore r2 upon return. The external function call stub is changed to use pcrel addressing to load the function pointer rather than based on the module TOC. * R_PPC64_GOT_PCREL34 is a reference to external data. A GOT table must be built by hand, because the linker adds this during the final link (which is not done for kernel modules). The GOT table is built similarly to the way the external function call stub table is. This section is called .mygot because .got has a special meaning for the linker and can become upset. * R_PPC64_PCREL34 is used for local data addressing, but there is a special case where the percpu section is moved at load-time to the percpu area which is out of range of this relocation. This requires the PCREL34 relocations are converted to use GOT_PCREL34 addressing. Signed-off-by: Nicholas Piggin [mpe: Some coding style & formatting fixups] Signed-off-by: Michael Ellerman Link: https://msgid.link/20230408021752.862660-7-npiggin@gmail.com --- arch/powerpc/include/asm/ppc_asm.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/powerpc/include/asm/ppc_asm.h') diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h index 4dfabf4ef966..5f05a984b103 100644 --- a/arch/powerpc/include/asm/ppc_asm.h +++ b/arch/powerpc/include/asm/ppc_asm.h @@ -183,7 +183,7 @@ /* * Used to name C functions called from asm */ -#if defined(CONFIG_PPC_KERNEL_PCREL) && !defined(MODULE) +#ifdef CONFIG_PPC_KERNEL_PCREL #define CFUNC(name) name@notoc #else #define CFUNC(name) name @@ -216,7 +216,7 @@ .globl name; \ name: -#if defined(CONFIG_PPC_KERNEL_PCREL) && !defined(MODULE) +#ifdef CONFIG_PPC_KERNEL_PCREL #define _GLOBAL_TOC _GLOBAL #else #define _GLOBAL_TOC(name) \ @@ -379,7 +379,7 @@ n: ori reg, reg, (expr)@l; \ rldimi reg, tmp, 32, 0 -#if defined(CONFIG_PPC_KERNEL_PCREL) && !defined(MODULE) +#ifdef CONFIG_PPC_KERNEL_PCREL #define LOAD_REG_ADDR(reg,name) \ pla reg,name@pcrel -- cgit v1.2.3