git: 9684658e35ab - main - libc/csu: Unify INIT_RELOCS across architectures
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Date: Fri, 18 Oct 2024 23:50:28 UTC
The branch main has been updated by jrtc27: URL: https://cgit.FreeBSD.org/src/commit/?id=9684658e35ab033c79e0519e3681d9a194976b71 commit 9684658e35ab033c79e0519e3681d9a194976b71 Author: Jessica Clarke <jrtc27@FreeBSD.org> AuthorDate: 2024-10-18 23:48:52 +0000 Commit: Jessica Clarke <jrtc27@FreeBSD.org> CommitDate: 2024-10-18 23:48:52 +0000 libc/csu: Unify INIT_RELOCS across architectures Some architectures don't need any arguments, whilst others need auxargs, which they get by passing in env thanks to INIT_RELOCS referencing the local variable in __libc_start1(_gcrt) by name. This is unnecessarily confusing, fragile (one has to look at INIT_IRELOCS's definition to see that it uses env) and duplicates code between architectures. Instead, implement it more like rtld-elf. Each architecture provides an ifunc_init that takes the auxargs directly, and those that don't need it can just ignore it. Reviewed by: kib MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D47188 --- lib/libc/csu/aarch64/Makefile.inc | 3 +-- lib/libc/csu/aarch64/reloc.c | 7 +++++++ lib/libc/csu/amd64/Makefile.inc | 3 +-- lib/libc/csu/amd64/reloc.c | 4 +++- lib/libc/csu/arm/Makefile.inc | 3 +-- lib/libc/csu/i386/Makefile.inc | 3 +-- lib/libc/csu/i386/reloc.c | 4 +++- lib/libc/csu/libc_start1.c | 28 ++++++++++++++++++++-------- lib/libc/csu/powerpc/Makefile.inc | 3 +-- lib/libc/csu/powerpc64/Makefile.inc | 3 +-- lib/libc/csu/powerpc64/reloc.c | 9 +-------- lib/libc/csu/powerpcspe/Makefile.inc | 3 +-- lib/libc/csu/riscv/Makefile.inc | 3 +-- lib/libc/csu/riscv/reloc.c | 9 +-------- 14 files changed, 43 insertions(+), 42 deletions(-) diff --git a/lib/libc/csu/aarch64/Makefile.inc b/lib/libc/csu/aarch64/Makefile.inc index b3420a638164..6c315c5e2624 100644 --- a/lib/libc/csu/aarch64/Makefile.inc +++ b/lib/libc/csu/aarch64/Makefile.inc @@ -1,4 +1,3 @@ # -CFLAGS+= -DCRT_IRELOC_RELA \ - -DINIT_IRELOCS="" +CFLAGS+= -DCRT_IRELOC_RELA diff --git a/lib/libc/csu/aarch64/reloc.c b/lib/libc/csu/aarch64/reloc.c index ead48a8ad4fb..4ba7920bcb07 100644 --- a/lib/libc/csu/aarch64/reloc.c +++ b/lib/libc/csu/aarch64/reloc.c @@ -24,6 +24,13 @@ * SUCH DAMAGE. */ +#include <sys/cdefs.h> + +static void +ifunc_init(const Elf_Auxinfo *aux __unused) +{ +} + static void crt1_handle_rela(const Elf_Rela *r) { diff --git a/lib/libc/csu/amd64/Makefile.inc b/lib/libc/csu/amd64/Makefile.inc index f14033217580..6c315c5e2624 100644 --- a/lib/libc/csu/amd64/Makefile.inc +++ b/lib/libc/csu/amd64/Makefile.inc @@ -1,4 +1,3 @@ # -CFLAGS+= -DCRT_IRELOC_RELA \ - -DINIT_IRELOCS="init_cpu_features()" +CFLAGS+= -DCRT_IRELOC_RELA diff --git a/lib/libc/csu/amd64/reloc.c b/lib/libc/csu/amd64/reloc.c index 6424d69fbd5c..f1f83db9a391 100644 --- a/lib/libc/csu/amd64/reloc.c +++ b/lib/libc/csu/amd64/reloc.c @@ -23,6 +23,8 @@ * SUCH DAMAGE. */ +#include <sys/cdefs.h> + #include <machine/specialreg.h> #include <machine/cpufunc.h> @@ -30,7 +32,7 @@ static uint32_t cpu_feature, cpu_feature2; static uint32_t cpu_stdext_feature, cpu_stdext_feature2; static void -init_cpu_features(void) +ifunc_init(const Elf_Auxinfo *aux __unused) { u_int p[4]; diff --git a/lib/libc/csu/arm/Makefile.inc b/lib/libc/csu/arm/Makefile.inc index 2534e6579f38..ddead75f874d 100644 --- a/lib/libc/csu/arm/Makefile.inc +++ b/lib/libc/csu/arm/Makefile.inc @@ -1,4 +1,3 @@ # -CFLAGS+= -DCRT_IRELOC_SUPPRESS \ - -DINIT_IRELOCS="" +CFLAGS+= -DCRT_IRELOC_SUPPRESS diff --git a/lib/libc/csu/i386/Makefile.inc b/lib/libc/csu/i386/Makefile.inc index f3f8c2b176ce..32018000e1f2 100644 --- a/lib/libc/csu/i386/Makefile.inc +++ b/lib/libc/csu/i386/Makefile.inc @@ -1,4 +1,3 @@ # -CFLAGS+= -DCRT_IRELOC_REL \ - -DINIT_IRELOCS="init_cpu_features()" +CFLAGS+= -DCRT_IRELOC_REL diff --git a/lib/libc/csu/i386/reloc.c b/lib/libc/csu/i386/reloc.c index 1c9ec173facc..7097f58d8f26 100644 --- a/lib/libc/csu/i386/reloc.c +++ b/lib/libc/csu/i386/reloc.c @@ -23,6 +23,8 @@ * SUCH DAMAGE. */ +#include <sys/cdefs.h> + #include <machine/specialreg.h> #include <machine/cpufunc.h> @@ -30,7 +32,7 @@ static uint32_t cpu_feature, cpu_feature2; static uint32_t cpu_stdext_feature, cpu_stdext_feature2; static void -init_cpu_features(void) +ifunc_init(const Elf_Auxinfo *aux __unused) { u_int cpuid_supported, p[4]; diff --git a/lib/libc/csu/libc_start1.c b/lib/libc/csu/libc_start1.c index f0e708e405ce..045ea1e68141 100644 --- a/lib/libc/csu/libc_start1.c +++ b/lib/libc/csu/libc_start1.c @@ -137,6 +137,24 @@ handle_argv(int argc, char *argv[], char **env) } } +static void +handle_irelocs(char *env[]) +{ +#ifndef CRT_IRELOC_SUPPRESS + const Elf_Auxinfo *aux; + + /* Find the auxiliary vector on the stack. */ + while (*env++ != 0) /* Skip over environment, and NULL terminator */ + ; + aux = (const Elf_Auxinfo *)env; + + ifunc_init(aux); + process_irelocs(); +#else + (void)env; +#endif +} + void __libc_start1(int argc, char *argv[], char *env[], void (*cleanup)(void), int (*mainX)(int, char *[], char *[])) @@ -146,10 +164,7 @@ __libc_start1(int argc, char *argv[], char *env[], void (*cleanup)(void), if (&_DYNAMIC != NULL) { atexit(cleanup); } else { -#ifndef CRT_IRELOC_SUPPRESS - INIT_IRELOCS; - process_irelocs(); -#endif + handle_irelocs(env); _init_tls(); } @@ -171,10 +186,7 @@ __libc_start1_gcrt(int argc, char *argv[], char *env[], if (&_DYNAMIC != NULL) { atexit(cleanup); } else { -#ifndef CRT_IRELOC_SUPPRESS - INIT_IRELOCS; - process_irelocs(); -#endif + handle_irelocs(env); _init_tls(); } diff --git a/lib/libc/csu/powerpc/Makefile.inc b/lib/libc/csu/powerpc/Makefile.inc index 2534e6579f38..ddead75f874d 100644 --- a/lib/libc/csu/powerpc/Makefile.inc +++ b/lib/libc/csu/powerpc/Makefile.inc @@ -1,4 +1,3 @@ # -CFLAGS+= -DCRT_IRELOC_SUPPRESS \ - -DINIT_IRELOCS="" +CFLAGS+= -DCRT_IRELOC_SUPPRESS diff --git a/lib/libc/csu/powerpc64/Makefile.inc b/lib/libc/csu/powerpc64/Makefile.inc index 5d59d40eb393..6c315c5e2624 100644 --- a/lib/libc/csu/powerpc64/Makefile.inc +++ b/lib/libc/csu/powerpc64/Makefile.inc @@ -1,4 +1,3 @@ # -CFLAGS+= -DCRT_IRELOC_RELA \ - -DINIT_IRELOCS="init_cpu_features(env)" +CFLAGS+= -DCRT_IRELOC_RELA diff --git a/lib/libc/csu/powerpc64/reloc.c b/lib/libc/csu/powerpc64/reloc.c index 41419bf0e6c2..5637e6534197 100644 --- a/lib/libc/csu/powerpc64/reloc.c +++ b/lib/libc/csu/powerpc64/reloc.c @@ -24,15 +24,8 @@ static uint32_t cpu_features; static uint32_t cpu_features2; static void -init_cpu_features(char **env) +ifunc_init(const Elf_Auxinfo *aux) { - const Elf_Auxinfo *aux; - - /* Find the auxiliary vector on the stack. */ - while (*env++ != 0) /* Skip over environment, and NULL terminator */ - ; - aux = (const Elf_Auxinfo *)env; - /* Digest the auxiliary vector. */ for (; aux->a_type != AT_NULL; aux++) { switch (aux->a_type) { diff --git a/lib/libc/csu/powerpcspe/Makefile.inc b/lib/libc/csu/powerpcspe/Makefile.inc index 2534e6579f38..ddead75f874d 100644 --- a/lib/libc/csu/powerpcspe/Makefile.inc +++ b/lib/libc/csu/powerpcspe/Makefile.inc @@ -1,4 +1,3 @@ # -CFLAGS+= -DCRT_IRELOC_SUPPRESS \ - -DINIT_IRELOCS="" +CFLAGS+= -DCRT_IRELOC_SUPPRESS diff --git a/lib/libc/csu/riscv/Makefile.inc b/lib/libc/csu/riscv/Makefile.inc index 5d59d40eb393..6c315c5e2624 100644 --- a/lib/libc/csu/riscv/Makefile.inc +++ b/lib/libc/csu/riscv/Makefile.inc @@ -1,4 +1,3 @@ # -CFLAGS+= -DCRT_IRELOC_RELA \ - -DINIT_IRELOCS="init_cpu_features(env)" +CFLAGS+= -DCRT_IRELOC_RELA diff --git a/lib/libc/csu/riscv/reloc.c b/lib/libc/csu/riscv/reloc.c index 036ea3de8701..6ae85085089b 100644 --- a/lib/libc/csu/riscv/reloc.c +++ b/lib/libc/csu/riscv/reloc.c @@ -24,15 +24,8 @@ static unsigned long elf_hwcap; static void -init_cpu_features(char **env) +ifunc_init(const Elf_Auxinfo *aux) { - const Elf_Auxinfo *aux; - - /* Find the auxiliary vector on the stack. */ - while (*env++ != 0) /* Skip over environment, and NULL terminator */ - ; - aux = (const Elf_Auxinfo *)env; - /* Digest the auxiliary vector. */ for (; aux->a_type != AT_NULL; aux++) { switch (aux->a_type) {