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| author | Dmitry Chagin <dchagin@FreeBSD.org> | 2023-07-07 16:55:08 +0000 |
|---|---|---|
| committer | Dmitry Chagin <dchagin@FreeBSD.org> | 2023-07-07 16:55:08 +0000 |
| commit | 5645dfb41ae0d5ca0acdee8a2a6646787b33e03f (patch) | |
| tree | 981a20e4a6ce449380cf398e416f23d66042b37f | |
| parent | 43e29d03f416d7dda52112a29600a7c82ee1a91e (diff) | |
| download | src-5645dfb41ae0d5ca0acdee8a2a6646787b33e03f.tar.gz src-5645dfb41ae0d5ca0acdee8a2a6646787b33e03f.zip | |
rtld: Sligtly optimizing .rtld_start on aarch64
Use the LDP (load pair registers) instruction to load entry point
arguments from the stack.
Reviewed by:
Differential Revision: https://reviews.freebsd.org/D40843
| -rw-r--r-- | libexec/rtld-elf/aarch64/rtld_start.S | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/libexec/rtld-elf/aarch64/rtld_start.S b/libexec/rtld-elf/aarch64/rtld_start.S index 196559d9d2bc..4f0bef0233b0 100644 --- a/libexec/rtld-elf/aarch64/rtld_start.S +++ b/libexec/rtld-elf/aarch64/rtld_start.S @@ -32,7 +32,6 @@ __FBSDID("$FreeBSD$"); ENTRY(.rtld_start) mov x19, x0 /* Put ps_strings in a callee-saved register */ - mov x20, sp /* And the stack pointer */ sub sp, sp, #16 /* Make room for obj_main & exit proc */ @@ -40,11 +39,9 @@ ENTRY(.rtld_start) add x2, x1, #8 /* obj_main */ bl _rtld /* Call the loader */ mov x8, x0 /* Backup the entry point */ + ldp x2, x1, [sp], #16 /* Load cleanup, obj_main */ - ldr x2, [sp] /* Load cleanup */ - ldr x1, [sp, #8] /* Load obj_main */ mov x0, x19 /* Restore ps_strings */ - mov sp, x20 /* Restore the stack pointer */ br x8 /* Jump to the entry point */ END(.rtld_start) |