Date: Fri, 8 Oct 2021 06:11:12 GMT From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 438448dd9fb5 - stable/12 - Use adrp in the arm64 efi loader Message-ID: <202110080611.1986BCbD007745@gitrepo.freebsd.org>
next in thread | raw e-mail | index | archive | help
The branch stable/12 has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=438448dd9fb50720cc289b63892c12b6c8c34e5f commit 438448dd9fb50720cc289b63892c12b6c8c34e5f Author: Andrew Turner <andrew@FreeBSD.org> AuthorDate: 2020-10-13 16:51:05 +0000 Commit: Kyle Evans <kevans@FreeBSD.org> CommitDate: 2021-10-08 05:24:27 +0000 Use adrp in the arm64 efi loader On startup the arm64 efi loaders need to know PC-relative addresses. Previously we used the adr instruction to find this address, however this instruction is limited to +/- 1MiB. Switch to adrp to find the 4k page the address is within and an add to set the bottom 12 bits. This lets us address +/- 4GiB which should be large enough for now. (cherry picked from commit b9aa4537b2155a0b0bb419ff05b8da206c02bfbd) --- stand/efi/loader/arch/arm64/start.S | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/stand/efi/loader/arch/arm64/start.S b/stand/efi/loader/arch/arm64/start.S index bddc2d088a64..675d4e153f36 100644 --- a/stand/efi/loader/arch/arm64/start.S +++ b/stand/efi/loader/arch/arm64/start.S @@ -142,8 +142,10 @@ _start: /* Save the boot params to the stack */ stp x0, x1, [sp, #-16]! - adr x0, __bss_start - adr x1, __bss_end + adrp x0, __bss_start + add x0, x0, :lo12:__bss_start + adrp x1, __bss_end + add x1, x1, :lo12:__bss_end b 2f @@ -153,8 +155,10 @@ _start: cmp x0, x1 b.lo 1b - adr x0, ImageBase - adr x1, _DYNAMIC + adrp x0, ImageBase + add x0, x0, :lo12:ImageBase + adrp x1, _DYNAMIC + add x1, x1, :lo12:_DYNAMIC bl self_reloc @@ -165,7 +169,8 @@ _start: * Load the stack to use. The default stack may be too small for * the lua loader. */ - adr x2, initstack_end + adrp x2, initstack_end + add x2, x2, :lo12:initstack_end mov sp, x2 #endif
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202110080611.1986BCbD007745>