| commit | 486f15b64f9b1212b4de7bff95d273e708bad84c | [log] [tgz] |
|---|---|---|
| author | Joshua Seaton <joshuaseaton@fuchsia.infra.roller.google.com> | Sat Dec 14 19:50:42 2024 -0800 |
| committer | Copybara-Service <copybara-worker@google.com> | Sat Dec 14 19:52:18 2024 -0800 |
| tree | 4d345372eefbed931efa2b7d58ea611f44a2cf5b | |
| parent | 407089cb0e41dedb82320bb706c1e328b0a0895b [diff] |
[roll] Roll fuchsia [kernel][x86] Make start16.S PIE-friendly This change updates the start16.S to avoid some address constants which will not be allowed when we start linking zircon as PIE. There were two instances that were updated: * One spot in the section intended only to be run in the kernel's linked-in copy at its high virtual address: given where it runs `movabs $x86_secondary_entry, %rbx` can be replaced by `lea x86_secondary_entry(%rip), %rbx`; * Another spot intended to be run in a copied version of the code involves jumping to the linked-in, high entrypoint. Here pc-relative addressing is naturally not available to reference this, so we instead store the high virtual address of this entrypoint in the data structure provided to this code and load it out of there. Original-Bug: 42164859 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1171484 Original-Revision: 2ec3af5fd1e5ac8a422ff6cf93ec6e441a6efeb8 GitOrigin-RevId: c1dafb0fcee653eff6a4e3bd8556c65fc63e4336 Change-Id: Ib2fc169c756a0f2cf1cb1cb301aee13c02859176
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