linux-kernel - [PATCH 11/31] gpu: nova-core: add support for 32-bit firmware images

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Message-ID: <20251203055923.1247681-12-jhubbard@nvidia.com>
Date: Tue,  2 Dec 2025 21:59:03 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Alexandre Courbot <acourbot@...dia.com>,
	Joel Fernandes <joelagnelf@...dia.com>,
	Timur Tabi <ttabi@...dia.com>,
	Alistair Popple <apopple@...dia.com>,
	Edwin Peer <epeer@...dia.com>,
	Zhi Wang <zhiw@...dia.com>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	nouveau@...ts.freedesktop.org,
	rust-for-linux@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	John Hubbard <jhubbard@...dia.com>
Subject: [PATCH 11/31] gpu: nova-core: add support for 32-bit firmware images

Add Elf32Hdr and Elf32SHdr newtypes, implement the ElfHeader and
ElfSectionHeader traits for them, and add elf32_section().

This mirrors the existing ELF64 support, using the same generic
infrastructure.

Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 drivers/gpu/nova-core/firmware.rs | 46 +++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/gpu/nova-core/firmware.rs b/drivers/gpu/nova-core/firmware.rs
index 1cb5897778f8..c355e0d7e407 100644
--- a/drivers/gpu/nova-core/firmware.rs
+++ b/drivers/gpu/nova-core/firmware.rs
@@ -310,6 +310,46 @@ fn size(&self) -> u64 {
         }
     }
 
+    /// Newtype to provide [`FromBytes`] and [`ElfHeader`] implementations for ELF32.
+    #[repr(transparent)]
+    struct Elf32Hdr(bindings::elf32_hdr);
+    // SAFETY: all bit patterns are valid for this type, and it doesn't use interior mutability.
+    unsafe impl FromBytes for Elf32Hdr {}
+
+    impl ElfHeader for Elf32Hdr {
+        fn shnum(&self) -> u16 {
+            self.0.e_shnum
+        }
+
+        fn shoff(&self) -> u64 {
+            u64::from(self.0.e_shoff)
+        }
+
+        fn shstrndx(&self) -> u16 {
+            self.0.e_shstrndx
+        }
+    }
+
+    /// Newtype to provide [`FromBytes`] and [`ElfSectionHeader`] implementations for ELF32.
+    #[repr(transparent)]
+    struct Elf32SHdr(bindings::elf32_shdr);
+    // SAFETY: all bit patterns are valid for this type, and it doesn't use interior mutability.
+    unsafe impl FromBytes for Elf32SHdr {}
+
+    impl ElfSectionHeader for Elf32SHdr {
+        fn name(&self) -> u32 {
+            self.0.sh_name
+        }
+
+        fn offset(&self) -> u64 {
+            u64::from(self.0.sh_offset)
+        }
+
+        fn size(&self) -> u64 {
+            u64::from(self.0.sh_size)
+        }
+    }
+
     /// Check if the section name at `strtab_offset + name_offset` equals `target`.
     fn section_name_eq(elf: &[u8], strtab_offset: u64, name_offset: u32, target: &str) -> bool {
         strtab_offset
@@ -371,4 +411,10 @@ fn elf_section_generic<'a, H, S>(elf: &'a [u8], name: &str) -> Option<&'a [u8]>
     pub(super) fn elf64_section<'a>(elf: &'a [u8], name: &str) -> Option<&'a [u8]> {
         elf_section_generic::<Elf64Hdr, Elf64SHdr>(elf, name)
     }
+
+    /// Extract section with name `name` from the ELF32 image `elf`.
+    #[expect(dead_code)]
+    pub(super) fn elf32_section<'a>(elf: &'a [u8], name: &str) -> Option<&'a [u8]> {
+        elf_section_generic::<Elf32Hdr, Elf32SHdr>(elf, name)
+    }
 }
-- 
2.52.0