kernel.git/arch/riscv/kernel/mcount.S, branch linux-6.10.y

riscv: remove MCOUNT_NAME workaround

2024-02-22T23:38:54Z

Now that the minimum supported version of LLVM for building the kernel has been bumped to 13.0.1, the condition for using _mcount as MCOUNT_NAME is always true, as the build will fail during the configuration stage for older LLVM versions. Replace MCOUNT_NAME with _mcount directly. This effectively reverts commit 7ce047715030 ("riscv: Workaround mcount name prior to clang-13"). Link: https://lkml.kernel.org/r/20240125-bump-min-llvm-ver-to-13-0-1-v1-7-f5ff9bda41c5@kernel.org Signed-off-by: Nathan Chancellor Reviewed-by: Kees Cook Cc: Albert Ou Cc: "Aneesh Kumar K.V (IBM)" Cc: Ard Biesheuvel Cc: Borislav Petkov (AMD) Cc: Catalin Marinas Cc: Conor Dooley Cc: Dave Hansen Cc: Ingo Molnar Cc: Mark Rutland Cc: Masahiro Yamada Cc: Michael Ellerman Cc: "Naveen N. Rao" Cc: Nicholas Piggin Cc: Nicolas Schier Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Russell King Cc: Thomas Gleixner Cc: Will Deacon Signed-off-by: Andrew Morton

use linux/export.h rather than asm-generic/export.h

2024-01-10T04:10:40Z

asm-generic/export.h is a wrapper for linux/export.h, with explicit request to use linux/export.h directly. Signed-off-by: Al Viro Link: https://lore.kernel.org/r/20231214191922.GQ1674809@ZenIV Signed-off-by: Palmer Dabbelt

riscv: Use SYM_*() assembly macros instead of deprecated ones

2023-11-06T17:42:47Z

ENTRY()/END()/WEAK() macros are deprecated and we should make use of the new SYM_*() macros [1] for better annotation of symbols. Replace the deprecated ones with the new ones and fix wrong usage of END()/ENDPROC() to correctly describe the symbols. [1] https://docs.kernel.org/core-api/asm-annotations.html Signed-off-by: Clément Léger Reviewed-by: Andrew Jones Link: https://lore.kernel.org/r/20231024132655.730417-3-cleger@rivosinc.com Signed-off-by: Palmer Dabbelt

riscv: use ".L" local labels in assembly when applicable

2023-11-06T17:42:05Z

For the sake of coherency, use local labels in assembly when applicable. This also avoid kprobes being confused when applying a kprobe since the size of function is computed by checking where the next visible symbol is located. This might end up in computing some function size to be way shorter than expected and thus failing to apply kprobes to the specified offset. Signed-off-by: Clément Léger Reviewed-by: Andrew Jones Link: https://lore.kernel.org/r/20231024132655.730417-2-cleger@rivosinc.com Signed-off-by: Palmer Dabbelt

riscv: Add ftrace_stub_graph

2023-08-23T21:16:38Z

Commit 883bbbffa5a4 ("ftrace,kcfi: Separate ftrace_stub() and ftrace_stub_graph()") added a separate ftrace_stub_graph function for CFI_CLANG. Add the stub to fix FUNCTION_GRAPH_TRACER compatibility with CFI. Reviewed-by: Kees Cook Tested-by: Nathan Chancellor Signed-off-by: Sami Tolvanen Link: https://lore.kernel.org/r/20230710183544.999540-11-samitolvanen@google.com Signed-off-by: Palmer Dabbelt

riscv: Add types to indirectly called assembly functions

2023-08-23T21:16:37Z

With CONFIG_CFI_CLANG, assembly functions indirectly called from C code must be annotated with type identifiers to pass CFI checking. Use the SYM_TYPED_START macro to add types to the relevant functions. Reviewed-by: Kees Cook Tested-by: Nathan Chancellor Signed-off-by: Sami Tolvanen Link: https://lore.kernel.org/r/20230710183544.999540-10-samitolvanen@google.com Signed-off-by: Palmer Dabbelt

riscv: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL

2023-06-22T14:39:56Z

The previous patch ("function_graph: Support recording and printing the return value of function") has laid the groundwork for the for the funcgraph-retval, and this modification makes it available on the RISC-V platform. We introduce a new structure called fgraph_ret_regs for the RISC-V platform to hold return registers and the frame pointer. We then fill its content in the return_to_handler and pass its address to the function ftrace_return_to_handler to record the return value. Link: https://lore.kernel.org/linux-trace-kernel/a8d71b12259f90e7e63d0ea654fcac95b0232bbc.1680954589.git.pengdonglin@sangfor.com.cn Signed-off-by: Donglin Peng Acked-by: Palmer Dabbelt Signed-off-by: Steven Rostedt (Google)

RISC-V: preserve a1 in mcount

2022-12-02T18:04:37Z

The RISC-V ELF psABI states that both a0 and a1 are used for return values so we should preserve them both in return_to_handler. This is especially important for RV32 for functions returning a 64-bit quantity otherwise the return value can be corrupted and undefined behaviour results. Reviewed-by: Andrew Jones Signed-off-by: Jamie Iles Link: https://lore.kernel.org/r/20221115200832.706370-4-jamie@jamieiles.com Signed-off-by: Palmer Dabbelt

RISC-V: reduce mcount save space on RV32

2022-12-02T18:04:36Z

For RV32 we can reduce the size of the ABI save+restore state by using SZREG so that register stores are packed rather than on an 8 byte boundary. Signed-off-by: Jamie Iles Reviewed-by: Andrew Jones Link: https://lore.kernel.org/r/20221115200832.706370-3-jamie@jamieiles.com Signed-off-by: Palmer Dabbelt

RISC-V: use REG_S/REG_L for mcount

2022-12-02T18:04:35Z

In preparation for rv32i ftrace support, convert mcount routines to use native sized loads/stores. Reviewed-by: Andrew Jones Signed-off-by: Jamie Iles Link: https://lore.kernel.org/r/20221115200832.706370-2-jamie@jamieiles.com Signed-off-by: Palmer Dabbelt