riscv: Move global pointer loading to a macro

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In Clang 17, -fsanitize=shadow-call-stack uses the newly declared
platform register gp for storing shadow call stack pointers. As
this is obviously incompatible with gp relaxation, in preparation
for CONFIG_SHADOW_CALL_STACK support, move global pointer loading
to a single macro, which we can cleanly disable when SCS is used
instead.

Link: https://reviews.llvm.org/rGaa1d2693c256
Link: a484e843e6
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20230927224757.1154247-11-samitolvanen@google.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Sami Tolvanen 2023-09-27 22:48:01 +00:00 • committed by Palmer Dabbelt

parent 82982fdd51

commit e609b4f425

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4 changed files with 14 additions and 20 deletions

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8

arch/riscv/include/asm/asm.h

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arch/riscv/kernel/entry.S

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15

arch/riscv/kernel/head.S

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5

arch/riscv/kernel/suspend_entry.S

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