Jamie Iles
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e958eb5cf3
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RISC-V: preserve a1 in mcount
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 <ajones@ventanamicro.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Link: https://lore.kernel.org/r/20221115200832.706370-4-jamie@jamieiles.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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2026-08-09 22:38:51 -07:00 |
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Jamie Iles
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b2371299bf
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RISC-V: reduce mcount save space on RV32
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 <jamie@jamieiles.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20221115200832.706370-3-jamie@jamieiles.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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2026-08-09 22:38:51 -07:00 |
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Jamie Iles
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0f11a52582
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RISC-V: use REG_S/REG_L for mcount
In preparation for rv32i ftrace support, convert mcount routines to use
native sized loads/stores.
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Link: https://lore.kernel.org/r/20221115200832.706370-2-jamie@jamieiles.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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2026-08-09 22:38:51 -07:00 |
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9d0aeafebd
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initial commit
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2026-08-09 22:38:33 -07:00 |
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