[PATCH] riscv: fix misaligned access handling of C.SWSP and C.SDSP

[PATCH] riscv: fix misaligned access handling of C.SWSP and C.SDSP

[Clément Léger]

This is a backport of a fix that was done in OpenSBI: ec0559eb315b
("lib: sbi_misaligned_ldst: Fix handling of C.SWSP and C.SDSP").

Unlike C.LWSP/C.LDSP, these encodings can be used with the zero
register, so checking that the rs2 field is non-zero is unnecessary.

Additionally, the previous check was incorrect since it was checking
the immediate field of the instruction instead of the rs2 field.

Fixes: 956d705dd279 ("riscv: Unaligned load/store handling for M_MODE")
Signed-off-by: Clément Léger <cleger@rivosinc.com>
---
 arch/riscv/kernel/traps_misaligned.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/kernel/traps_misaligned.c b/arch/riscv/kernel/traps_misaligned.c
index 378f5b151443..5348d842c745 100644
--- a/arch/riscv/kernel/traps_misaligned.c
+++ b/arch/riscv/kernel/traps_misaligned.c
@@ -342,16 +342,14 @@ int handle_misaligned_store(struct pt_regs *regs)
 	} else if ((insn & INSN_MASK_C_SD) == INSN_MATCH_C_SD) {
 		len = 8;
 		val.data_ulong = GET_RS2S(insn, regs);
-	} else if ((insn & INSN_MASK_C_SDSP) == INSN_MATCH_C_SDSP &&
-		   ((insn >> SH_RD) & 0x1f)) {
+	} else if ((insn & INSN_MASK_C_SDSP) == INSN_MATCH_C_SDSP) {
 		len = 8;
 		val.data_ulong = GET_RS2C(insn, regs);
 #endif
 	} else if ((insn & INSN_MASK_C_SW) == INSN_MATCH_C_SW) {
 		len = 4;
 		val.data_ulong = GET_RS2S(insn, regs);
-	} else if ((insn & INSN_MASK_C_SWSP) == INSN_MATCH_C_SWSP &&
-		   ((insn >> SH_RD) & 0x1f)) {
+	} else if ((insn & INSN_MASK_C_SWSP) == INSN_MATCH_C_SWSP) {
 		len = 4;
 		val.data_ulong = GET_RS2C(insn, regs);
 	} else {
-- 
2.42.0


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Re: [PATCH] riscv: fix misaligned access handling of C.SWSP and C.SDSP

[patchwork-bot+linux-riscv]

Hello:

This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <palmer@rivosinc.com>:

On Fri,  3 Nov 2023 10:02:23 +0100 you wrote:
> This is a backport of a fix that was done in OpenSBI: ec0559eb315b
> ("lib: sbi_misaligned_ldst: Fix handling of C.SWSP and C.SDSP").
> 
> Unlike C.LWSP/C.LDSP, these encodings can be used with the zero
> register, so checking that the rs2 field is non-zero is unnecessary.
> 
> Additionally, the previous check was incorrect since it was checking
> the immediate field of the instruction instead of the rs2 field.
> 
> [...]

Here is the summary with links:
  - riscv: fix misaligned access handling of C.SWSP and C.SDSP
    https://git.kernel.org/riscv/c/22e0eb04837a

You are awesome, thank you!
-- 
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