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lib: sbi_trap_v_ldst: Redirect unhandled traps

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When SBI is built with a compiler that doesn't support vector, the
misaligned vector load/store emulation is not built in, the handlers are
just stubs.

Currently the stubs just return 0, causing sbi_trap_emulate_load() to
return without incrementing mepc, meaning the instruction will just
fault again, an infinite loop.

Fix the stubs to use sbi_trap_redirect(), which forwards the trap to the
previous mode, allowing it to be handled there.

Fixes: c2acc5e5 ("lib: sbi_misaligned_ldst: Add handling of vector load/store")
Signed-off-by: Michael Ellerman <mpe@kernel.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260530-trap-redirect-v1-1-45d4d333d8c9@kernel.org
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Michael Ellerman
2026-05-30 00:42:18 +10:00
committed by Anup Patel
parent dec9141a77
commit 1157eb37e2
1 changed files with 4 additions and 2 deletions
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lib/sbi/sbi_trap_v_ldst.c
+4 -2
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@@ -334,11 +334,13 @@ int sbi_misaligned_v_st_emulator(int wlen, union sbi_ldst_data in_val,
int sbi_misaligned_v_ld_emulator(int rlen, union sbi_ldst_data *out_val,
struct sbi_trap_context *tcntx)
{
return 0;
/* Unable to emulate, send trap to previous mode. */
return sbi_trap_redirect(&tcntx->regs, &tcntx->trap);
}
int sbi_misaligned_v_st_emulator(int wlen, union sbi_ldst_data in_val,
struct sbi_trap_context *tcntx)
{
return 0;
/* Unable to emulate, send trap to previous mode. */
return sbi_trap_redirect(&tcntx->regs, &tcntx->trap);
}
#endif /* OPENSBI_CC_SUPPORT_VECTOR */