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lib: Initialize out value in SBI calls

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As per the SBI specification, the return value in sbiret is undefined
if not explicitly described in the function. However, supervisor may
check this value by mistake and get a garbage value.

Initialize it to zero to avoid nasty supervisor bugs.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2020-02-11 17:39:45 -08:00
committed by Anup Patel
parent 897b8fbdd9
commit 1a8ca08cc0
1 changed files with 1 additions and 1 deletions
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lib/sbi/sbi_ecall.c
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@@ -79,7 +79,7 @@ int sbi_ecall_handler(u32 hartid, ulong mcause, struct sbi_trap_regs *regs,
unsigned long extension_id = regs->a7;
unsigned long func_id = regs->a6;
struct sbi_trap_info trap = {0};
unsigned long out_val;
unsigned long out_val = 0;
bool is_0_1_spec = 0;
unsigned long args[6];