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lib: sbi: Replace args with trap registers in ecall handler

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We had added args pointer in ecall handler to ensure that ecall
handler only implements functionality and does not deal with
SBI calling convention. This also helped us to keep SBI calling
convention related code in one place at sbi_ecall_handler().

The Keystone Enclavce project needs access to the trap regsiters
in their ecall handler so that they can context switch enclaves
in custom SBI calls. To help the Keystone Enclave project, we
replace the args pointer in ecall handler parameter with a const
pointer to trap registers.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-12-28 18:25:18 +05:30
committed by Anup Patel
parent 7dcb1e1753
commit 80bc5065bb
9 changed files with 76 additions and 69 deletions
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6
lib/sbi/sbi_ecall_base.c
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@@ -11,6 +11,7 @@
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_trap.h>
#include <sbi/sbi_version.h>
#include <sbi/riscv_asm.h>
@@ -32,7 +33,8 @@ static int sbi_ecall_base_probe(unsigned long extid, unsigned long *out_val)
}
static int sbi_ecall_base_handler(unsigned long extid, unsigned long funcid,
unsigned long *args, unsigned long *out_val,
const struct sbi_trap_regs *regs,
unsigned long *out_val,
struct sbi_trap_info *out_trap)
{
int ret = 0;
@@ -61,7 +63,7 @@ static int sbi_ecall_base_handler(unsigned long extid, unsigned long funcid,
*out_val = csr_read(CSR_MIMPID);
break;
case SBI_EXT_BASE_PROBE_EXT:
ret = sbi_ecall_base_probe(args[0], out_val);
ret = sbi_ecall_base_probe(regs->a0, out_val);
break;
default:
ret = SBI_ENOTSUPP;