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lib: sbi: Introduce sbi_trap_exit() API

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We introduce sbi_trap_exit() API which can help non-firmware
(i.e. generic or platform) code to force exit trap/interrupt
handling and resume execution at context pointed by parameter
"const struct sbi_trap_regs *regs".

This new sbi_trap_exit() API will help Keystone Enclave project
to resume execution of enclave from custom SBI call handler.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-12-29 11:39:22 +05:30
committed by Anup Patel
parent 80bc5065bb
commit b7df5e4392
4 changed files with 72 additions and 3 deletions
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20
lib/sbi/sbi_trap.c
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@@ -16,6 +16,7 @@
#include <sbi/sbi_illegal_insn.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_misaligned_ldst.h>
#include <sbi/sbi_scratch.h>
#include <sbi/sbi_timer.h>
#include <sbi/sbi_trap.h>
@@ -271,3 +272,22 @@ trap_error:
if (rc)
sbi_trap_error(msg, rc, mcause, mtval, mtval2, mtinst, regs);
}
typedef void (*trap_exit_t)(const struct sbi_trap_regs *regs);
/**
* Exit trap/interrupt handling
*
* This function is called by non-firmware code to abruptly exit
* trap/interrupt handling and resume execution at context pointed
* by given register state.
*
* @param regs pointer to register state
*/
void __noreturn sbi_trap_exit(const struct sbi_trap_regs *regs)
{
struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
((trap_exit_t)scratch->trap_exit)(regs);
__builtin_unreachable();
}