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lib: sbi: Remove sbi_trap_exit() and related code

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Over the years, no uses of sbi_trap_exit() have been found so remove
it and also remove related code from fw_base.S and sbi_scratch.h.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Tested-by: Samuel Holland <samuel.holland@sifive.com>
This commit is contained in:
Anup Patel
2024-03-11 11:04:50 +05:30
committed by Anup Patel
parent 2e8517865a
commit ebb697ad8c
4 changed files with 3 additions and 44 deletions
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11
firmware/fw_base.S
View File

@@ -298,9 +298,6 @@ _scratch_init:
/* Store hartid-to-scratch function address in scratch space */
lla a4, _hartid_to_scratch
REG_S a4, SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET(tp)
/* Store trap-exit function address in scratch space */
lla a4, _trap_exit
REG_S a4, SBI_SCRATCH_TRAP_EXIT_OFFSET(tp)
/* Clear tmp0 in scratch space */
REG_S zero, SBI_SCRATCH_TMP0_OFFSET(tp)
/* Store firmware options in scratch space */
@@ -453,10 +450,6 @@ _start_warm:
srli a5, a5, ('H' - 'A')
andi a5, a5, 0x1
beq a5, zero, _skip_trap_handler_rv32_hyp
/* Override trap exit for H-extension */
csrr a5, CSR_MSCRATCH
lla a4, _trap_exit_rv32_hyp
REG_S a4, SBI_SCRATCH_TRAP_EXIT_OFFSET(a5)
lla a4, _trap_handler_rv32_hyp
_skip_trap_handler_rv32_hyp:
#endif
@@ -695,7 +688,6 @@ memcmp:
.section .entry, "ax", %progbits
.align 3
.globl _trap_handler
.globl _trap_exit
_trap_handler:
TRAP_SAVE_AND_SETUP_SP_T0
@@ -705,7 +697,6 @@ _trap_handler:
TRAP_CALL_C_ROUTINE
_trap_exit:
TRAP_RESTORE_GENERAL_REGS_EXCEPT_A0_T0
TRAP_RESTORE_MEPC_MSTATUS 0
@@ -718,7 +709,6 @@ _trap_exit:
.section .entry, "ax", %progbits
.align 3
.globl _trap_handler_rv32_hyp
.globl _trap_exit_rv32_hyp
_trap_handler_rv32_hyp:
TRAP_SAVE_AND_SETUP_SP_T0
@@ -728,7 +718,6 @@ _trap_handler_rv32_hyp:
TRAP_CALL_C_ROUTINE
_trap_exit_rv32_hyp:
TRAP_RESTORE_GENERAL_REGS_EXCEPT_A0_T0
TRAP_RESTORE_MEPC_MSTATUS 1

15
include/sbi/sbi_scratch.h
View File

@@ -36,14 +36,12 @@
#define SBI_SCRATCH_PLATFORM_ADDR_OFFSET (9 * __SIZEOF_POINTER__)
/** Offset of hartid_to_scratch member in sbi_scratch */
#define SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET (10 * __SIZEOF_POINTER__)
/** Offset of trap_exit member in sbi_scratch */
#define SBI_SCRATCH_TRAP_EXIT_OFFSET (11 * __SIZEOF_POINTER__)
/** Offset of tmp0 member in sbi_scratch */
#define SBI_SCRATCH_TMP0_OFFSET (12 * __SIZEOF_POINTER__)
#define SBI_SCRATCH_TMP0_OFFSET (11 * __SIZEOF_POINTER__)
/** Offset of options member in sbi_scratch */
#define SBI_SCRATCH_OPTIONS_OFFSET (13 * __SIZEOF_POINTER__)
#define SBI_SCRATCH_OPTIONS_OFFSET (12 * __SIZEOF_POINTER__)
/** Offset of extra space in sbi_scratch */
#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (14 * __SIZEOF_POINTER__)
#define SBI_SCRATCH_EXTRA_SPACE_OFFSET (13 * __SIZEOF_POINTER__)
/** Maximum size of sbi_scratch (4KB) */
#define SBI_SCRATCH_SIZE (0x1000)
@@ -77,8 +75,6 @@ struct sbi_scratch {
unsigned long platform_addr;
/** Address of HART ID to sbi_scratch conversion function */
unsigned long hartid_to_scratch;
/** Address of trap exit function */
unsigned long trap_exit;
/** Temporary storage */
unsigned long tmp0;
/** Options for OpenSBI library */
@@ -129,11 +125,6 @@ _Static_assert(
== SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET,
"struct sbi_scratch definition has changed, please redefine "
"SBI_SCRATCH_HARTID_TO_SCRATCH_OFFSET");
_Static_assert(
offsetof(struct sbi_scratch, trap_exit)
== SBI_SCRATCH_TRAP_EXIT_OFFSET,
"struct sbi_scratch definition has changed, please redefine "
"SBI_SCRATCH_TRAP_EXIT_OFFSET");
_Static_assert(
offsetof(struct sbi_scratch, tmp0)
== SBI_SCRATCH_TMP0_OFFSET,

2
include/sbi/sbi_trap.h
View File

@@ -225,8 +225,6 @@ int sbi_trap_redirect(struct sbi_trap_regs *regs,
struct sbi_trap_regs *sbi_trap_handler(struct sbi_trap_regs *regs);
void __noreturn sbi_trap_exit(const struct sbi_trap_regs *regs);
#endif
#endif

19
lib/sbi/sbi_trap.c
View File

@@ -334,22 +334,3 @@ trap_error:
sbi_trap_error(msg, rc, mcause, mtval, mtval2, mtinst, regs);
return 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();
}