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target/loongarch: Add dynamic function access with CSR register

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With CSR register, dynamic function access is used for CSR register
access in TCG mode, so that csr info can be used by other modules.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
This commit is contained in:
Bibo Mao 2025-01-13 11:28:18 +08:00
parent cf86770c7a
commit 90f73c2d7f
3 changed files with 51 additions and 3 deletions
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37
target/loongarch/tcg/insn_trans/trans_privileged.c.inc
View file

@ -76,7 +76,7 @@ enum {
#define CSR_OFF(NAME) \
CSR_OFF_FLAGS(NAME, 0)
static const CSRInfo csr_info[] = {
static CSRInfo csr_info[] = {
CSR_OFF_FLAGS(CRMD, CSRFL_EXITTB),
CSR_OFF(PRMD),
CSR_OFF_FLAGS(EUEN, CSRFL_EXITTB),
@ -160,9 +160,9 @@ static bool check_plv(DisasContext *ctx)
return false;
}
static const CSRInfo *get_csr(unsigned csr_num)
static CSRInfo *get_csr(unsigned csr_num)
{
const CSRInfo *csr;
CSRInfo *csr;
if (csr_num >= ARRAY_SIZE(csr_info)) {
return NULL;
@ -174,6 +174,37 @@ static const CSRInfo *get_csr(unsigned csr_num)
return csr;
}
static bool set_csr_trans_func(unsigned int csr_num, GenCSRRead readfn,
GenCSRWrite writefn)
{
CSRInfo *csr;
csr = get_csr(csr_num);
if (!csr) {
return false;
}
csr->readfn = readfn;
csr->writefn = writefn;
return true;
}
#define SET_CSR_FUNC(NAME, read, write) \
set_csr_trans_func(LOONGARCH_CSR_##NAME, read, write)
void loongarch_csr_translate_init(void)
{
SET_CSR_FUNC(ESTAT, NULL, gen_helper_csrwr_estat);
SET_CSR_FUNC(ASID, NULL, gen_helper_csrwr_asid);
SET_CSR_FUNC(PGD, gen_helper_csrrd_pgd, NULL);
SET_CSR_FUNC(PWCL, NULL, gen_helper_csrwr_pwcl);
SET_CSR_FUNC(CPUID, gen_helper_csrrd_cpuid, NULL);
SET_CSR_FUNC(TCFG, NULL, gen_helper_csrwr_tcfg);
SET_CSR_FUNC(TVAL, gen_helper_csrrd_tval, NULL);
SET_CSR_FUNC(TICLR, NULL, gen_helper_csrwr_ticlr);
}
#undef SET_CSR_FUNC
static bool check_csr_flags(DisasContext *ctx, const CSRInfo *csr, bool write)
{
if ((csr->flags & CSRFL_READONLY) && write) {

12
target/loongarch/tcg/tcg_loongarch.h Normal file
View file

@ -0,0 +1,12 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* QEMU LoongArch TCG interface
*
* Copyright (c) 2025 Loongson Technology Corporation Limited
*/
#ifndef TARGET_LOONGARCH_TCG_LOONGARCH_H
#define TARGET_LOONGARCH_TCG_LOONGARCH_H
void loongarch_csr_translate_init(void);
#endif /* TARGET_LOONGARCH_TCG_LOONGARCH_H */

5
target/loongarch/tcg/translate.c
View file

@ -16,6 +16,7 @@
#include "exec/log.h"
#include "qemu/qemu-print.h"
#include "fpu/softfloat.h"
#include "tcg_loongarch.h"
#include "translate.h"
#include "internals.h"
#include "vec.h"
@ -358,4 +359,8 @@ void loongarch_translate_init(void)
offsetof(CPULoongArchState, lladdr), "lladdr");
cpu_llval = tcg_global_mem_new(tcg_env,
offsetof(CPULoongArchState, llval), "llval");
#ifndef CONFIG_USER_ONLY
loongarch_csr_translate_init();
#endif
}