mirror of
https://github.com/AsahiLinux/m1n1
synced 2024-11-23 07:03:08 +00:00
hv: Store exception info regs on entry, and use it
This is the second part of allowing nested exceptions Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
parent
607464f8b0
commit
25bc815821
4 changed files with 75 additions and 72 deletions
8
src/hv.c
8
src/hv.c
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@ -301,11 +301,11 @@ void hv_rearm(void)
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msr(CNTP_CTL_EL0, CNTx_CTL_ENABLE);
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}
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void hv_check_rendezvous(u64 *regs)
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void hv_check_rendezvous(struct exc_info *ctx)
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{
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if (hv_want_cpu == smp_id()) {
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hv_want_cpu = -1;
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hv_exc_proxy(regs, START_HV, HV_USER_INTERRUPT, NULL);
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hv_exc_proxy(ctx, START_HV, HV_USER_INTERRUPT, NULL);
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} else if (hv_want_cpu != -1) {
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// Unlock the HV so the target CPU can get into the proxy
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spin_unlock(&bhl);
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@ -317,7 +317,7 @@ void hv_check_rendezvous(u64 *regs)
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}
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}
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void hv_tick(u64 *regs)
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void hv_tick(struct exc_info *ctx)
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{
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if (hv_should_exit) {
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spin_unlock(&bhl);
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@ -326,7 +326,7 @@ void hv_tick(u64 *regs)
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hv_wdt_pet();
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iodev_handle_events(uartproxy_iodev);
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if (iodev_can_read(uartproxy_iodev)) {
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hv_exc_proxy(regs, START_HV, HV_USER_INTERRUPT, NULL);
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hv_exc_proxy(ctx, START_HV, HV_USER_INTERRUPT, NULL);
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}
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hv_vuart_poll();
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}
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9
src/hv.h
9
src/hv.h
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@ -3,6 +3,7 @@
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#ifndef HV_H
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#define HV_H
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#include "exception.h"
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#include "iodev.h"
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#include "types.h"
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#include "uartproxy.h"
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@ -51,7 +52,7 @@ int hv_map_sw(u64 from, u64 to, u64 size);
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int hv_map_hook(u64 from, hv_hook_t *hook, u64 size);
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u64 hv_translate(u64 addr, bool s1only, bool w);
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u64 hv_pt_walk(u64 addr);
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bool hv_handle_dabort(u64 *regs);
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bool hv_handle_dabort(struct exc_info *ctx);
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bool hv_pa_write(u64 addr, u64 *val, int width);
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bool hv_pa_read(u64 addr, u64 *val, int width);
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bool hv_pa_rw(u64 addr, u64 *val, bool write, int width);
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@ -64,7 +65,7 @@ void hv_vuart_poll(void);
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void hv_map_vuart(u64 base, int irq, iodev_id_t iodev);
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/* Exceptions */
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void hv_exc_proxy(u64 *regs, uartproxy_boot_reason_t reason, uartproxy_exc_code_t type,
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void hv_exc_proxy(struct exc_info *ctx, uartproxy_boot_reason_t reason, uartproxy_exc_code_t type,
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void *extra);
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/* WDT */
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@ -94,7 +95,7 @@ void hv_rendezvous(void);
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void hv_switch_cpu(int cpu);
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void hv_arm_tick(void);
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void hv_rearm(void);
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void hv_check_rendezvous(u64 *regs);
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void hv_tick(u64 *regs);
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void hv_check_rendezvous(struct exc_info *ctx);
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void hv_tick(struct exc_info *ctx);
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#endif
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110
src/hv_exc.c
110
src/hv_exc.c
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@ -36,9 +36,10 @@ static u64 exc_entry_time;
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extern u32 hv_cpus_in_guest;
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void hv_exc_proxy(u64 *regs, uartproxy_boot_reason_t reason, uartproxy_exc_code_t type, void *extra)
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void hv_exc_proxy(struct exc_info *ctx, uartproxy_boot_reason_t reason, uartproxy_exc_code_t type,
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void *extra)
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{
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int from_el = FIELD_GET(SPSR_M, hv_get_spsr()) >> 2;
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int from_el = FIELD_GET(SPSR_M, ctx->spsr) >> 2;
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hv_wdt_breadcrumb('P');
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@ -49,26 +50,15 @@ void hv_exc_proxy(u64 *regs, uartproxy_boot_reason_t reason, uartproxy_exc_code_
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u64 entry_time = mrs(CNTPCT_EL0);
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#endif
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struct exc_info exc_info = {
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.cpu_id = smp_id(),
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.spsr = hv_get_spsr(),
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.elr = hv_get_elr(),
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.esr = hv_get_esr(),
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.far = hv_get_far(),
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.afsr1 = hv_get_afsr1(),
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.sp = {mrs(SP_EL0), mrs(SP_EL1), 0},
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.mpidr = mrs(MPIDR_EL1),
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.elr_phys = hv_translate(hv_get_elr(), false, false),
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.far_phys = hv_translate(hv_get_far(), false, false),
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.sp_phys = hv_translate(from_el == 0 ? mrs(SP_EL0) : mrs(SP_EL1), false, false),
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.extra = extra,
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};
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memcpy(exc_info.regs, regs, sizeof(exc_info.regs));
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ctx->elr_phys = hv_translate(ctx->elr, false, false);
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ctx->far_phys = hv_translate(ctx->far, false, false);
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ctx->sp_phys = hv_translate(from_el == 0 ? ctx->sp[0] : ctx->sp[1], false, false);
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ctx->extra = extra;
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struct uartproxy_msg_start start = {
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.reason = reason,
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.code = type,
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.info = &exc_info,
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.info = ctx,
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};
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hv_wdt_suspend();
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@ -77,11 +67,6 @@ void hv_exc_proxy(u64 *regs, uartproxy_boot_reason_t reason, uartproxy_exc_code_
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switch (ret) {
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case EXC_RET_HANDLED:
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memcpy(regs, exc_info.regs, sizeof(exc_info.regs));
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hv_set_spsr(exc_info.spsr);
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hv_set_elr(exc_info.elr);
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msr(SP_EL0, exc_info.sp[0]);
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msr(SP_EL1, exc_info.sp[1]);
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hv_wdt_breadcrumb('p');
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#ifdef TIME_ACCOUNTING
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u64 lost = mrs(CNTPCT_EL0) - entry_time;
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@ -93,7 +78,7 @@ void hv_exc_proxy(u64 *regs, uartproxy_boot_reason_t reason, uartproxy_exc_code_
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hv_exit_guest();
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default:
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printf("Guest exception not handled, rebooting.\n");
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print_regs(regs, 0);
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print_regs(ctx->regs, 0);
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flush_and_reboot();
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}
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}
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@ -144,13 +129,15 @@ static void hv_update_fiq(void)
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_msr(sr_tkn(sr), regs[rt]); \
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return true;
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static bool hv_handle_msr(u64 *regs, u64 iss)
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static bool hv_handle_msr(struct exc_info *ctx, u64 iss)
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{
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u64 reg = iss & (ESR_ISS_MSR_OP0 | ESR_ISS_MSR_OP2 | ESR_ISS_MSR_OP1 | ESR_ISS_MSR_CRn |
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ESR_ISS_MSR_CRm);
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u64 rt = FIELD_GET(ESR_ISS_MSR_Rt, iss);
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bool is_read = iss & ESR_ISS_MSR_DIR;
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u64 *regs = ctx->regs;
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regs[31] = 0;
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switch (reg) {
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@ -244,9 +231,19 @@ static bool hv_handle_msr(u64 *regs, u64 iss)
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return false;
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}
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static void hv_exc_entry(u64 *regs)
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static void hv_exc_entry(struct exc_info *ctx)
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{
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UNUSED(regs);
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ctx->spsr = hv_get_spsr();
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ctx->elr = hv_get_elr();
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ctx->esr = hv_get_esr();
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ctx->far = hv_get_far();
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ctx->afsr1 = hv_get_afsr1();
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ctx->sp[0] = mrs(SP_EL0);
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ctx->sp[1] = mrs(SP_EL1);
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ctx->sp[2] = (u64)ctx;
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ctx->cpu_id = smp_id();
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ctx->mpidr = mrs(MPIDR_EL1);
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__atomic_sub_fetch(&hv_cpus_in_guest, 1, __ATOMIC_ACQUIRE);
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spin_lock(&bhl);
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hv_wdt_breadcrumb('X');
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@ -257,9 +254,8 @@ static void hv_exc_entry(u64 *regs)
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msr(SYS_IMP_APL_PMCR0, pmcr0 & ~PMCR0_CNT_MASK);
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}
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static void hv_exc_exit(u64 *regs)
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static void hv_exc_exit(struct exc_info *ctx)
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{
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UNUSED(regs);
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hv_wdt_breadcrumb('x');
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hv_update_fiq();
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/* reenable PMU counters */
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@ -267,30 +263,34 @@ static void hv_exc_exit(u64 *regs)
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msr(CNTVOFF_EL2, stolen_time);
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spin_unlock(&bhl);
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__atomic_add_fetch(&hv_cpus_in_guest, 1, __ATOMIC_ACQUIRE);
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hv_set_spsr(ctx->spsr);
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hv_set_elr(ctx->elr);
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msr(SP_EL0, ctx->sp[0]);
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msr(SP_EL1, ctx->sp[1]);
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}
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void hv_exc_sync(u64 *regs)
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void hv_exc_sync(struct exc_info *ctx)
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{
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hv_wdt_breadcrumb('S');
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hv_exc_entry(regs);
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hv_exc_entry(ctx);
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bool handled = false;
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u64 esr = hv_get_esr();
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u32 ec = FIELD_GET(ESR_EC, esr);
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u32 ec = FIELD_GET(ESR_EC, ctx->esr);
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switch (ec) {
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case ESR_EC_DABORT_LOWER:
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hv_wdt_breadcrumb('D');
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handled = hv_handle_dabort(regs);
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handled = hv_handle_dabort(ctx);
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break;
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case ESR_EC_MSR:
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hv_wdt_breadcrumb('M');
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handled = hv_handle_msr(regs, FIELD_GET(ESR_ISS, esr));
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handled = hv_handle_msr(ctx, FIELD_GET(ESR_ISS, ctx->esr));
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break;
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case ESR_EC_IMPDEF:
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hv_wdt_breadcrumb('A');
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switch (FIELD_GET(ESR_ISS, esr)) {
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switch (FIELD_GET(ESR_ISS, ctx->esr)) {
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case ESR_ISS_IMPDEF_MSR:
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handled = hv_handle_msr(regs, hv_get_afsr1());
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handled = hv_handle_msr(ctx, ctx->afsr1);
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break;
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}
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break;
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@ -298,38 +298,38 @@ void hv_exc_sync(u64 *regs)
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if (handled) {
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hv_wdt_breadcrumb('+');
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hv_set_elr(hv_get_elr() + 4);
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ctx->elr += 4;
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} else {
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hv_wdt_breadcrumb('-');
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hv_exc_proxy(regs, START_EXCEPTION_LOWER, EXC_SYNC, NULL);
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hv_exc_proxy(ctx, START_EXCEPTION_LOWER, EXC_SYNC, NULL);
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}
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hv_exc_exit(regs);
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hv_exc_exit(ctx);
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hv_wdt_breadcrumb('s');
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}
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void hv_exc_irq(u64 *regs)
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void hv_exc_irq(struct exc_info *ctx)
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{
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hv_wdt_breadcrumb('I');
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hv_exc_entry(regs);
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hv_exc_proxy(regs, START_EXCEPTION_LOWER, EXC_IRQ, NULL);
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hv_exc_exit(regs);
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hv_exc_entry(ctx);
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hv_exc_proxy(ctx, START_EXCEPTION_LOWER, EXC_IRQ, NULL);
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hv_exc_exit(ctx);
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hv_wdt_breadcrumb('i');
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}
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void hv_exc_fiq(u64 *regs)
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void hv_exc_fiq(struct exc_info *ctx)
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{
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hv_wdt_breadcrumb('F');
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hv_exc_entry(regs);
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hv_exc_entry(ctx);
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if (mrs(CNTP_CTL_EL0) == (CNTx_CTL_ISTATUS | CNTx_CTL_ENABLE)) {
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msr(CNTP_CTL_EL0, CNTx_CTL_ISTATUS | CNTx_CTL_IMASK | CNTx_CTL_ENABLE);
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hv_tick(regs);
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hv_tick(ctx);
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hv_arm_tick();
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}
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if (mrs(CNTV_CTL_EL0) == (CNTx_CTL_ISTATUS | CNTx_CTL_ENABLE)) {
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msr(CNTV_CTL_EL0, CNTx_CTL_ISTATUS | CNTx_CTL_IMASK | CNTx_CTL_ENABLE);
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hv_exc_proxy(regs, START_HV, HV_VTIMER, NULL);
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hv_exc_proxy(ctx, START_HV, HV_VTIMER, NULL);
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}
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u64 reg = mrs(SYS_IMP_APL_PMCR0);
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@ -345,7 +345,7 @@ void hv_exc_fiq(u64 *regs)
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if ((reg & UPMCR0_IMODE_MASK) == UPMCR0_IMODE_FIQ && (mrs(SYS_IMP_APL_UPMSR) & UPMSR_IACT)) {
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printf("[FIQ] UPMC IRQ, masking");
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reg_clr(SYS_IMP_APL_UPMCR0, UPMCR0_IMODE_MASK);
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hv_exc_proxy(regs, START_EXCEPTION_LOWER, EXC_FIQ, NULL);
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hv_exc_proxy(ctx, START_EXCEPTION_LOWER, EXC_FIQ, NULL);
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}
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if (mrs(SYS_IMP_APL_IPI_SR_EL1) & IPI_SR_PENDING) {
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msr(SYS_IMP_APL_IPI_SR_EL1, IPI_SR_PENDING);
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sysop("isb");
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}
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hv_check_rendezvous(regs);
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hv_check_rendezvous(ctx);
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// Handles guest timers
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hv_exc_exit(regs);
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hv_exc_exit(ctx);
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hv_wdt_breadcrumb('f');
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}
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void hv_exc_serr(u64 *regs)
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void hv_exc_serr(struct exc_info *ctx)
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{
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hv_wdt_breadcrumb('E');
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hv_exc_entry(regs);
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hv_exc_proxy(regs, START_EXCEPTION_LOWER, EXC_SERROR, NULL);
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hv_exc_exit(regs);
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hv_exc_entry(ctx);
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hv_exc_proxy(ctx, START_EXCEPTION_LOWER, EXC_SERROR, NULL);
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hv_exc_exit(ctx);
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hv_wdt_breadcrumb('e');
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}
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20
src/hv_vm.c
20
src/hv_vm.c
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@ -443,11 +443,12 @@ union simd_reg {
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u8 b[16];
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};
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static bool emulate_load(u64 *regs, u32 insn, u64 *val, u64 *width)
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static bool emulate_load(struct exc_info *ctx, u32 insn, u64 *val, u64 *width)
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{
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u64 Rt = insn & 0x1f;
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u64 Rn = (insn >> 5) & 0x1f;
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u64 imm9 = EXT((insn >> 12) & 0x1ff, 9);
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u64 *regs = ctx->regs;
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union simd_reg simd[32];
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@ -571,11 +572,12 @@ static bool emulate_load(u64 *regs, u32 insn, u64 *val, u64 *width)
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return true;
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}
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static bool emulate_store(u64 *regs, u32 insn, u64 *val, u64 *width)
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static bool emulate_store(struct exc_info *ctx, u32 insn, u64 *val, u64 *width)
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{
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u64 Rt = insn & 0x1f;
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u64 Rn = (insn >> 5) & 0x1f;
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u64 imm9 = EXT((insn >> 12) & 0x1ff, 9);
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u64 *regs = ctx->regs;
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*width = insn >> 30;
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@ -701,7 +703,7 @@ bool hv_pa_rw(u64 addr, u64 *val, bool write, int width)
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return hv_pa_read(addr, val, width);
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}
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bool hv_handle_dabort(u64 *regs)
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bool hv_handle_dabort(struct exc_info *ctx)
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{
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hv_wdt_breadcrumb('0');
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u64 esr = hv_get_esr();
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@ -740,7 +742,7 @@ bool hv_handle_dabort(u64 *regs)
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u64 target = pte & PTE_TARGET_MASK_L4;
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u64 paddr = target | (far & MASK(VADDR_L4_OFFSET_BITS));
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u64 elr = hv_get_elr();
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u64 elr = ctx->elr;
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u64 elr_pa = hv_translate(elr, false, false);
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if (!elr_pa) {
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printf("HV: Failed to fetch instruction for data abort at 0x%lx\n", elr);
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@ -756,7 +758,7 @@ bool hv_handle_dabort(u64 *regs)
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if (esr & ESR_ISS_DABORT_WnR) {
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hv_wdt_breadcrumb('W');
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if (!emulate_store(regs, insn, val, &width)) {
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if (!emulate_store(ctx, insn, val, &width)) {
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printf("HV: store not emulated: 0x%08x at 0x%lx\n", insn, ipa);
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return false;
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}
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@ -797,7 +799,7 @@ bool hv_handle_dabort(u64 *regs)
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.addr = ipa,
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.data = {val[0], val[1]},
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};
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hv_exc_proxy(regs, START_HV, HV_HOOK_VM, &hook);
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hv_exc_proxy(ctx, START_HV, HV_HOOK_VM, &hook);
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break;
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}
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default:
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@ -807,7 +809,7 @@ bool hv_handle_dabort(u64 *regs)
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} else {
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hv_wdt_breadcrumb('R');
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if (!emulate_load(regs, insn, NULL, &width)) {
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if (!emulate_load(ctx, insn, NULL, &width)) {
|
||||
printf("HV: load not emulated: 0x%08x at 0x%lx\n", insn, ipa);
|
||||
return false;
|
||||
}
|
||||
|
@ -841,7 +843,7 @@ bool hv_handle_dabort(u64 *regs)
|
|||
.id = FIELD_GET(PTE_TARGET_MASK_L4, pte),
|
||||
.addr = ipa,
|
||||
};
|
||||
hv_exc_proxy(regs, START_HV, HV_HOOK_VM, &hook);
|
||||
hv_exc_proxy(ctx, START_HV, HV_HOOK_VM, &hook);
|
||||
memcpy(val, hook.data, sizeof(val));
|
||||
break;
|
||||
}
|
||||
|
@ -855,7 +857,7 @@ bool hv_handle_dabort(u64 *regs)
|
|||
emit_mmiotrace(elr, ipa, val, width, 0, pte & SPTE_TRACE_UNBUF);
|
||||
|
||||
hv_wdt_breadcrumb('8');
|
||||
if (!emulate_load(regs, insn, val, &width))
|
||||
if (!emulate_load(ctx, insn, val, &width))
|
||||
return false;
|
||||
|
||||
hv_wdt_breadcrumb('9');
|
||||
|
|
Loading…
Reference in a new issue