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arm baremetal: SVC explain where the imm16 can be retrieved

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Use upper case hex literals on all PRIXnn.

.gitignore /out.docker
This commit is contained in:
Ciro Santilli 六四事件 法轮功
2019-07-16 00:00:01 +00:00
parent b1bfd46efe
commit b38e2b0da9
10 changed files with 140 additions and 75 deletions
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93
baremetal/arch/aarch64/svc.c
View File

@@ -11,55 +11,68 @@ int myvar = 0;
void lkmc_vector_trap_handler(LkmcVectorExceptionFrame *exception) {
puts("lkmc_vector_trap_handler");
printf("exc_type 0x%" PRIx64 "\n", exception->exc_type);
printf("exc_type 0x%" PRIX64 "\n", exception->exc_type);
if (exception->exc_type == LKMC_VECTOR_SYNC_SPX) {
puts("exc_type is LKMC_VECTOR_SYNC_SPX");
}
printf("ESR 0x%" PRIx64 "\n", exception->exc_esr);
printf("SP 0x%" PRIx64 "\n", exception->exc_sp);
printf("ELR 0x%" PRIx64 "\n", exception->exc_elr);
printf("SPSR 0x%" PRIx64 "\n", exception->exc_spsr);
printf("x0 0x%" PRIx64 "\n", exception->x0);
printf("x1 0x%" PRIx64 "\n", exception->x1);
printf("x2 0x%" PRIx64 "\n", exception->x2);
printf("x3 0x%" PRIx64 "\n", exception->x3);
printf("x4 0x%" PRIx64 "\n", exception->x4);
printf("x5 0x%" PRIx64 "\n", exception->x5);
printf("x6 0x%" PRIx64 "\n", exception->x6);
printf("x7 0x%" PRIx64 "\n", exception->x7);
printf("x8 0x%" PRIx64 "\n", exception->x8);
printf("x9 0x%" PRIx64 "\n", exception->x9);
printf("x10 0x%" PRIx64 "\n", exception->x10);
printf("x11 0x%" PRIx64 "\n", exception->x11);
printf("x12 0x%" PRIx64 "\n", exception->x12);
printf("x13 0x%" PRIx64 "\n", exception->x13);
printf("x14 0x%" PRIx64 "\n", exception->x14);
printf("x15 0x%" PRIx64 "\n", exception->x15);
printf("x16 0x%" PRIx64 "\n", exception->x16);
printf("x17 0x%" PRIx64 "\n", exception->x17);
printf("x18 0x%" PRIx64 "\n", exception->x18);
printf("x19 0x%" PRIx64 "\n", exception->x19);
printf("x20 0x%" PRIx64 "\n", exception->x20);
printf("x21 0x%" PRIx64 "\n", exception->x21);
printf("x22 0x%" PRIx64 "\n", exception->x22);
printf("x23 0x%" PRIx64 "\n", exception->x23);
printf("x24 0x%" PRIx64 "\n", exception->x24);
printf("x25 0x%" PRIx64 "\n", exception->x25);
printf("x26 0x%" PRIx64 "\n", exception->x26);
printf("x27 0x%" PRIx64 "\n", exception->x27);
printf("x28 0x%" PRIx64 "\n", exception->x28);
printf("x29 0x%" PRIx64 "\n", exception->x29);
printf("x30 0x%" PRIx64 "\n", exception->x30);
printf("ESR 0x%" PRIX64 "\n", exception->exc_esr);
uint64_t esr_ec = (exception->exc_esr >> 26) & 0x3F;
uint64_t iss = exception->exc_esr & 0xFFFFFF;
printf("ESR.EC 0x%" PRIX64 "\n", esr_ec);
if (
esr_ec == LKMC_ESR_EC_SVC_AARCH32 ||
esr_ec == LKMC_ESR_EC_SVC_AARCH64
) {
printf("ESR.EC.ISS.imm16 0x%" PRIX64 "\n", iss & 0xFFFF);
}
printf("SP 0x%" PRIX64 "\n", exception->exc_sp);
printf("ELR 0x%" PRIX64 "\n", exception->exc_elr);
printf("SPSR 0x%" PRIX64 "\n", exception->exc_spsr);
printf("x0 0x%" PRIX64 "\n", exception->x0);
printf("x1 0x%" PRIX64 "\n", exception->x1);
printf("x2 0x%" PRIX64 "\n", exception->x2);
printf("x3 0x%" PRIX64 "\n", exception->x3);
printf("x4 0x%" PRIX64 "\n", exception->x4);
printf("x5 0x%" PRIX64 "\n", exception->x5);
printf("x6 0x%" PRIX64 "\n", exception->x6);
printf("x7 0x%" PRIX64 "\n", exception->x7);
printf("x8 0x%" PRIX64 "\n", exception->x8);
printf("x9 0x%" PRIX64 "\n", exception->x9);
printf("x10 0x%" PRIX64 "\n", exception->x10);
printf("x11 0x%" PRIX64 "\n", exception->x11);
printf("x12 0x%" PRIX64 "\n", exception->x12);
printf("x13 0x%" PRIX64 "\n", exception->x13);
printf("x14 0x%" PRIX64 "\n", exception->x14);
printf("x15 0x%" PRIX64 "\n", exception->x15);
printf("x16 0x%" PRIX64 "\n", exception->x16);
printf("x17 0x%" PRIX64 "\n", exception->x17);
printf("x18 0x%" PRIX64 "\n", exception->x18);
printf("x19 0x%" PRIX64 "\n", exception->x19);
printf("x20 0x%" PRIX64 "\n", exception->x20);
printf("x21 0x%" PRIX64 "\n", exception->x21);
printf("x22 0x%" PRIX64 "\n", exception->x22);
printf("x23 0x%" PRIX64 "\n", exception->x23);
printf("x24 0x%" PRIX64 "\n", exception->x24);
printf("x25 0x%" PRIX64 "\n", exception->x25);
printf("x26 0x%" PRIX64 "\n", exception->x26);
printf("x27 0x%" PRIX64 "\n", exception->x27);
printf("x28 0x%" PRIX64 "\n", exception->x28);
printf("x29 0x%" PRIX64 "\n", exception->x29);
printf("x30 0x%" PRIX64 "\n", exception->x30);
myvar = 1;
}
int main(void) {
/* View initial relevant register values. */
printf("daif 0x%" PRIx32 "\n", lkmc_sysreg_daif_read());
printf("spsel 0x%" PRIx32 "\n", lkmc_sysreg_spsel_read());
printf("vbar_el1 0x%" PRIx64 "\n", lkmc_sysreg_vbar_el1_read());
printf("DAIF 0x%" PRIX32 "\n", lkmc_sysreg_daif_read());
printf("SPSEL 0x%" PRIX32 "\n", lkmc_sysreg_spsel_read());
printf("VBAR_EL1 0x%" PRIX64 "\n", lkmc_sysreg_vbar_el1_read());
/* https://stackoverflow.com/questions/1777990/is-it-possible-to-store-the-address-of-a-label-in-a-variable-and-use-goto-to-jum */
printf("after_svc %p\n", &&after_svc);
assert(myvar == 0);
LKMC_SVC(0x42);
/* Max 16-bits. */
LKMC_SVC(0xABCD);
after_svc:
assert(myvar == 1);
return 0;
}

2
baremetal/arch/aarch64/svc_asm.S
View File

@@ -5,7 +5,7 @@
.global main
main:
/* Do the svc. */
svc 0
svc 0xABCD
/* Confirm that svc was called and modified myvar. */
ldr x0, myvar

16
baremetal/arch/aarch64/timer.c
View File

@@ -5,7 +5,7 @@
#include <lkmc/gicv3.h>
void lkmc_vector_trap_handler(LkmcVectorExceptionFrame *exception __attribute__((unused))) {
printf("CNTVCT_EL0 0x%" PRIx64 "\n", lkmc_sysreg_cntvct_el0_read());
printf("CNTVCT_EL0 0x%" PRIX64 "\n", lkmc_sysreg_cntvct_el0_read());
}
#define CNTV_CTL_ENABLE (1 << 0) /* Enables the timer */
@@ -30,14 +30,14 @@ void enable_irq(void) {
int main(void) {
/* Initial state. */
printf("CNTV_CTL_EL0 0x%" PRIx32 "\n", lkmc_sysreg_cntv_ctl_el0_read());
printf("CNTFRQ_EL0 0x%" PRIx64 "\n", lkmc_sysreg_cntfrq_el0_read());
printf("CNTV_CVAL_EL0 0x%" PRIx64 "\n", lkmc_sysreg_cntv_cval_el0_read());
printf("CNTV_CTL_EL0 0x%" PRIX32 "\n", lkmc_sysreg_cntv_ctl_el0_read());
printf("CNTFRQ_EL0 0x%" PRIX64 "\n", lkmc_sysreg_cntfrq_el0_read());
printf("CNTV_CVAL_EL0 0x%" PRIX64 "\n", lkmc_sysreg_cntv_cval_el0_read());
/* Get the counter value many times to watch the time pass. */
printf("CNTVCT_EL0 0x%" PRIx64 "\n", lkmc_sysreg_cntvct_el0_read());
printf("CNTVCT_EL0 0x%" PRIx64 "\n", lkmc_sysreg_cntvct_el0_read());
printf("CNTVCT_EL0 0x%" PRIx64 "\n", lkmc_sysreg_cntvct_el0_read());
printf("CNTVCT_EL0 0x%" PRIX64 "\n", lkmc_sysreg_cntvct_el0_read());
printf("CNTVCT_EL0 0x%" PRIX64 "\n", lkmc_sysreg_cntvct_el0_read());
printf("CNTVCT_EL0 0x%" PRIX64 "\n", lkmc_sysreg_cntvct_el0_read());
/**/
gic_v3_initialize();
@@ -66,7 +66,7 @@ int main(void) {
/* TODO crashes gem5. */
puts("cntfrq_el0 = 1");
lkmc_sysreg_cntfrq_el0_write(1);
printf("cntfrq_el0 0x%" PRIx64 "\n", lkmc_sysreg_cntfrq_el0_read());
printf("cntfrq_el0 0x%" PRIX64 "\n", lkmc_sysreg_cntfrq_el0_read());
#endif
return 0;

5
baremetal/lib/aarch64.S
View File

@@ -28,7 +28,10 @@ lkmc_start:
LKMC_VECTOR_TABLE
/* Default trap handler. */
/* Default handler for exceptions. This is called after some basic
* setup done on the initial handler. Since this is a weak symbol,
* you can redefine it in your own example, and your definition
* will take precedence. */
LKMC_WEAK(lkmc_vector_trap_handler)
ldr x0, =lkmc_vector_trap_handler_error_message
bl puts