arm64: Make exceptions work
BUG=chrome-os-partner:31515 BRANCH=None TEST=test_exception generates a page fault which is handled by the exception handler and execution continues after eret from the exception Change-Id: Ie550492d2ed21b2c3009b5627f1e1a37429e6af0 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: e29fe77745d10e840c02498e54a0c53835530e5e Original-Change-Id: I29b7dabaece9b11a04ee3628d83513d30eb07b1d Original-Signed-off-by: Furquan Shaikh <furquan@google.com> Original-Reviewed-on: https://chromium-review.googlesource.com/213661 Original-Tested-by: Furquan Shaikh <furquan@chromium.org> Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org> Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org> Reviewed-on: http://review.coreboot.org/9000 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Furquan Shaikh
Patrick Georgi
parent
1af7b5ddf1
commit
69761cd165
|
|
@ -32,98 +32,110 @@
|
|||
#include <arch/cache.h>
|
||||
#include <arch/exception.h>
|
||||
#include <console/console.h>
|
||||
#include <arch/lib_helpers.h>
|
||||
|
||||
void exception_sync_el0(uint64_t *regs, uint64_t esr);
|
||||
void exception_irq_el0(uint64_t *regs, uint64_t esr);
|
||||
void exception_fiq_el0(uint64_t *regs, uint64_t esr);
|
||||
void exception_serror_el0(uint64_t *regs, uint64_t esr);
|
||||
void exception_sync(uint64_t *regs, uint64_t esr);
|
||||
void exception_irq(uint64_t *regs, uint64_t esr);
|
||||
void exception_fiq(uint64_t *regs, uint64_t esr);
|
||||
void exception_serror(uint64_t *regs, uint64_t esr);
|
||||
static unsigned int test_exc;
|
||||
|
||||
static void print_regs(uint64_t *regs)
|
||||
struct exception_handler_info
|
||||
{
|
||||
const char *name;
|
||||
};
|
||||
|
||||
enum {
|
||||
EXC_SYNC_SP0 = 0,
|
||||
EXC_IRQ_SP0,
|
||||
EXC_FIQ_SP0,
|
||||
EXC_SERROR_SP0,
|
||||
EXC_SYNC_SP3,
|
||||
EXC_IRQ_SP3,
|
||||
EXC_FIQ_SP3,
|
||||
EXC_SERROR_SP3,
|
||||
EXC_SYNC_ELX_64,
|
||||
EXC_IRQ_ELX_64,
|
||||
EXC_FIQ_ELX_64,
|
||||
EXC_SERROR_ELX_64,
|
||||
EXC_SYNC_ELX_32,
|
||||
EXC_IRQ_ELX_32,
|
||||
EXC_FIQ_ELX_32,
|
||||
EXC_SERROR_ELX_32,
|
||||
EXC_COUNT
|
||||
};
|
||||
|
||||
static struct exception_handler_info exceptions[EXC_COUNT] = {
|
||||
[EXC_SYNC_SP0] = { "_sync_sp_el0" },
|
||||
[EXC_IRQ_SP0] = { "_irq_sp_el0" },
|
||||
[EXC_FIQ_SP0] = { "_fiq_sp_el0" },
|
||||
[EXC_SERROR_SP0] = {"_serror_sp_el0"},
|
||||
[EXC_SYNC_SP3] = { "_sync_sp_el3" },
|
||||
[EXC_IRQ_SP3] = { "_irq_sp_el3" },
|
||||
[EXC_FIQ_SP3] = { "_fiq_sp_el3" },
|
||||
[EXC_SERROR_SP3] = {"_serror_sp_el3"},
|
||||
[EXC_SYNC_ELX_64] = { "_sync_elx_64" },
|
||||
[EXC_IRQ_ELX_64] = { "_irq_elx_64" },
|
||||
[EXC_FIQ_ELX_64] = { "_fiq_elx_64" },
|
||||
[EXC_SERROR_ELX_64] = {"_serror_elx_64"},
|
||||
[EXC_SYNC_ELX_32] = { "_sync_elx_32" },
|
||||
[EXC_IRQ_ELX_32] = { "_irq_elx_32" },
|
||||
[EXC_FIQ_ELX_32] = { "_fiq_elx_32" },
|
||||
[EXC_SERROR_ELX_32] = {"_serror_elx_32"},
|
||||
};
|
||||
|
||||
static void print_regs(struct exception_state *state)
|
||||
{
|
||||
int i;
|
||||
uint64_t far_el3;
|
||||
|
||||
/* ELR contains the restart PC at target exception level */
|
||||
printk(BIOS_ERR, "ELR = 0x%016llx ", regs[0]);
|
||||
printk(BIOS_ERR, "X00 = 0x%016llx\n", regs[1]);
|
||||
far_el3 = raw_read_far_el3();
|
||||
|
||||
for (i = 2; i < 31; i+=2) {
|
||||
printk(BIOS_ERR, "X%02d = 0x%016llx ", i - 1, regs[i]);
|
||||
printk(BIOS_ERR, "X%02d = 0x%016llx\n", i, regs[i + 1]);
|
||||
}
|
||||
printk(BIOS_DEBUG, "ELR = 0x%016llx\n", state->elr);
|
||||
printk(BIOS_DEBUG, "ESR = 0x%08llx\n", state->esr);
|
||||
printk(BIOS_DEBUG, "FAR_EL3 = 0x%016llx\n", far_el3);
|
||||
for (i = 0; i < 31; i++)
|
||||
printk(BIOS_DEBUG, "X%02d = 0x%016llx\n", i, state->regs[i]);
|
||||
}
|
||||
|
||||
void exception_sync_el0(uint64_t *regs, uint64_t esr)
|
||||
void exception_dispatch(struct exception_state *state, int idx)
|
||||
{
|
||||
printk(BIOS_ERR, "exception _sync_el0 (ESR = 0x%08llx)\n", esr);
|
||||
print_regs(regs);
|
||||
if (idx >= EXC_COUNT) {
|
||||
printk(BIOS_DEBUG, "Bad exception index %d.\n", idx);
|
||||
} else {
|
||||
struct exception_handler_info *info = &exceptions[idx];
|
||||
|
||||
if (info->name)
|
||||
printk(BIOS_DEBUG, "exception %s\n", info->name);
|
||||
else
|
||||
printk(BIOS_DEBUG, "exception _not_used.\n");
|
||||
}
|
||||
print_regs(state);
|
||||
|
||||
if (test_exc) {
|
||||
state->elr += 4;
|
||||
test_exc = 0;
|
||||
printk(BIOS_DEBUG, "new ELR = 0x%016llx\n", state->elr);
|
||||
} else
|
||||
die("exception");
|
||||
}
|
||||
|
||||
void exception_irq_el0(uint64_t *regs, uint64_t esr)
|
||||
static uint64_t test_exception(void)
|
||||
{
|
||||
printk(BIOS_ERR, "exception _irq_el0 (ESR = 0x%08llx)\n", esr);
|
||||
print_regs(regs);
|
||||
die("exception");
|
||||
}
|
||||
uint64_t *a = (uint64_t *)0xfffffffff0000000ULL;
|
||||
|
||||
void exception_fiq_el0(uint64_t *regs, uint64_t esr)
|
||||
{
|
||||
printk(BIOS_ERR, "exception _fiq_el0 (ESR = 0x%08llx)\n", esr);
|
||||
print_regs(regs);
|
||||
die("exception");
|
||||
}
|
||||
test_exc = 1;
|
||||
|
||||
void exception_serror_el0(uint64_t *regs, uint64_t esr)
|
||||
{
|
||||
printk(BIOS_ERR, "exception _serror_el0 (ESR = 0x%08llx)\n", esr);
|
||||
print_regs(regs);
|
||||
die("exception");
|
||||
}
|
||||
printk(BIOS_DEBUG, "%llx\n", *a);
|
||||
|
||||
void exception_sync(uint64_t *regs, uint64_t esr)
|
||||
{
|
||||
printk(BIOS_ERR, "exception _sync (ESR = 0x%08llx)\n", esr);
|
||||
print_regs(regs);
|
||||
die("exception");
|
||||
}
|
||||
|
||||
void exception_irq(uint64_t *regs, uint64_t esr)
|
||||
{
|
||||
printk(BIOS_ERR, "exception _irq (ESR = 0x%08llx)\n", esr);
|
||||
print_regs(regs);
|
||||
die("exception");
|
||||
}
|
||||
|
||||
void exception_fiq(uint64_t *regs, uint64_t esr)
|
||||
{
|
||||
printk(BIOS_ERR, "exception _fiq (ESR = 0x%08llx)\n", esr);
|
||||
print_regs(regs);
|
||||
die("exception");
|
||||
}
|
||||
|
||||
void exception_serror(uint64_t *regs, uint64_t esr)
|
||||
{
|
||||
printk(BIOS_ERR, "exception _serror (ESR = 0x%08llx)\n", esr);
|
||||
print_regs(regs);
|
||||
die("exception");
|
||||
return 0;
|
||||
}
|
||||
|
||||
void exception_init(void)
|
||||
{
|
||||
//uint32_t sctlr = read_sctlr();
|
||||
/* Handle exceptions in ARM mode. */
|
||||
//sctlr &= ~SCTLR_TE;
|
||||
/* Set V=0 in SCTLR so VBAR points to the exception vector table. */
|
||||
//sctlr &= ~SCTLR_V;
|
||||
/* Enforce alignment temporarily. */
|
||||
//write_sctlr(sctlr);
|
||||
extern void *exception_table;
|
||||
|
||||
extern uint32_t exception_table[];
|
||||
set_vbar((uintptr_t)exception_table);
|
||||
set_vbar(&exception_table);
|
||||
|
||||
printk(BIOS_DEBUG, "Exception handlers installed.\n");
|
||||
printk(BIOS_DEBUG, "ARM64: Exception handlers installed.\n");
|
||||
|
||||
printk(BIOS_DEBUG, "ARM64: Testing exception\n");
|
||||
test_exception();
|
||||
printk(BIOS_DEBUG, "ARM64: Done test exception\n");
|
||||
}
|
||||
|
|
|
|||
|
|
@ -29,75 +29,98 @@
|
|||
|
||||
#include <arch/asm.h>
|
||||
|
||||
.text
|
||||
.macro eentry lbl id
|
||||
.align 7
|
||||
\lbl:
|
||||
stp x30, xzr, [sp, #-16]!
|
||||
bl exception_prologue
|
||||
mov x1, \id
|
||||
bl exception_handler
|
||||
.endm
|
||||
|
||||
.align 11
|
||||
.global exception_table
|
||||
|
||||
exception_table:
|
||||
.align 7
|
||||
bl exception_prologue
|
||||
bl exception_sync_el0
|
||||
.align 7
|
||||
bl exception_prologue
|
||||
bl exception_irq_el0
|
||||
.align 7
|
||||
bl exception_prologue
|
||||
bl exception_fiq_el0
|
||||
.align 7
|
||||
bl exception_prologue
|
||||
bl exception_serror_el0
|
||||
.align 7
|
||||
bl exception_prologue
|
||||
bl exception_sync
|
||||
.align 7
|
||||
bl exception_prologue
|
||||
bl exception_irq
|
||||
.align 7
|
||||
bl exception_prologue
|
||||
bl exception_fiq
|
||||
.align 7
|
||||
bl exception_prologue
|
||||
bl exception_serror
|
||||
|
||||
/*
|
||||
* Save state (register file + ELR) to stack
|
||||
* and set arguments x0 and x1 for exception call
|
||||
*/
|
||||
ENTRY(exception_prologue)
|
||||
stp x29, x30, [sp, #-16]!
|
||||
stp x27, x28, [sp, #-16]!
|
||||
stp x25, x26, [sp, #-16]!
|
||||
stp x23, x24, [sp, #-16]!
|
||||
stp x21, x22, [sp, #-16]!
|
||||
stp x19, x20, [sp, #-16]!
|
||||
stp x17, x18, [sp, #-16]!
|
||||
stp x15, x16, [sp, #-16]!
|
||||
stp x13, x14, [sp, #-16]!
|
||||
stp x11, x12, [sp, #-16]!
|
||||
stp x9, x10, [sp, #-16]!
|
||||
stp x7, x8, [sp, #-16]!
|
||||
stp x5, x6, [sp, #-16]!
|
||||
stp x3, x4, [sp, #-16]!
|
||||
stp x1, x2, [sp, #-16]!
|
||||
eentry sync_el3_sp0,#0
|
||||
eentry irq_el3_sp0,#1
|
||||
eentry fiq_el3_sp0,#2
|
||||
eentry serror_el3_sp0,#3
|
||||
eentry sync_el3_sp3,#4
|
||||
eentry irq_el3_sp3,#5
|
||||
eentry fiq_el3_sp3,#6
|
||||
eentry serror_el3_sp3,#7
|
||||
eentry sync_elx_64,#8
|
||||
eentry irq_elx_64,#9
|
||||
eentry fiq_elx_64,#10
|
||||
eentry serror_elx_64,#11
|
||||
eentry sync_elx_32,#12
|
||||
eentry irq_elx_32,#13
|
||||
eentry fiq_elx_32,#14
|
||||
eentry serror_elx_32,#15
|
||||
|
||||
/* FIXME: Don't assume always running in EL2 */
|
||||
mrs x1, elr_el2
|
||||
stp x1, x0, [sp, #-16]!
|
||||
exception_prologue:
|
||||
/* Save all registers x0-x29 */
|
||||
stp x28, x29, [sp, #-16]!
|
||||
stp x26, x27, [sp, #-16]!
|
||||
stp x24, x25, [sp, #-16]!
|
||||
stp x22, x23, [sp, #-16]!
|
||||
stp x20, x21, [sp, #-16]!
|
||||
stp x18, x19, [sp, #-16]!
|
||||
stp x16, x17, [sp, #-16]!
|
||||
stp x14, x15, [sp, #-16]!
|
||||
stp x12, x13, [sp, #-16]!
|
||||
stp x10, x11, [sp, #-16]!
|
||||
stp x8, x9, [sp, #-16]!
|
||||
stp x6, x7, [sp, #-16]!
|
||||
stp x4, x5, [sp, #-16]!
|
||||
stp x2, x3, [sp, #-16]!
|
||||
stp x0, x1, [sp, #-16]!
|
||||
|
||||
mrs x1, esr_el2
|
||||
mov x0, sp
|
||||
/* Save the exception reason on stack */
|
||||
mrs x1, esr_el3
|
||||
|
||||
/* Save the return address on stack */
|
||||
mrs x0, elr_el3
|
||||
stp x0, x1, [sp, #-16]!
|
||||
|
||||
ret
|
||||
ENDPROC(exception_prologue)
|
||||
|
||||
.global exception_stack_end
|
||||
exception_stack_end:
|
||||
.quad 0
|
||||
|
||||
exception_handler:
|
||||
.word 0
|
||||
/* Save address of saved registers into x0
|
||||
* This acts as first argument to exception_dispatch
|
||||
*/
|
||||
mov x0, sp
|
||||
bl exception_dispatch
|
||||
|
||||
/* Pop return address and exception reason saved on stack */
|
||||
ldp x0, x1, [sp], #16
|
||||
msr elr_el3, x0
|
||||
msr esr_el3, x1
|
||||
/* Pop registers x0-x30 */
|
||||
ldp x0, x1, [sp], #16
|
||||
ldp x2, x3, [sp], #16
|
||||
ldp x4, x5, [sp], #16
|
||||
ldp x6, x7, [sp], #16
|
||||
ldp x8, x9, [sp], #16
|
||||
ldp x10, x11, [sp], #16
|
||||
ldp x12, x13, [sp], #16
|
||||
ldp x14, x15, [sp], #16
|
||||
ldp x16, x17, [sp], #16
|
||||
ldp x18, x19, [sp], #16
|
||||
ldp x20, x21, [sp], #16
|
||||
ldp x22, x23, [sp], #16
|
||||
ldp x24, x25, [sp], #16
|
||||
ldp x26, x27, [sp], #16
|
||||
ldp x28, x29, [sp], #16
|
||||
ldp x30, xzr, [sp], #16
|
||||
eret
|
||||
|
||||
.global set_vbar
|
||||
set_vbar:
|
||||
msr vbar_el2, x0
|
||||
/* Initialize the exception table address in vbar for EL3 */
|
||||
msr vbar_el3, x0
|
||||
dsb sy
|
||||
isb
|
||||
ret
|
||||
|
|
|
|||
|
|
@ -32,7 +32,15 @@
|
|||
|
||||
#include <stdint.h>
|
||||
|
||||
struct exception_state
|
||||
{
|
||||
uint64_t elr;
|
||||
uint64_t esr;
|
||||
uint64_t regs[31];
|
||||
} __attribute__((packed));
|
||||
|
||||
void exception_init(void);
|
||||
void set_vbar(uint64_t vbar);
|
||||
void set_vbar(void *vbar);
|
||||
void exception_dispatch(struct exception_state *state, int idx);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in New Issue