mirror of
https://github.com/drasko/codezero.git
synced 2026-01-28 02:33:18 +01:00
d306d6b451
Modifying task_virt_to_page() so that it takes into account page protections. If mm0 writes to a task page that is meant to be read-only, (e.g. the zero page) the design is broken. Every access to a task's page will take the page fault route, and the page fault handler will return the page instead of 0.
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/*
|
|
* Generic to arch-specific interface for
|
|
* exchange_registers()
|
|
*
|
|
* Copyright (C) 2008 Bahadir Balban
|
|
*/
|
|
#include <l4/macros.h>
|
|
#include <l4lib/exregs.h>
|
|
#include <l4lib/arch/syslib.h>
|
|
#include INC_GLUE(message.h)
|
|
|
|
void exregs_print_registers(void)
|
|
{
|
|
struct exregs_data exregs;
|
|
|
|
/* Read registers */
|
|
memset(&exregs, 0, sizeof(exregs));
|
|
exregs.valid_vect = ~0; /* Set all flags */
|
|
exregs.flags |= EXREGS_READ;
|
|
exregs.flags |= EXREGS_SET_UTCB;
|
|
exregs.flags |= EXREGS_SET_PAGER;
|
|
BUG_ON(l4_exchange_registers(&exregs, self_tid()) < 0);
|
|
|
|
/* Print out registers */
|
|
printf("Task (%x) register state upon fault:\n", self_tid());
|
|
printf("R0: 0x%x\n", exregs.context.r0);
|
|
printf("R1: 0x%x\n", exregs.context.r1);
|
|
printf("R2: 0x%x\n", exregs.context.r2);
|
|
printf("R3: 0x%x\n", exregs.context.r3);
|
|
printf("R4: 0x%x\n", exregs.context.r4);
|
|
printf("R5: 0x%x\n", exregs.context.r5);
|
|
printf("R6: 0x%x\n", exregs.context.r6);
|
|
printf("R7: 0x%x\n", exregs.context.r7);
|
|
printf("R8: 0x%x\n", exregs.context.r8);
|
|
printf("R9: 0x%x\n", exregs.context.r9);
|
|
printf("R10: 0x%x\n", exregs.context.r10);
|
|
printf("R11: 0x%x\n", exregs.context.r11);
|
|
printf("R12: 0x%x\n", exregs.context.r12);
|
|
printf("R13: 0x%x\n", exregs.context.sp);
|
|
printf("R14: 0x%x\n", exregs.context.lr);
|
|
printf("R15: 0x%x\n", exregs.context.pc);
|
|
printf("Pager: 0x%x\n", exregs.pagerid);
|
|
printf("Utcb @ 0x%lx\n", exregs.utcb_address);
|
|
}
|
|
|
|
void exregs_set_mr(struct exregs_data *s, int offset, unsigned long val)
|
|
{
|
|
/* Get MR0 */
|
|
u32 *mr = &s->context.MR0_REGISTER;
|
|
|
|
/* Sanity check */
|
|
BUG_ON(offset > MR_TOTAL || offset < 0);
|
|
|
|
/* Set MR */
|
|
mr[offset] = val;
|
|
|
|
/* Set valid bit for mr register */
|
|
s->valid_vect |= FIELD_TO_BIT(exregs_context_t, MR0_REGISTER) << offset;
|
|
}
|
|
|
|
void exregs_set_pager(struct exregs_data *s, l4id_t pagerid)
|
|
{
|
|
s->pagerid = pagerid;
|
|
s->flags |= EXREGS_SET_PAGER;
|
|
}
|
|
|
|
void exregs_set_utcb(struct exregs_data *s, unsigned long virt)
|
|
{
|
|
s->utcb_address = virt;
|
|
s->flags |= EXREGS_SET_UTCB;
|
|
}
|
|
|
|
void exregs_set_stack(struct exregs_data *s, unsigned long sp)
|
|
{
|
|
s->context.sp = sp;
|
|
s->valid_vect |= FIELD_TO_BIT(exregs_context_t, sp);
|
|
}
|
|
|
|
void exregs_set_pc(struct exregs_data *s, unsigned long pc)
|
|
{
|
|
s->context.pc = pc;
|
|
s->valid_vect |= FIELD_TO_BIT(exregs_context_t, pc);
|
|
}
|
|
|