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Added a flag to read registers back for sys_exregs call

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This commit is contained in:
Bahadir Balban
2009-11-05 11:27:29 +02:00
parent fd04e9d460
commit 425193efa9
2 changed files with 58 additions and 2 deletions
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2
include/l4/api/exregs.h
View File

@@ -13,6 +13,8 @@
#define EXREGS_SET_PAGER 1
#define EXREGS_SET_UTCB 2
#define EXREGS_READ 4
#define EXREGS_VALID_REGULAR_REGS \
(FIELD_TO_BIT(exregs_context_t, r0) | \
FIELD_TO_BIT(exregs_context_t, r1) | \

58
src/api/exregs.c
View File

@@ -13,7 +13,7 @@
#include <l4/api/exregs.h>
/* Copy each register to task's context if its valid bit is set */
void do_exchange_registers(struct ktcb *task, struct exregs_data *exregs)
void exregs_write_registers(struct ktcb *task, struct exregs_data *exregs)
{
task_context_t *context = &task->context;
@@ -78,6 +78,57 @@ flags:
}
}
void exregs_read_registers(struct ktcb *task, struct exregs_data *exregs)
{
task_context_t *context = &task->context;
if (!exregs->valid_vect)
goto flags;
/* Check register valid bit and copy registers */
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r0))
exregs->context.r0 = context->r0;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r1))
exregs->context.r1 = context->r1;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r2))
exregs->context.r2 = context->r2;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r3))
exregs->context.r3 = context->r3;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r4))
exregs->context.r4 = context->r4;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r5))
exregs->context.r5 = context->r5;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r6))
exregs->context.r6 = context->r6;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r7))
exregs->context.r7 = context->r7;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r8))
exregs->context.r8 = context->r8;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r9))
exregs->context.r9 = context->r9;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r10))
exregs->context.r10 = context->r10;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r11))
exregs->context.r11 = context->r11;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, r12))
exregs->context.r12 = context->r12;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, sp))
exregs->context.sp = context->sp;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, lr))
exregs->context.lr = context->lr;
if (exregs->valid_vect & FIELD_TO_BIT(exregs_context_t, pc))
exregs->context.pc = context->pc;
flags:
/* Read thread's pager if pager flag supplied */
if (exregs->flags & EXREGS_SET_PAGER)
exregs->pagerid = task->pagerid;
/* Read thread's utcb if utcb flag supplied */
if (exregs->flags & EXREGS_SET_UTCB)
exregs->utcb_address = task->utcb_address;
}
/*
* exchange_registers()
*
@@ -141,7 +192,10 @@ int sys_exchange_registers(struct exregs_data *exregs, l4id_t tid)
return -ENOCAP;
/* Copy registers */
do_exchange_registers(task, exregs);
if (exregs->flags & EXREGS_READ)
exregs_read_registers(task, exregs);
else
exregs_write_registers(task, exregs);
out:
/* Unlock and return */