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addrenv interface changes: up_addrenv_create() may need to create .text and .bss/.data separately because of differing access privileges (read/execute vs read/write). And, as a consequence, up_addrenv_vaddr() needs to be split into up_addrenv_vtext(0 and up_addrenv_vdata().

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This commit is contained in:
Gregory Nutt 2014-08-24 11:54:14 -06:00
parent 95c79c675c
commit dde84a0a20
2 changed files with 121 additions and 37 deletions
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94
arch/arm/src/armv7-a/arm_addrenv.c
View File

@ -42,8 +42,10 @@
*
* up_addrenv_create - Create an address environment
* up_addrenv_destroy - Destroy an address environment.
* up_addrenv_vaddr - Returns the virtual base address of the address
* environment
* up_addrenv_vtext - Returns the virtual base address of the .text
* address environment
* up_addrenv_vdata - Returns the virtual base address of the .bss/.data
* address environment
* up_addrenv_select - Instantiate an address environment
* up_addrenv_restore - Restore an address environment
* up_addrenv_assign - Assign an address environment to a group
@ -67,6 +69,7 @@
#include <nuttx/config.h>
#include <string.h>
#include <errno.h>
#include <nuttx/arch.h>
@ -102,8 +105,10 @@
* memory for the new task.
*
* Input Parameters:
* envsize - The size (in bytes) of the address environment needed by the
* task.
* textsize - The size (in bytes) of the .text address environment needed
* by the task. This region may be read/execute only.
* datasize - The size (in bytes) of the .data/.bss address environment
* needed by the task. This region may be read/write only.
* addrenv - The location to return the representation of the task address
* environment.
*
@ -112,7 +117,8 @@
*
****************************************************************************/
int up_addrenv_create(size_t envsize, FAR group_addrenv_t *addrenv)
int up_addrenv_create(size_t textsize, size_t datasize,
FAR group_addrenv_t *addrenv)
{
#warning Missing logic
return -ENOSYS;
@ -141,27 +147,62 @@ int up_addrenv_destroy(group_addrenv_t addrenv)
}
/****************************************************************************
* Name: up_addrenv_vaddr
* Name: up_addrenv_vtext
*
* Description:
* Return the virtual address associated with the newly create address
* environment. This function is used by the binary loaders in order
* get an address that can be used to initialize the new task.
* Return the virtual address associated with the newly create .text
* address environment. This function is used by the binary loaders in
* order get an address that can be used to initialize the new task.
*
* Input Parameters:
* addrenv - The representation of the task address environment previously
* returned by up_addrenv_create.
* vaddr - The location to return the virtual address.
* vtext - The location to return the virtual address.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int up_addrenv_vaddr(FAR group_addrenv_t addrenv, FAR void **vaddr)
int up_addrenv_vtext(FAR group_addrenv_t addrenv, FAR void **vtext)
{
#warning Missing logic
return -ENOSYS;
/* Not much to do in this case */
DEBUGASSERT(addrenv && vtext);
*vtext = (FAR void *)CONFIG_ARCH_TEXT_VBASE;
return OK;
}
/****************************************************************************
* Name: up_addrenv_vdata
*
* Description:
* Return the virtual address associated with the newly create .text
* address environment. This function is used by the binary loaders in
* order get an address that can be used to initialize the new task.
*
* Input Parameters:
* addrenv - The representation of the task address environment previously
* returned by up_addrenv_create.
* textsize - For some implementations, the text and data will be saved
* in the same memory region (read/write/execute) and, in this case,
* the virtual address of the data just lies at this offset into the
* common region.
* vdata - The location to return the virtual address.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int up_addrenv_vdata(FAR group_addrenv_t addrenv, uintptr_t textsize,
FAR void **vdata)
{
/* Not much to do in this case */
DEBUGASSERT(addrenv && vdata);
*vdata = (FAR void *)CONFIG_ARCH_DATA_VBASE;
return OK;
}
/****************************************************************************
@ -181,8 +222,8 @@ int up_addrenv_vaddr(FAR group_addrenv_t addrenv, FAR void **vaddr)
* The address environment that was in place before up_addrenv_select().
* This may be used with up_addrenv_restore() to restore the original
* address environment that was in place before up_addrenv_select() was
* called. Note that this may be a task agnostic, hardware
* representation that is different from group_addrenv_t.
* called. Note that this may be a task agnostic, platform-specific
* representation that may or may not be different from group_addrenv_t.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
@ -204,7 +245,7 @@ int up_addrenv_select(group_addrenv_t addrenv, save_addrenv_t *oldenv)
* original address environment.
*
* Input Parameters:
* oldenv - The hardware representation of the address environment
* oldenv - The platform-specific representation of the address environment
* previously returned by up_addrenv_select.
*
* Returned Value:
@ -234,10 +275,15 @@ int up_addrenv_restore(save_addrenv_t oldenv)
*
****************************************************************************/
int up_addrenv_assign(group_addrenv_t addrenv, FAR struct task_group_s *group)
int up_addrenv_assign(FAR const group_addrenv_t *addrenv,
FAR struct task_group_s *group)
{
#warning Missing logic
return -ENOSYS;
DEBUGASSERT(addrenv && group);
/* Just copy the addess environment into the group */
memcpy(&group->addrenv, addrenv, sizeof(group_addrenv_t));
return OK;
}
/****************************************************************************
@ -263,8 +309,9 @@ int up_addrenv_assign(group_addrenv_t addrenv, FAR struct task_group_s *group)
int up_addrenv_attach(FAR struct task_group_s *group, FAR struct tcb_s *tcb)
{
#warning Missing logic
return -ENOSYS;
/* Nothing needs to be done in this implementation */
return OK;
}
/****************************************************************************
@ -293,8 +340,9 @@ int up_addrenv_attach(FAR struct task_group_s *group, FAR struct tcb_s *tcb)
int up_addrenv_detach(FAR struct task_group_s *group, FAR struct tcb_s *tcb)
{
#warning Missing logic
return -ENOSYS;
/* Nothing needs to be done in this implementation */
return OK;
}
#endif /* CONFIG_ARCH_ADDRENV */

64
arch/z80/src/z180/z180_mmu.c
View File

@ -186,8 +186,10 @@ return g_physhandle ? OK : -ENOMEM;
*
* up_addrenv_create - Create an address environment
* up_addrenv_destroy - Destroy an address environment.
* up_addrenv_vaddr - Returns the virtual base address of the address
* environment
* up_addrenv_vtext - Returns the virtual base address of the .text
* address environment
* up_addrenv_vdata - Returns the virtual base address of the .bss/.data
* address environment
* up_addrenv_select - Instantiate an address environment
* up_addrenv_restore - Restore an address environment
* up_addrenv_assign - Assign an address environment to a group
@ -214,8 +216,10 @@ return g_physhandle ? OK : -ENOMEM;
* memory for the new task.
*
* Input Parameters:
* envsize - The size (in bytes) of the address environment needed by the
* task.
* textsize - The size (in bytes) of the .text address environment needed
* by the task. This region may be read/execute only.
* datasize - The size (in bytes) of the .data/.bss address environment
* needed by the task. This region may be read/write only.
* addrenv - The location to return the representation of the task address
* environment.
*
@ -224,17 +228,20 @@ return g_physhandle ? OK : -ENOMEM;
*
****************************************************************************/
int up_addrenv_create(size_t envsize, FAR group_addrenv_t *addrenv)
int up_addrenv_create(size_t textsize, size_t datasize,
FAR group_addrenv_t *addrenv)
{
FAR struct z180_cbr_s *cbr;
irqstate_t flags;
size_t envsize;
uintptr_t alloc;
unsigned int npages;
int ret;
/* Convert the size from bytes to numbers of pages */
npages = PHYS_ALIGNUP(envsize);
envsize = textsize + datasize;
npages = PHYS_ALIGNUP(envsize);
if (npages < 1)
{
/* No address environment... but I suppose that is not an error */
@ -331,28 +338,56 @@ int up_addrenv_destroy(group_addrenv_t addrenv)
}
/****************************************************************************
* Name: up_addrenv_vaddr
* Name: up_addrenv_vtext
*
* Description:
* Return the virtual address associated with the newly create address
* environment. This function is used by the binary loaders in order
* get an address that can be used to initialize the new task..
* Return the virtual address associated with the newly create .text
* address environment. This function is used by the binary loaders in
* order get an address that can be used to initialize the new task.
*
* Input Parameters:
* addrenv - The representation of the task address environment previously
* returned by up_addrenv_create.
* vaddr - The location to return the virtual address.
* vtext - The location to return the virtual address.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int up_addrenv_vaddr(FAR group_addrenv_t addrenv, FAR void **vaddr)
int up_addrenv_vtext(FAR group_addrenv_t addrenv, FAR void **vtext)
{
return CONFIG_Z180_COMMON1AREA_VIRTBASE;
}
/****************************************************************************
* Name: up_addrenv_vdata
*
* Description:
* Return the virtual address associated with the newly create .text
* address environment. This function is used by the binary loaders in
* order get an address that can be used to initialize the new task.
*
* Input Parameters:
* addrenv - The representation of the task address environment previously
* returned by up_addrenv_create.
* textsize - For some implementations, the text and data will be saved
* in the same memory region (read/write/execute) and, in this case,
* the virtual address of the data just lies at this offset into the
* common region.
* vdata - The location to return the virtual address.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int up_addrenv_vdata(FAR group_addrenv_t addrenv, uintptr_t textsize,
FAR void **vdata)
{
return CONFIG_Z180_COMMON1AREA_VIRTBASE + textsize;
}
/****************************************************************************
* Name: up_addrenv_select
*
@ -436,7 +471,8 @@ int up_addrenv_restore(save_addrenv_t oldenv)
*
****************************************************************************/
int up_addrenv_assign(group_addrenv_t addrenv, FAR struct task_group_s *group)
int up_addrenv_assign(FAR const group_addrenv_t *addrenv,
FAR struct task_group_s *group)
{
/* Make sure that there is no address environment in place on this TCB */
@ -446,7 +482,7 @@ int up_addrenv_assign(group_addrenv_t addrenv, FAR struct task_group_s *group)
* special precautions should be needed.
*/
group->addrenv = addrenv;
group->addrenv = *addrenv;
return OK;
}