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Wrote the bits that would fill in arg/env info to first page of task stack.

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This commit is contained in:
Bahadir Balban
2008-02-28 00:40:43 +00:00
parent e7b0e46065
commit 5b7bb88008
3 changed files with 20 additions and 5 deletions
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17
tasks/mm0/src/fault.c
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@@ -258,6 +258,20 @@ int is_env_arg_page(struct fault_data *fault)
return fault->address >= page_align(fault->task->stack_end);
}
int fill_env_arg_info(struct fault_data *fault, void *vaddr)
{
/* Get the env start offset in the page */
unsigned long env_offset = fault->task->env_start & PAGE_MASK;
/* Write the environment information */
*(unsigned long *)(vaddr + env_offset) = fault->task->utcb_address;
printf("%s: Written env value 0x%x, to task address 0x%x\n",
__TASKNAME__, fault->task->utcb_address,
page_align(fault->address) + env_offset);
return 0;
}
/*
* Handles any page allocation or file ownership change for anonymous pages.
* For read accesses initialises a wired-in zero page and for write accesses
@@ -319,8 +333,9 @@ int do_anon_page(struct fault_data *fault)
/* Clear the page */
memset((void *)vaddr, 0, PAGE_SIZE);
/* If its the env/arg page on stack, fill that information */
if (is_env_arg_page(fault))
/* TODO: Fill in environment information here. */
fill_env_arg_info(fault, vaddr);
/* Remove temporary mapping */
l4_unmap((void *)vaddr, 1, self_tid());