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This commit is contained in:
Simon Gardling
2024-09-10 13:03:02 -04:00
parent 53c617d779
commit d66450e427
381 changed files with 28864 additions and 34170 deletions
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79
kern/arch/mips/thread/switchframe.c
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@@ -37,7 +37,6 @@
/* in threadstart.S */
extern void mips_threadstart(/* arguments are in unusual registers */);
/*
* Function to initialize the switchframe of a new thread, which is
* *not* the one that is currently running.
@@ -51,48 +50,46 @@ extern void mips_threadstart(/* arguments are in unusual registers */);
* store the arguments in the s* registers, and use a bit of asm
* (mips_threadstart) to move them and then jump to thread_startup.
*/
void
switchframe_init(struct thread *thread,
void (*entrypoint)(void *data1, unsigned long data2),
void *data1, unsigned long data2)
{
vaddr_t stacktop;
struct switchframe *sf;
void switchframe_init(struct thread *thread,
void (*entrypoint)(void *data1, unsigned long data2),
void *data1, unsigned long data2) {
vaddr_t stacktop;
struct switchframe *sf;
/*
* MIPS stacks grow down. t_stack is just a hunk of memory, so
* get the other end of it. Then set up a switchframe on the
* top of the stack.
*/
stacktop = ((vaddr_t)thread->t_stack) + STACK_SIZE;
sf = ((struct switchframe *) stacktop) - 1;
/*
* MIPS stacks grow down. t_stack is just a hunk of memory, so
* get the other end of it. Then set up a switchframe on the
* top of the stack.
*/
stacktop = ((vaddr_t)thread->t_stack) + STACK_SIZE;
sf = ((struct switchframe *)stacktop) - 1;
/* Zero out the switchframe. */
bzero(sf, sizeof(*sf));
/* Zero out the switchframe. */
bzero(sf, sizeof(*sf));
/*
* Now set the important parts: pass through the three arguments,
* and set the return address register to the place we want
* execution to begin.
*
* Thus, when switchframe_switch does its "j ra", it will
* actually jump to mips_threadstart, which will move the
* arguments into the right register and jump to
* thread_startup().
*
* Note that this means that when we call switchframe_switch()
* in thread_switch(), we may not come back out the same way
* in the next thread. (Though we will come back out the same
* way when we later come back to the same thread again.)
*
* This has implications for code at the bottom of
* thread_switch, described in thread.c.
*/
sf->sf_s0 = (uint32_t)entrypoint;
sf->sf_s1 = (uint32_t)data1;
sf->sf_s2 = (uint32_t)data2;
sf->sf_ra = (uint32_t)mips_threadstart;
/*
* Now set the important parts: pass through the three arguments,
* and set the return address register to the place we want
* execution to begin.
*
* Thus, when switchframe_switch does its "j ra", it will
* actually jump to mips_threadstart, which will move the
* arguments into the right register and jump to
* thread_startup().
*
* Note that this means that when we call switchframe_switch()
* in thread_switch(), we may not come back out the same way
* in the next thread. (Though we will come back out the same
* way when we later come back to the same thread again.)
*
* This has implications for code at the bottom of
* thread_switch, described in thread.c.
*/
sf->sf_s0 = (uint32_t)entrypoint;
sf->sf_s1 = (uint32_t)data1;
sf->sf_s2 = (uint32_t)data2;
sf->sf_ra = (uint32_t)mips_threadstart;
/* Set ->t_context, and we're done. */
thread->t_context = sf;
/* Set ->t_context, and we're done. */
thread->t_context = sf;
}