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use linker to align fpu state save area

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This commit is contained in:
Ben Gras
2012-04-19 15:06:47 +02:00
parent 093c949274
commit a149be43fc
11 changed files with 45 additions and 81 deletions
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10
kernel/system/do_fork.c
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@@ -27,7 +27,7 @@ int do_fork(struct proc * caller, message * m_ptr)
/* Handle sys_fork(). PR_ENDPT has forked. The child is PR_SLOT. */
#if (_MINIX_CHIP == _CHIP_INTEL)
reg_t old_ldt_sel;
void *old_fpu_save_area_p;
char *old_fpu_save_area_p;
#endif
register struct proc *rpc; /* child process pointer */
struct proc *rpp; /* parent process pointer */
@@ -59,16 +59,14 @@ int do_fork(struct proc * caller, message * m_ptr)
gen = _ENDPOINT_G(rpc->p_endpoint);
#if (_MINIX_CHIP == _CHIP_INTEL)
old_ldt_sel = rpc->p_seg.p_ldt_sel; /* backup local descriptors */
old_fpu_save_area_p = rpc->p_fpu_state.fpu_save_area_p;
old_fpu_save_area_p = rpc->p_seg.fpu_state;
#endif
*rpc = *rpp; /* copy 'proc' struct */
#if (_MINIX_CHIP == _CHIP_INTEL)
rpc->p_seg.p_ldt_sel = old_ldt_sel; /* restore descriptors */
rpc->p_fpu_state.fpu_save_area_p = old_fpu_save_area_p;
rpc->p_seg.fpu_state = old_fpu_save_area_p;
if(proc_used_fpu(rpp))
memcpy(rpc->p_fpu_state.fpu_save_area_p,
rpp->p_fpu_state.fpu_save_area_p,
FPU_XFP_SIZE);
memcpy(rpc->p_seg.fpu_state, rpp->p_seg.fpu_state, FPU_XFP_SIZE);
#endif
if(++gen >= _ENDPOINT_MAX_GENERATION) /* increase generation */
gen = 1; /* generation number wraparound */