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print kernel stacktrace for exceptions in kernel

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fpu alignment check feature, checksum feature
This commit is contained in:
Ben Gras
2011-07-21 00:48:35 +02:00
parent 7ee78ffb82
commit eff1369cab
11 changed files with 59 additions and 11 deletions
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40
kernel/arch/i386/arch_system.c
View File

@@ -58,6 +58,27 @@ FORWARD _PROTOTYPE( void ser_dump_proc_cpu, (void));
FORWARD _PROTOTYPE( void ser_init, (void));
#endif
PRIVATE u32_t fpusum(struct proc *p)
{
void *save_area = p->p_fpu_state.fpu_save_area_p;
return crc32(0, save_area, FPU_XFP_SIZE);
}
PUBLIC void fpu_makechecksum(struct proc *p)
{
p->p_fpu_state.checksum = fpusum(p);
}
PUBLIC void fpu_verifychecksum(struct proc *p)
{
static int n;
n++;
if(p->p_fpu_state.checksum != fpusum(p)) {
printf("%d / %s fpu state broken!", p->p_endpoint, p->p_name);
util_stacktrace();
}
}
PUBLIC __dead void arch_monitor(void)
{
monitor();
@@ -252,16 +273,23 @@ PUBLIC void fpu_init(void)
PUBLIC void save_local_fpu(struct proc *pr)
{
static int n;
phys_bytes save_area = (phys_bytes) pr->p_fpu_state.fpu_save_area_p;
if(!is_fpu())
return;
/* save area must be 16-byte aligned */
assert(!(save_area % FPUALIGN));
/* Save changed FPU context. */
if(osfxsr_feature) {
fxsave(pr->p_fpu_state.fpu_save_area_p);
fxsave(save_area);
fninit();
} else {
fnsave(pr->p_fpu_state.fpu_save_area_p);
fnsave(save_area);
}
fpu_makechecksum(pr);
}
PUBLIC void save_fpu(struct proc *pr)
@@ -304,10 +332,14 @@ PUBLIC void restore_fpu(struct proc *pr)
fninit();
pr->p_misc_flags |= MF_FPU_INITIALIZED;
} else {
phys_bytes save_area = (phys_bytes) pr->p_fpu_state.fpu_save_area_p;
/* save area must be 16-byte aligned */
assert(!(save_area % FPUALIGN));
fpu_verifychecksum(pr);
if(osfxsr_feature) {
fxrstor(pr->p_fpu_state.fpu_save_area_p);
fxrstor(save_area);
} else {
frstor(pr->p_fpu_state.fpu_save_area_p);
frstor(save_area);
}
}
}

8
kernel/arch/i386/include/arch_proto.h
View File

@@ -95,10 +95,10 @@ _PROTOTYPE( void ia32_msr_read, (u32_t reg, u32_t * hi, u32_t * lo) );
_PROTOTYPE( void ia32_msr_write, (u32_t reg, u32_t hi, u32_t lo) );
_PROTOTYPE( void fninit, (void));
_PROTOTYPE( void clts, (void));
_PROTOTYPE( void fxsave, (void *));
_PROTOTYPE( void fnsave, (void *));
_PROTOTYPE( void fxrstor, (void *));
_PROTOTYPE( void frstor, (void *));
_PROTOTYPE( void fxsave, (vir_bytes));
_PROTOTYPE( void fnsave, (vir_bytes));
_PROTOTYPE( void fxrstor, (vir_bytes));
_PROTOTYPE( void frstor, (vir_bytes));
_PROTOTYPE( unsigned short fnstsw, (void));
_PROTOTYPE( void fnstcw, (unsigned short* cw));

2
kernel/arch/i386/sconst.h
View File

@@ -28,7 +28,7 @@
SSREG = SPREG+W
P_STACKTOP = SSREG+W
FP_SAVE_AREA_P = P_STACKTOP
P_LDT_SEL = FP_SAVE_AREA_P + 532
P_LDT_SEL = FP_SAVE_AREA_P + 536
P_CR3 = P_LDT_SEL+W
P_CR3_V = P_CR3+4
P_LDT = P_CR3_V+W