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| author | Andrew Cooper <andrew.cooper3@citrix.com> | 2013-08-27 11:28:26 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2013-08-27 11:28:26 +0200 |
| commit | 8a3c4acc9907cfec9aae9f1bc251fbf50af6828e (patch) | |
| tree | 3e93a1da7124e4538579b65a894106e9ba0e01e0 /xen/arch/x86/boot/x86_64.S | |
| parent | 483814219bc4d47db8a56116290ec7878b794c09 (diff) | |
| download | xen-8a3c4acc9907cfec9aae9f1bc251fbf50af6828e.tar.gz xen-8a3c4acc9907cfec9aae9f1bc251fbf50af6828e.tar.bz2 xen-8a3c4acc9907cfec9aae9f1bc251fbf50af6828e.zip | |
x86/boot: Explicitly clean pcpu stacks in debug builds
This reduces confusion when looking at a hexdump of the pcpu stacks and
wondering were on earth some of the junk was coming from. Also leave some
grep fodder for finding where the BSP switches stack (because it took me
far longer to find than I care to admit to).
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Diffstat (limited to 'xen/arch/x86/boot/x86_64.S')
| -rw-r--r-- | xen/arch/x86/boot/x86_64.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/xen/arch/x86/boot/x86_64.S b/xen/arch/x86/boot/x86_64.S index ed3888d469..399541d19a 100644 --- a/xen/arch/x86/boot/x86_64.S +++ b/xen/arch/x86/boot/x86_64.S @@ -13,6 +13,15 @@ mov mmu_cr4_features(%rip),%rcx mov %rcx,%cr4 +#ifndef NDEBUG + /* Clean stack. */ + mov stack_start(%rip),%rdi + mov $(STACK_SIZE / 8),%rcx + xor %eax,%eax + rep stosq +#endif + + /* Switch to cpu0_stack. */ mov stack_start(%rip),%rsp or $(STACK_SIZE-CPUINFO_sizeof),%rsp |