On Mon, Jan 28, 2013 at 9:23 AM, David Woodhouse dwmw2@infradead.org wrote:
From: David Woodhouse David.Woodhouse@intel.com
I want to do this too, and can't bring myself to introduce yet another copy.
Not-yet-signed-off-by: David Woodhouse David.Woodhouse@intel.com
would-be-acked-by: Marc Jones marc.jones@se-eng.com
src/entryfuncs.S | 74 ++++++++++++++++++++++---------------------------------- 1 file changed, 29 insertions(+), 45 deletions(-)
diff --git a/src/entryfuncs.S b/src/entryfuncs.S index afc5e61..ea6f990 100644 --- a/src/entryfuncs.S +++ b/src/entryfuncs.S @@ -9,6 +9,30 @@
- Entry macros
****************************************************************/
.macro PUSHBREGSpushl %eax // Save registers (matches struct bregs)pushl %ecxpushl %edxpushl %ebxpushl %ebppushl %esipushl %edipushw %espushw %ds.endm.macro POPBREGSpopw %ds // Restore registers (from struct bregs)popw %espopl %edipopl %esipopl %ebppopl %ebxpopl %edxpopl %ecxpopl %eax.endm// Call a C function - this does the minimal work necessary to // call into C. It sets up %ds, backs up %es, and backs up // those registers that are call clobbered by the C compiler.@@ -63,15 +87,7 @@ .macro ENTRY_ARG cfunc cli cld
pushl %eax // Save registers (matches struct bregs)pushl %ecxpushl %edxpushl %ebxpushl %ebppushl %esipushl %edipushw %espushw %ds
PUSHBREGS movw %ss, %ax // Move %ss to %ds movw %ax, %ds movl %esp, %ebx // Backup %esp, then zero high bits@@ -79,15 +95,7 @@ movl %esp, %eax // First arg is pointer to struct bregs calll \cfunc movl %ebx, %esp // Restore %esp (including high bits)
popw %ds // Restore registers (from struct bregs)popw %espopl %edipopl %esipopl %ebppopl %ebxpopl %edxpopl %ecxpopl %eax
POPBREGS .endm // As above, but get calling function from stack.@@ -111,43 +119,19 @@ movl %esp, %eax // First arg is pointer to struct bregs calll *%ecx movl %ebx, %esp // Restore %esp (including high bits)
popw %ds // Restore registers (from struct bregs)popw %espopl %edipopl %esipopl %ebppopl %ebxpopl %edxpopl %ecxpopl %eax
POPBREGS .endm // Same as ENTRY_ARG, but don't mangle %esp .macro ENTRY_ARG_ESP cfunc cli cld
pushl %eax // Save registers (matches struct bregs)pushl %ecxpushl %edxpushl %ebxpushl %ebppushl %esipushl %edipushw %espushw %ds
PUSHBREGS movw %ss, %ax // Move %ss to %ds movw %ax, %ds movl %esp, %eax // First arg is pointer to struct bregs calll \cfunc
popw %ds // Restore registers (from struct bregs)popw %espopl %edipopl %esipopl %ebppopl %ebxpopl %edxpopl %ecxpopl %eax
POPBREGS .endm // Reset stack, transition to 32bit mode, and call a C function.-- 1.8.0.2
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