Christian Hesse <l...@eworm.de> on Tue, 2013/04/02 10:35: > Hello everybody, > > with gcc 4.8.0 compilation fails: > > With [BUILD] bin/pxe_call.o > arch/i386/interface/pxe/pxe_call.c: In function ‘pxe_start_nbp’: > arch/i386/interface/pxe/pxe_call.c:284:1: error: bp cannot be used in asm > here } > ^ > > No idea how to fix this, though.
Oh, this has been reported before... Sorry.
But I have a patch. Compiles and works for me [tm], hope it is correct.
--
main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH"
"CX:;",b;for(a/* Chris get my mail address: */=0;b=c[a++];)
putchar(b-1/(/* gcc -o sig sig.c && ./sig */b/42*2-3)*42);}
diff --git a/src/arch/i386/interface/pxe/pxe_call.c b/src/arch/i386/interface/pxe/pxe_call.c
index b8e73a0..5f8ed07 100644
--- a/src/arch/i386/interface/pxe/pxe_call.c
+++ b/src/arch/i386/interface/pxe/pxe_call.c
@@ -265,12 +265,14 @@ int pxe_start_nbp ( void ) {
DBG ( "Restarting NBP (%x)\n", jmp );
/* Far call to PXE NBP */
- __asm__ __volatile__ ( REAL_CODE ( "movw %%cx, %%es\n\t"
+ __asm__ __volatile__ ( REAL_CODE ( "pushl %%ebp\n\t"
+ "movw %%cx, %%es\n\t"
"pushw %%es\n\t"
"pushw %%di\n\t"
"sti\n\t"
"lcall $0, $0x7c00\n\t"
- "addw $4, %%sp\n\t" )
+ "addw $4, %%sp\n\t"
+ "popl %%ebp\n\t" )
: "=a" ( rc ), "=b" ( discard_b ),
"=c" ( discard_c ), "=d" ( discard_d ),
"=D" ( discard_D )
@@ -278,7 +280,7 @@ int pxe_start_nbp ( void ) {
"c" ( rm_cs ),
"d" ( virt_to_phys ( &pxenv ) ),
"D" ( __from_text16 ( &ppxe ) )
- : "esi", "ebp", "memory" );
+ : "esi", "memory" );
return rc;
}
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