diff options
Diffstat (limited to 'config/solaris/sparc.c')
-rw-r--r-- | config/solaris/sparc.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/config/solaris/sparc.c b/config/solaris/sparc.c new file mode 100644 index 0000000..6c57a94 --- /dev/null +++ b/config/solaris/sparc.c @@ -0,0 +1,39 @@ +/* + * coswitch for Sun-4 Sparc. + * + * Compile this with 'gcc -c rswitch.c'. Do not use gcc -O. + */ + +#include <sys/asm_linkage.h> +#include <sys/trap.h> + +int coswitch(old_cs, new_cs, first) +int *old_cs, *new_cs; +int first; +{ + asm("ta 0x03"); /* ST_FLUSH_WINDOWS in trap.h */ + asm("ld [%fp+0x44], %o0"); /* load old_cs into %o0 */ + asm("st %sp,[%o0]"); /* Save user stack pointer */ + asm("st %fp,[%o0+0x4]"); /* Save frame pointer */ + asm("st %i7,[%o0+0x8]"); /* Save return address */ + + if (first == 0) { /* this is the first activation */ + asm("ld [%fp+0x48], %o0"); /* load new_cs into %o0 */ + asm("ld [%o0], %o1"); /* load %o1 from cstate[0] */ + + /* Decrement new stack pointer value before loading it into sp. */ + /* The top 64 bytes of the stack are reserved for the kernel, to */ + /* save the 8 local and 8 in registers into, on context switches, */ + /* interrupts, traps, etc. */ + + asm("save %o1,-96, %sp"); /* load %sp from %o1 */ + new_context(0,0); + syserr("new_context() returned in coswitch"); + + } else { + asm("ld [%fp+0x48], %o0"); /* load new_cs into %o0 */ + asm("ld [%o0+0x4],%fp"); /* Load frame pointer */ + asm("ld [%o0+0x8],%i7"); /* Load return address */ + asm("ld [%o0],%sp"); /* Load user stack pointer */ + } +} |