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arch: ppc64: now working

master
William Pitcock 2018-02-06 08:05:53 +00:00
parent 9e5aba6b48
commit 71979e9cf6
4 changed files with 23 additions and 11 deletions
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1
README.md
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@ -21,3 +21,4 @@ Right now these archs are supported and should work on bare metal:
These archs require kernel assistance and use a syscall (the only assembly is the trampoline):
* ppc
* ppc64 (ELFv2 ABI spec only, ELFv1 not supported)

5
arch/ppc64/defs.h
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@ -56,7 +56,10 @@
/* nip register is actually %srr0 (r32) */
#define REG_NIP REG_R32
/* lnk register is actually r32 */
/* entry register is actually %r12 */
#define REG_ENTRY REG_R12
/* lnk register is actually %r36 */
#define REG_LNK REG_R36
#endif

9
arch/ppc64/makecontext.c
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@ -39,10 +39,11 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
sp -= (uc_link + 1);
sp = (greg_t *) (((uintptr_t) sp & -16L));
ucp->uc_mcontext.gp_regs[REG_NIP] = (uintptr_t) func;
ucp->uc_mcontext.gp_regs[REG_LNK] = (uintptr_t) &__start_context;
ucp->uc_mcontext.gp_regs[REG_R31] = (uintptr_t) ucp->uc_link;
ucp->uc_mcontext.gp_regs[REG_SP] = (uintptr_t) sp;
ucp->uc_mcontext.gp_regs[REG_NIP] = (uintptr_t) func;
ucp->uc_mcontext.gp_regs[REG_LNK] = (uintptr_t) &__start_context;
ucp->uc_mcontext.gp_regs[REG_SP] = (uintptr_t) sp;
ucp->uc_mcontext.gp_regs[REG_ENTRY] = (uintptr_t) func;
ucp->uc_mcontext.gp_regs[REG_R31] = (uintptr_t) ucp->uc_link;
sp[0] = (uintptr_t) &__start_context;
sp[uc_link] = (uintptr_t) ucp->uc_link;

19
arch/ppc64/startcontext.S
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@ -13,12 +13,19 @@
.globl __start_context;
.hidden __start_context;
__start_context:
/* get the proper context into position and test for NULL */
mr. 3,31
beq hosed
bl __setcontext
nop
cmpdi 31,0 /* test if ucontext link pointer is null */
beq do_exit /* if it is, exit */
hosed:
/* now, call SYS_swapcontext */
mr 4,31 /* ucp is in r31 */
li 3,0 /* don't care about restoring, set oucp to NULL */
li 5,1696 /* sizeof(ucontext_t) */
li 0,249 /* SYS_swapcontext */
sc
/* we should not wind back up here, if we do, exit with -1 */
li 3,-1
do_exit:
b exit@GOT
nop