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Commit 1c3eb629 authored by David Woodhouse's avatar David Woodhouse Committed by Paul Mackerras
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[PATCH] ppc: Make ARCH=ppc build again with new syscall path 

This makes ARCH=ppc build in your powerpc tree again, with the new
syscall entry/exit path.

Still doesn't actually boot on my Pegasos; the last thing I see is
'MMU:exit'. But at least it builds -- I'll look at why it doesn't boot
later, so that I can see if the mv643xx_eth actually works with ARCH=ppc
(it doesn't with ARCH=powerpc; two in every three packets I receive are
offset by 4 bytes).
Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent fb64c244
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Showing with 100 additions and 75 deletions
arch/ppc/kernel/asm-offsets.c
View file @ 1c3eb629
......@@ -131,7 +131,7 @@ main(void)
DEFINE(CPU_SPEC_FEATURES, offsetof(struct cpu_spec, cpu_features));
DEFINE(CPU_SPEC_SETUP, offsetof(struct cpu_spec, cpu_setup));
DEFINE(TI_SC_NOERR, offsetof(struct thread_info, syscall_noerror));
DEFINE(TI_SIGFRAME, offsetof(struct thread_info, nvgprs_frame));
DEFINE(TI_TASK, offsetof(struct thread_info, task));
DEFINE(TI_EXECDOMAIN, offsetof(struct thread_info, exec_domain));
DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
......
arch/ppc/kernel/entry.S
View file @ 1c3eb629
......@@ -200,8 +200,6 @@ _GLOBAL(DoSyscall)
bl do_show_syscall
#endif /* SHOW_SYSCALLS */
rlwinm r10,r1,0,0,18 /* current_thread_info() */
li r11,0
stb r11,TI_SC_NOERR(r10)
lwz r11,TI_FLAGS(r10)
andi. r11,r11,_TIF_SYSCALL_T_OR_A
bne- syscall_dotrace
......@@ -222,25 +220,21 @@ ret_from_syscall:
bl do_show_syscall_exit
#endif
mr r6,r3
li r11,-_LAST_ERRNO
cmplw 0,r3,r11
rlwinm r12,r1,0,0,18 /* current_thread_info() */
blt+ 30f
lbz r11,TI_SC_NOERR(r12)
cmpwi r11,0
bne 30f
neg r3,r3
lwz r10,_CCR(r1) /* Set SO bit in CR */
oris r10,r10,0x1000
stw r10,_CCR(r1)
/* disable interrupts so current_thread_info()->flags can't change */
30: LOAD_MSR_KERNEL(r10,MSR_KERNEL) /* doesn't include MSR_EE */
LOAD_MSR_KERNEL(r10,MSR_KERNEL) /* doesn't include MSR_EE */
SYNC
MTMSRD(r10)
lwz r9,TI_FLAGS(r12)
andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SIGPENDING|_TIF_NEED_RESCHED)
li r8,-_LAST_ERRNO
andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL)
bne- syscall_exit_work
cmplw 0,r3,r8
blt+ syscall_exit_cont
lwz r11,_CCR(r1) /* Load CR */
neg r3,r3
oris r11,r11,0x1000 /* Set SO bit in CR */
stw r11,_CCR(r1)
syscall_exit_cont:
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
/* If the process has its own DBCR0 value, load it up. The single
......@@ -292,46 +286,113 @@ syscall_dotrace:
b syscall_dotrace_cont
syscall_exit_work:
stw r6,RESULT(r1) /* Save result */
andi. r0,r9,_TIF_RESTOREALL
bne- 2f
cmplw 0,r3,r8
blt+ 1f
andi. r0,r9,_TIF_NOERROR
bne- 1f
lwz r11,_CCR(r1) /* Load CR */
neg r3,r3
oris r11,r11,0x1000 /* Set SO bit in CR */
stw r11,_CCR(r1)
1: stw r6,RESULT(r1) /* Save result */
stw r3,GPR3(r1) /* Update return value */
andi. r0,r9,_TIF_SYSCALL_T_OR_A
beq 5f
ori r10,r10,MSR_EE
SYNC
MTMSRD(r10) /* re-enable interrupts */
2: andi. r0,r9,(_TIF_PERSYSCALL_MASK)
beq 4f
/* Clear per-syscall TIF flags if any are set, but _leave_
_TIF_SAVE_NVGPRS set in r9 since we haven't dealt with that
yet. */
li r11,_TIF_PERSYSCALL_MASK
addi r12,r12,TI_FLAGS
3: lwarx r8,0,r12
andc r8,r8,r11
#ifdef CONFIG_IBM405_ERR77
dcbt 0,r12
#endif
stwcx. r8,0,r12
bne- 3b
subi r12,r12,TI_FLAGS
4: /* Anything which requires enabling interrupts? */
andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_SAVE_NVGPRS)
beq 7f
/* Save NVGPRS if they're not saved already */
lwz r4,TRAP(r1)
andi. r4,r4,1
beq 4f
beq 5f
SAVE_NVGPRS(r1)
li r4,0xc00
stw r4,TRAP(r1)
4:
/* Re-enable interrupts */
5: ori r10,r10,MSR_EE
SYNC
MTMSRD(r10)
andi. r0,r9,_TIF_SAVE_NVGPRS
bne save_user_nvgprs
save_user_nvgprs_cont:
andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP)
beq 7f
addi r3,r1,STACK_FRAME_OVERHEAD
bl do_syscall_trace_leave
REST_NVGPRS(r1)
2:
lwz r3,GPR3(r1)
6: lwz r3,GPR3(r1)
LOAD_MSR_KERNEL(r10,MSR_KERNEL) /* doesn't include MSR_EE */
SYNC
MTMSRD(r10) /* disable interrupts again */
rlwinm r12,r1,0,0,18 /* current_thread_info() */
lwz r9,TI_FLAGS(r12)
5:
7:
andi. r0,r9,_TIF_NEED_RESCHED
bne 1f
bne 8f
lwz r5,_MSR(r1)
andi. r5,r5,MSR_PR
beq syscall_exit_cont
beq ret_from_except
andi. r0,r9,_TIF_SIGPENDING
beq syscall_exit_cont
beq ret_from_except
b do_user_signal
1:
8:
ori r10,r10,MSR_EE
SYNC
MTMSRD(r10) /* re-enable interrupts */
bl schedule
b 2b
b 6b
save_user_nvgprs:
lwz r8,TI_SIGFRAME(r12)
.macro savewords start, end
1: stw \start,4*(\start)(r8)
.section __ex_table,"a"
.align 2
.long 1b,save_user_nvgprs_fault
.previous
.if \end - \start
savewords "(\start+1)",\end
.endif
.endm
savewords 14,31
b save_user_nvgprs_cont
save_user_nvgprs_fault:
li r3,11 /* SIGSEGV */
lwz r4,TI_TASK(r12)
bl force_sigsegv
rlwinm r12,r1,0,0,18 /* current_thread_info() */
lwz r9,TI_FLAGS(r12)
b save_user_nvgprs_cont
#ifdef SHOW_SYSCALLS
do_show_syscall:
#ifdef SHOW_SYSCALLS_TASK
......@@ -401,28 +462,10 @@ show_syscalls_task:
#endif /* SHOW_SYSCALLS */
/*
* The sigsuspend and rt_sigsuspend system calls can call do_signal
* and thus put the process into the stopped state where we might
* want to examine its user state with ptrace. Therefore we need
* to save all the nonvolatile registers (r13 - r31) before calling
* the C code.
* The fork/clone functions need to copy the full register set into
* the child process. Therefore we need to save all the nonvolatile
* registers (r13 - r31) before calling the C code.
*/
.globl ppc_sigsuspend
ppc_sigsuspend:
SAVE_NVGPRS(r1)
lwz r0,TRAP(r1)
rlwinm r0,r0,0,0,30 /* clear LSB to indicate full */
stw r0,TRAP(r1) /* register set saved */
b sys_sigsuspend
.globl ppc_rt_sigsuspend
ppc_rt_sigsuspend:
SAVE_NVGPRS(r1)
lwz r0,TRAP(r1)
rlwinm r0,r0,0,0,30
stw r0,TRAP(r1)
b sys_rt_sigsuspend
.globl ppc_fork
ppc_fork:
SAVE_NVGPRS(r1)
......@@ -447,14 +490,6 @@ ppc_clone:
stw r0,TRAP(r1) /* register set saved */
b sys_clone
.globl ppc_swapcontext
ppc_swapcontext:
SAVE_NVGPRS(r1)
lwz r0,TRAP(r1)
rlwinm r0,r0,0,0,30 /* clear LSB to indicate full */
stw r0,TRAP(r1) /* register set saved */
b sys_swapcontext
/*
* Top-level page fault handling.
* This is in assembler because if do_page_fault tells us that
......@@ -626,16 +661,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_601)
.long ret_from_except
#endif
.globl sigreturn_exit
sigreturn_exit:
subi r1,r3,STACK_FRAME_OVERHEAD
rlwinm r12,r1,0,0,18 /* current_thread_info() */
lwz r9,TI_FLAGS(r12)
andi. r0,r9,_TIF_SYSCALL_T_OR_A
beq+ ret_from_except_full
bl do_syscall_trace_leave
/* fall through */
.globl ret_from_except_full
ret_from_except_full:
REST_NVGPRS(r1)
......@@ -658,7 +683,7 @@ user_exc_return: /* r10 contains MSR_KERNEL here */
/* Check current_thread_info()->flags */
rlwinm r9,r1,0,0,18
lwz r9,TI_FLAGS(r9)
andi. r0,r9,(_TIF_SIGPENDING|_TIF_NEED_RESCHED)
andi. r0,r9,(_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_RESTOREALL)
bne do_work
restore_user:
......
arch/ppc/kernel/misc.S
View file @ 1c3eb629
......@@ -1197,7 +1197,7 @@ _GLOBAL(sys_call_table)
.long sys_ssetmask
.long sys_setreuid /* 70 */
.long sys_setregid
.long ppc_sigsuspend
.long sys_sigsuspend
.long sys_sigpending
.long sys_sethostname
.long sys_setrlimit /* 75 */
......@@ -1303,7 +1303,7 @@ _GLOBAL(sys_call_table)
.long sys_rt_sigpending /* 175 */
.long sys_rt_sigtimedwait
.long sys_rt_sigqueueinfo
.long ppc_rt_sigsuspend
.long sys_rt_sigsuspend
.long sys_pread64
.long sys_pwrite64 /* 180 */
.long sys_chown
......@@ -1374,7 +1374,7 @@ _GLOBAL(sys_call_table)
.long sys_clock_gettime
.long sys_clock_getres
.long sys_clock_nanosleep
.long ppc_swapcontext
.long sys_swapcontext
.long sys_tgkill /* 250 */
.long sys_utimes
.long sys_statfs64
......
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