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powerpc: trap_is_syscall() helper to hide syscall trap number

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A new system call interrupt will be added with a new trap number.
Hide the explicit 0xc00 test behind an accessor to reduce churn
in callers.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Make it a static inline]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200507121332.2233629-3-mpe@ellerman.id.au
This commit is contained in:
Nicholas Piggin 2020-05-07 22:13:31 +10:00 committed by Michael Ellerman
parent db30144b5c
commit 912237ea16
5 changed files with 12 additions and 4 deletions
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5
arch/powerpc/include/asm/ptrace.h
View File

@ -222,6 +222,11 @@ static inline void set_trap(struct pt_regs *regs, unsigned long val)
regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);
}
static inline bool trap_is_syscall(struct pt_regs *regs)
{
return TRAP(regs) == 0xc00;
}
#define arch_has_single_step() (1)
#ifndef CONFIG_BOOK3S_601
#define arch_has_block_step() (true)

5
arch/powerpc/include/asm/syscall.h
View File

@ -26,7 +26,10 @@ static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
* This is important for seccomp so that compat tasks can set r0 = -1
* to reject the syscall.
*/
return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1;
if (trap_is_syscall(regs))
return regs->gpr[0];
else
return -1;
}
static inline void syscall_rollback(struct task_struct *task,

2
arch/powerpc/kernel/process.c
View File

@ -1413,7 +1413,7 @@ void show_regs(struct pt_regs * regs)
print_msr_bits(regs->msr);
pr_cont(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer);
trap = TRAP(regs);
if ((TRAP(regs) != 0xc00) && cpu_has_feature(CPU_FTR_CFAR))
if (!trap_is_syscall(regs) && cpu_has_feature(CPU_FTR_CFAR))
pr_cont("CFAR: "REG" ", regs->orig_gpr3);
if (trap == 0x200 || trap == 0x300 || trap == 0x600)
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)

2
arch/powerpc/kernel/signal.c
View File

@ -198,7 +198,7 @@ static void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
int restart = 1;
/* syscall ? */
if (TRAP(regs) != 0x0C00)
if (!trap_is_syscall(regs))
return;
/* error signalled ? */

2
arch/powerpc/xmon/xmon.c
View File

@ -1776,7 +1776,7 @@ static void prregs(struct pt_regs *fp)
#endif
printf("pc = ");
xmon_print_symbol(fp->nip, " ", "\n");
if (TRAP(fp) != 0xc00 && cpu_has_feature(CPU_FTR_CFAR)) {
if (!trap_is_syscall(fp) && cpu_has_feature(CPU_FTR_CFAR)) {
printf("cfar= ");
xmon_print_symbol(fp->orig_gpr3, " ", "\n");
}