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um: print register names in wait_for_stub 

Since we're basically debugging the userspace (it runs in ptrace)
it's useful to dump out the registers - but they're not readable,
so if something goes wrong it's hard to say what. Print the names
of registers in the register dump so it's easier to look at.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Johannes Berg 2021-01-13 22:07:41 +01:00 committed by Richard Weinberger
parent a15f1e41fb
commit e1e22d0d91
1 changed files with 53 additions and 2 deletions
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55
arch/um/os-Linux/skas/process.c
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@ -28,6 +28,54 @@ int is_skas_winch(int pid, int fd, void *data)
return pid == getpgrp();
}
static const char *ptrace_reg_name(int idx)
{
#define R(n) case HOST_##n: return #n
switch (idx) {
#ifdef __x86_64__
R(BX);
R(CX);
R(DI);
R(SI);
R(DX);
R(BP);
R(AX);
R(R8);
R(R9);
R(R10);
R(R11);
R(R12);
R(R13);
R(R14);
R(R15);
R(ORIG_AX);
R(CS);
R(SS);
R(EFLAGS);
#elif defined(__i386__)
R(IP);
R(SP);
R(EFLAGS);
R(AX);
R(BX);
R(CX);
R(DX);
R(SI);
R(DI);
R(BP);
R(CS);
R(SS);
R(DS);
R(FS);
R(ES);
R(GS);
R(ORIG_AX);
#endif
}
return "";
}
static int ptrace_dump_regs(int pid)
{
unsigned long regs[MAX_REG_NR];
@ -37,8 +85,11 @@ static int ptrace_dump_regs(int pid)
return -errno;
printk(UM_KERN_ERR "Stub registers -\n");
for (i = 0; i < ARRAY_SIZE(regs); i++)
printk(UM_KERN_ERR "\t%d - %lx\n", i, regs[i]);
for (i = 0; i < ARRAY_SIZE(regs); i++) {
const char *regname = ptrace_reg_name(i);
printk(UM_KERN_ERR "\t%s\t(%2d): %lx\n", regname, i, regs[i]);
}
return 0;
}