arch/mips/kernel/signal32.c
Source file repositories/reference/linux-study-clean/arch/mips/kernel/signal32.c
File Facts
- System
- Linux kernel
- Corpus path
arch/mips/kernel/signal32.c- Extension
.c- Size
- 2109 bytes
- Lines
- 80
- Domain
- Architecture Layer
- Bucket
- arch/mips
- Inferred role
- Architecture Layer: syscall or user/kernel boundary
- Status
- core implementation candidate
Why This File Exists
CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
- Defines or participates in a user/kernel boundary; inspect argument validation, copy_from_user/copy_to_user, credentials, and dispatch target.
- Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/compat.hlinux/compiler.hlinux/errno.hlinux/kernel.hlinux/signal.hlinux/syscalls.hasm/compat-signal.hlinux/uaccess.hasm/unistd.hasm/syscalls.hsignal-common.h
Detected Declarations
function sys32_sigsuspend
Annotated Snippet
SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
struct compat_sigaction __user *, oact)
{
struct k_sigaction new_ka, old_ka;
int ret;
int err = 0;
if (act) {
old_sigset_t mask;
s32 handler;
if (!access_ok(act, sizeof(*act)))
return -EFAULT;
err |= __get_user(handler, &act->sa_handler);
new_ka.sa.sa_handler = (void __user *)(s64)handler;
err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
err |= __get_user(mask, &act->sa_mask.sig[0]);
if (err)
return -EFAULT;
siginitset(&new_ka.sa.sa_mask, mask);
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
if (!access_ok(oact, sizeof(*oact)))
return -EFAULT;
err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
&oact->sa_handler);
err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
err |= __put_user(0, &oact->sa_mask.sig[1]);
err |= __put_user(0, &oact->sa_mask.sig[2]);
err |= __put_user(0, &oact->sa_mask.sig[3]);
if (err)
return -EFAULT;
}
return ret;
}
Annotation
- Immediate include surface: `linux/compat.h`, `linux/compiler.h`, `linux/errno.h`, `linux/kernel.h`, `linux/signal.h`, `linux/syscalls.h`, `asm/compat-signal.h`, `linux/uaccess.h`.
- Detected declarations: `function sys32_sigsuspend`.
- Atlas domain: Architecture Layer / arch/mips.
- Implementation status: core implementation candidate.
- This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.