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68 lines
1.4 KiB
68 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <errno.h> |
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#include <linux/unistd.h> |
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#include <sys/ptrace.h> |
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#include <sys/syscall.h> |
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#include <unistd.h> |
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#include <sysdep/tls.h> |
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#ifndef PTRACE_GET_THREAD_AREA |
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#define PTRACE_GET_THREAD_AREA 25 |
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#endif |
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#ifndef PTRACE_SET_THREAD_AREA |
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#define PTRACE_SET_THREAD_AREA 26 |
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#endif |
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/* Checks whether host supports TLS, and sets *tls_min according to the value |
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* valid on the host. |
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* i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */ |
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void check_host_supports_tls(int *supports_tls, int *tls_min) |
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{ |
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/* Values for x86 and x86_64.*/ |
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int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64}; |
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int i; |
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for (i = 0; i < ARRAY_SIZE(val); i++) { |
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user_desc_t info; |
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info.entry_number = val[i]; |
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if (syscall(__NR_get_thread_area, &info) == 0) { |
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*tls_min = val[i]; |
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*supports_tls = 1; |
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return; |
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} else { |
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if (errno == EINVAL) |
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continue; |
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else if (errno == ENOSYS) |
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*supports_tls = 0; |
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return; |
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} |
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} |
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*supports_tls = 0; |
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} |
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int os_set_thread_area(user_desc_t *info, int pid) |
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{ |
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int ret; |
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ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number, |
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(unsigned long) info); |
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if (ret < 0) |
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ret = -errno; |
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return ret; |
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} |
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int os_get_thread_area(user_desc_t *info, int pid) |
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{ |
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int ret; |
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ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number, |
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(unsigned long) info); |
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if (ret < 0) |
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ret = -errno; |
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return ret; |
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}
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