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https://github.com/qemu/qemu.git
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f55fc1c092
Expand the interface of page_set_flags to separate the set of flags to be set and the set of flags to be cleared. This allows us to replace PAGE_RESET with the PAGE_VALID bit within clear_flags. Replace PAGE_TARGET_STICKY with TARGET_PAGE_NOTSTICKY; aarch64-linux-user is the only user. Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
48 lines
1.3 KiB
C
48 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "loader.h"
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#include "target_elf.h"
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const char *get_elf_cpu_model(uint32_t eflags)
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{
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return "hppa";
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}
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const char *get_elf_platform(CPUState *cs)
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{
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return "PARISC";
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}
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bool init_guest_commpage(void)
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{
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/* If reserved_va, then we have already mapped 0 page on the host. */
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if (!reserved_va) {
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void *want, *addr;
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want = g2h_untagged(LO_COMMPAGE);
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addr = mmap(want, TARGET_PAGE_SIZE, PROT_NONE,
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MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED_NOREPLACE, -1, 0);
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if (addr == MAP_FAILED) {
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perror("Allocating guest commpage");
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exit(EXIT_FAILURE);
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}
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if (addr != want) {
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return false;
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}
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}
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/*
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* On Linux, page zero is normally marked execute only + gateway.
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* Normal read or write is supposed to fail (thus PROT_NONE above),
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* but specific offsets have kernel code mapped to raise permissions
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* and implement syscalls. Here, simply mark the page executable.
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* Special case the entry points during translation (see do_page_zero).
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*/
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page_set_flags(LO_COMMPAGE, LO_COMMPAGE | ~TARGET_PAGE_MASK,
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PAGE_EXEC | PAGE_VALID, PAGE_VALID);
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return true;
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}
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