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linux-user/arm: Do not allocate a commpage at all for M-profile CPUs

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Since commit fbd3c4cff6 ("linux-user/arm: Mark the commpage
executable") executing bare-metal (linked with rdimon.specs)
cortex-M code fails as:

  $ qemu-arm -cpu cortex-m3 ~/hello.exe.m3
  qemu-arm: ../../accel/tcg/user-exec.c:492: page_set_flags: Assertion `last <= GUEST_ADDR_MAX' failed.
  Aborted (core dumped)

Commit 4f5c67f8df ("linux-user/arm: Take more care allocating
commpage") already took care of not allocating a commpage for
M-profile CPUs, however it had to be reverted as commit 6cda41daa2.

Re-introduce the M-profile fix from commit 4f5c67f8df.

Fixes: fbd3c4cff6 ("linux-user/arm: Mark the commpage executable")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1755
Reported-by: Christophe Lyon <christophe.lyon@linaro.org>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230711153408.68389-1-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2023-07-11 17:34:08 +02:00 committed by Richard Henderson
parent ac42f44310
commit d713cf4d6c
1 changed files with 17 additions and 4 deletions
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21
linux-user/elfload.c
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@ -424,10 +424,23 @@ enum {
static bool init_guest_commpage(void)
{
abi_ptr commpage = HI_COMMPAGE & -qemu_host_page_size;
void *want = g2h_untagged(commpage);
void *addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
ARMCPU *cpu = ARM_CPU(thread_cpu);
abi_ptr commpage;
void *want;
void *addr;
/*
* M-profile allocates maximum of 2GB address space, so can never
* allocate the commpage. Skip it.
*/
if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
return true;
}
commpage = HI_COMMPAGE & -qemu_host_page_size;
want = g2h_untagged(commpage);
addr = mmap(want, qemu_host_page_size, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0);
if (addr == MAP_FAILED) {
perror("Allocating guest commpage");