motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-12-17 21:26:13 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

linux-user/hppa: Add signal trampoline for hppa target

Browse source 
In Linux kernel v5.18 the vDSO for signal trampoline was added.
This code mimiks the bare minimum of this vDSO and thus avoids that the
parisc emulation needs executable stacks.

Signed-off-by: Helge Deller <deller@gmx.de>
Message-Id: <20220924114501.21767-4-deller@gmx.de>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Helge Deller 2022-09-24 13:44:57 +02:00 • committed by Laurent Vivier
parent 785783bab1
commit 47393189ce
2 changed files with 32 additions and 23 deletions
Download patch file Download diff file Expand all files Collapse all files

14
linux-user/hppa/target_signal.h
View file

@ -70,18 +70,6 @@ typedef struct target_sigaltstack {
/* mask for all SS_xxx flags */
#define TARGET_SS_FLAG_BITS TARGET_SS_AUTODISARM
/*
* We cannot use a bare sigtramp page for hppa-linux.
*
* Unlike other guests where we use the instructions at PC to validate
* an offset from SP, the hppa libgcc signal frame fallback unwinding uses
* the PC address itself to find the frame. This is due to the fact that
* the hppa grows the stack upward, and the frame is of unknown size.
*
* TODO: We should be able to use a VDSO to address this, by providing
* proper unwind info for the sigtramp code, at which point the fallback
* unwinder will not be used.
*/
#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 0
#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1
#endif /* HPPA_TARGET_SIGNAL_H */