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linux-user/arm: Add vdso

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Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
2021-07-06 09:55:12 -07:00
parent ee95fae075
commit a9f495b93f
9 changed files with 310 additions and 21 deletions
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55
linux-user/arm/signal.c
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@ -21,6 +21,7 @@
#include "user-internals.h"
#include "signal-common.h"
#include "linux-user/trace.h"
#include "vdso-asmoffset.h"
struct target_sigcontext {
abi_ulong trap_no;
@ -102,6 +103,11 @@ struct rt_sigframe
struct sigframe sig;
};
QEMU_BUILD_BUG_ON(offsetof(struct sigframe, retcode[3])
!= SIGFRAME_RC3_OFFSET);
QEMU_BUILD_BUG_ON(offsetof(struct rt_sigframe, sig.retcode[3])
!= RT_SIGFRAME_RC3_OFFSET);
static abi_ptr sigreturn_fdpic_tramp;
/*
@ -160,6 +166,9 @@ get_sigframe(struct target_sigaction *ka, CPUARMState *regs, int framesize)
return (sp - framesize) & ~7;
}
static void write_arm_sigreturn(uint32_t *rc, int syscall);
static void write_arm_fdpic_sigreturn(uint32_t *rc, int ofs);
static int
setup_return(CPUARMState *env, struct target_sigaction *ka, int usig,
struct sigframe *frame, abi_ulong sp_addr)
@ -167,9 +176,9 @@ setup_return(CPUARMState *env, struct target_sigaction *ka, int usig,
abi_ulong handler = 0;
abi_ulong handler_fdpic_GOT = 0;
abi_ulong retcode;
int thumb, retcode_idx;
int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
bool copy_retcode;
bool is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info);
bool is_rt = ka->sa_flags & TARGET_SA_SIGINFO;
bool thumb;
if (is_fdpic) {
/* In FDPIC mode, ka->_sa_handler points to a function
@ -184,9 +193,7 @@ setup_return(CPUARMState *env, struct target_sigaction *ka, int usig,
} else {
handler = ka->_sa_handler;
}
thumb = handler & 1;
retcode_idx = thumb + (ka->sa_flags & TARGET_SA_SIGINFO ? 2 : 0);
uint32_t cpsr = cpsr_read(env);
@ -202,24 +209,32 @@ setup_return(CPUARMState *env, struct target_sigaction *ka, int usig,
cpsr &= ~CPSR_E;
}
if (ka->sa_flags & TARGET_SA_RESTORER) {
if (is_fdpic) {
__put_user((abi_ulong)ka->sa_restorer, &frame->retcode[3]);
retcode = (sigreturn_fdpic_tramp +
retcode_idx * RETCODE_BYTES + thumb);
copy_retcode = true;
} else {
retcode = ka->sa_restorer;
copy_retcode = false;
}
/* Our vdso default_sigreturn label is a table of entry points. */
retcode = default_sigreturn + (is_fdpic * 2 + is_rt) * 8;
/*
* Put the sigreturn code on the stack no matter which return
* mechanism we use in order to remain ABI compliant.
* Because this is about ABI, always use the A32 instructions,
* despite the fact that our actual vdso trampoline is T16.
*/
if (is_fdpic) {
write_arm_fdpic_sigreturn(frame->retcode,
is_rt ? RT_SIGFRAME_RC3_OFFSET
: SIGFRAME_RC3_OFFSET);
} else {
retcode = default_sigreturn + retcode_idx * RETCODE_BYTES + thumb;
copy_retcode = true;
write_arm_sigreturn(frame->retcode,
is_rt ? TARGET_NR_rt_sigreturn
: TARGET_NR_sigreturn);
}
/* Copy the code to the stack slot for ABI compatibility. */
if (copy_retcode) {
memcpy(frame->retcode, g2h_untagged(retcode & ~1), RETCODE_BYTES);
if (ka->sa_flags & TARGET_SA_RESTORER) {
if (is_fdpic) {
/* Place the function descriptor in slot 3. */
__put_user((abi_ulong)ka->sa_restorer, &frame->retcode[3]);
} else {
retcode = ka->sa_restorer;
}
}
env->regs[0] = usig;