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Merge pull request #32 from rlcamp/master 

Adjusted location within ucontext of saved/restored FP regs for compat
arm_linker_fix
Ariadne Conill 2021-07-31 13:38:54 -05:00 committed by GitHub
parent 14d9859c00 1e37bf30f9
commit b1b4fe9665
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 17 additions and 15 deletions
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2
arch/aarch64/defs.h
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@ -9,7 +9,7 @@
#define SP_OFFSET 432
#define PC_OFFSET 440
#define PSTATE_OFFSET 448
#define D8_OFFSET 456
#define FPSIMD_CONTEXT_OFFSET 464
#ifndef FPSIMD_MAGIC
# define FPSIMD_MAGIC 0x46508001

9
arch/aarch64/getcontext.S
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@ -50,10 +50,11 @@ PROC_NAME(libucontext_getcontext):
/* save pstate */
str xzr, [x0, #PSTATE_OFFSET]
stp d8, d9, [x0, #D8_OFFSET + 0]
stp d10, d11, [x0, #D8_OFFSET + 16]
stp d12, d13, [x0, #D8_OFFSET + 32]
stp d14, d15, [x0, #D8_OFFSET + 48]
add x2, x0, #FPSIMD_CONTEXT_OFFSET
stp q8, q9, [x2, #144]
stp q10, q11, [x2, #176]
stp q12, q13, [x2, #208]
stp q14, q15, [x2, #240]
mov x0, #0
ret

3
arch/aarch64/include/libucontext/bits.h
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@ -14,8 +14,7 @@ typedef struct sigcontext {
unsigned long fault_address;
unsigned long regs[31];
unsigned long sp, pc, pstate;
unsigned long d8_through_d15[8];
long double __reserved[252];
long double __reserved[256];
} libucontext_mcontext_t;
typedef struct {

9
arch/aarch64/setcontext.S
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@ -33,10 +33,11 @@ PROC_NAME(libucontext_setcontext):
ldr x2, [x0, #SP_OFFSET]
mov sp, x2
ldp d8, d9, [x0, #D8_OFFSET + 0]
ldp d10, d11, [x0, #D8_OFFSET + 16]
ldp d12, d13, [x0, #D8_OFFSET + 32]
ldp d14, d15, [x0, #D8_OFFSET + 48]
add x2, x0, #FPSIMD_CONTEXT_OFFSET
ldp q8, q9, [x2, #144]
ldp q10, q11, [x2, #176]
ldp q12, q13, [x2, #208]
ldp q14, q15, [x2, #240]
/* save current program counter in link register */
ldr x16, [x0, #PC_OFFSET]

9
arch/aarch64/swapcontext.S
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@ -49,10 +49,11 @@ PROC_NAME(libucontext_swapcontext):
/* save pstate */
str xzr, [x0, #PSTATE_OFFSET]
stp d8, d9, [x0, #D8_OFFSET + 0]
stp d10, d11, [x0, #D8_OFFSET + 16]
stp d12, d13, [x0, #D8_OFFSET + 32]
stp d14, d15, [x0, #D8_OFFSET + 48]
add x2, x0, #FPSIMD_CONTEXT_OFFSET
stp q8, q9, [x2, #144]
stp q10, q11, [x2, #176]
stp q12, q13, [x2, #208]
stp q14, q15, [x2, #240]
/* context to swap to is in x1 so... we move to x0 and call setcontext */
/* store our link register in x28 */